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La Nouvelle-Orléans (New Orleans) was founded in the spring of 1718 (May 7 has become the traditional date to mark the anniversary, but the actual day is unknown) by the French Mississippi Company, under the direction of Jean-Baptiste Le Moyne de Bienville, on land inhabited by the Chitimacha. It was named for Philippe II, Duke of Orléans, who was Regent of the Kingdom of France at the time. His title came from the French city of Orléans. The French colony of Louisiana was ceded to the Spanish Empire in the 1763 Treaty of Paris, following France's defeat by Great Britain in the Seven Years' War. During the American Revolutionary War, New Orleans was an important port for smuggling aid to the American revolutionaries, and transporting military equipment and supplies up the Mississippi River. Beginning in the 1760s, Filipinos began to settle in and around New Orleans.Bernardo de Gálvez y Madrid, Count of Gálvez successfully directed a southern campaign against the British from the city in 1779.Nueva Orleans (the name of New Orleans in Spanish) remained under Spanish control until 1803, when it reverted briefly to French rule. Nearly all of the surviving 18th-century architecture of the Vieux Carré (French Quarter) dates from the Spanish period, notably excepting the Old Ursuline Convent.

As a French colony, Louisiana faced struggles with numerous Native American tribes, one of which was the Natchez in southern Mississippi. In the 1720s trouble developed between the French and the Natchez Indians that would be called the Natchez War or Natchez Revolt. Approximately 230 French colonists were killed and the young colony was burnt to the ground.

The conflict between the two parties was a direct result of Lieutenant d’Etcheparre (more commonly known as Sieur de Chépart), the commandant at the settlement near the Natchez, decided in 1729 that the Natchez Indians should surrender both their cultivated crop lands and their town of White Apple to the French. The Natchez pretended to surrender and actually worked for the French in the hunting game, but as soon as they were weaponized, they struck back and killed several men, resulting in the colonists fleeing downriver to New Orleans. The fleeing colonists sought protection from what they feared might be a colony-wide Indian raid. The Natchez, however, did not press on after their surprise attack, leaving them vulnerable enough for King Louis XV's appointed governor Jean-Baptiste Le Moyne de Bienville to reclaim the settlement.^{[citation needed]}

Relations with Louisiana's Indians, a problem inherited from Bienville, remained a concern for the next governor, Marquis de Vaudreuil. In the early 1740s traders from the Thirteen Colonies crossed into the Appalachian Mountains. The Native American tribes would now operate dependent on which of various European colonists would most benefit them. Several of these tribes and especially the Chickasaw and Choctaw would trade goods and gifts for their loyalty.

The economic issued in the colony, which continued under Vaudreuil, resulted in many raids by Native American tribes, taking advantage of the French weakness. In 1747 and 1748, the Chickasaw would raid along the east bank of the Mississippi all the way south to Baton Rouge. These raids would often force residents of French Louisiana to take refuge in New Orleans proper.^{[citation needed]}

Inability to find labor was the most pressing issue in the young colony. The colonists turned to African slaves to make their investments in Louisiana profitable. In the late 1710s the transatlantic slave trade imported enslaved Africans into the colony. This led to the biggest shipment in 1716 where several trading ships appeared with slaves as cargo to the local residents in a one-year span.^{[citation needed]}

By 1724, the large number of blacks in Louisiana prompted the institutionalizing of laws governing slavery within the colony. These laws required that slaves be baptized in the Roman Catholic faith, slaves be married in the church, and gave slaves no legal rights. The slave law formed in the 1720s is known as the Code Noir, which would bleed into the antebellum period of the American South as well. Louisiana slave culture had its own distinct Afro-Creole society that called on past cultures and the situation for slaves in the New World. Afro-Creole was present in religious beliefs and the Louisiana Creole dialect. The religion most associated with this period for was called Voodoo.

In the city of New Orleans an inspiring mixture of foreign influences created a melting pot of culture that is still celebrated today. By the end of French colonization in Louisiana, New Orleans was recognized commercially in the Atlantic world. Its inhabitants traded across the French commercial system. New Orleans was a hub for this trade both physically and culturally because it served as the exit point to the rest of the globe for the interior of the North American continent.

In one instance the French government established a chapter house of sisters in New Orleans. The Ursuline sisters after being sponsored by the Company of the Indies, founded a convent in the city in 1727. At the end of the colonial era, the Ursuline Academy maintained a house of seventy boarding and one hundred day students. Today numerous schools in New Orleans can trace their lineage from this academy.

Another notable example is the streetplan and architecture still distinguishing New Orleans today. French Louisiana had early architects in the province who were trained as military engineers and were now assigned to design government buildings. Pierre Le Blond de Tour and Adrien de Pauger, for example, planned many early fortifications, along with the street plan for the city of New Orleans. After them in the 1740s, Ignace François Broutin, as engineer-in-chief of Louisiana, reworked the architecture of New Orleans with an extensive public works program.

French policy-makers in Paris attempted to set political and economic norms for New Orleans. It acted autonomously in much of its cultural and physical aspects, but also stayed in communication with the foreign trends as well.

After the French relinquished West Louisiana to the Spanish, New Orleans merchants attempted to ignore Spanish rule and even re-institute French control on the colony. The citizens of New Orleans held a series of public meetings during 1765 to keep the populace in opposition of the establishment of Spanish rule. Anti-Spanish passions in New Orleans reached their highest level after two years of Spanish administration in Louisiana. On October 27, 1768, a mob of local residents, spiked the guns guarding New Orleans and took control of the city from the Spanish. The rebellion organized a group to sail for Paris, where it met with officials of the French government. This group brought with them a long memorial to summarize the abuses the colony had endured from the Spanish. King Louis XV and his ministers reaffirmed Spain's sovereignty over Louisiana.

Napoleon sold Louisiana (New France) to the United States in the Louisiana Purchase in 1803. Thereafter, the city grew rapidly with influxes of Americans, French, Creoles and Africans. Later immigrants were Irish, Germans, Poles and Italians. Major commodity crops of sugar and cotton were cultivated with slave labor on nearby large plantations.

Thousands of refugees from the 1804 Haitian Revolution, both whites and free people of color (affranchis or gens de couleur libres), arrived in New Orleans; a number brought their slaves with them, many of whom were native Africans or of full-blood descent. While Governor Claiborne and other officials wanted to keep out additional free black people, the French Creoles wanted to increase the French-speaking population. As more refugees were allowed into the Territory of Orleans, Haitian émigrés who had first gone to Cuba also arrived. Many of the white Francophones had been deported by officials in Cuba in retaliation for Bonapartist schemes.

Nearly 90 percent of these immigrants settled in New Orleans. The 1809 migration brought 2,731 whites, 3,102 free people of color (of mixed-race European and African descent), and 3,226 slaves of primarily African descent, doubling the city's population. The city became 63 percent black, a greater proportion than Charleston, South Carolina's 53 percent.

During the final campaign of the War of 1812, the British sent a force of 11,000 in an attempt to capture New Orleans. Despite great challenges, General Andrew Jackson, with support from the U.S. Navy, successfully cobbled together a force of militia from Louisiana and Mississippi, U.S. Army regulars, a large contingent of Tennessee state militia, Kentucky frontiersmen and local privateers (the latter led by the pirate Jean Lafitte), to decisively defeat the British, led by Sir Edward Pakenham, in the Battle of New Orleans on January 8, 1815.

The armies had not learned of the Treaty of Ghent, which had been signed on December 24, 1814 (however, the treaty did not call for cessation of hostilities until after both governments had ratified it. The U.S. government ratified it on February 16, 1815). The fighting in Louisiana had begun in December 1814 and did not end until late January, after the Americans held off the Royal Navy during a ten-day siege of Fort St. Philip (the Royal Navy went on to capture Fort Bowyer near Mobile, before the commanders received news of the peace treaty).

As a port, New Orleans played a major role during the antebellum era in the Atlantic slave trade. The port handled commodities for export from the interior and imported goods from other countries, which were warehoused and transferred in New Orleans to smaller vessels and distributed along the Mississippi River watershed. The river was filled with steamboats, flatboats and sailing ships. Despite its role in the slave trade, New Orleans at the time also had the largest and most prosperous community of free persons of color in the nation, who were often educated, middle-class property owners.

Dwarfing the other cities in the Antebellum South, New Orleans had America's largest slave market. The market expanded after the United States ended the international trade in 1808. Two-thirds of the more than one million slaves brought to the Deep South arrived via forced migration in the domestic slave trade. The money generated by the sale of slaves in the Upper South has been estimated at 15 percent of the value of the staple crop economy. The slaves were collectively valued at half a billion dollars. The trade spawned an ancillary economy—transportation, housing and clothing, fees, etc., estimated at 13.5% of the price per person, amounting to tens of billions of dollars (2005 dollars, adjusted for inflation) during the antebellum period, with New Orleans as a prime beneficiary.

According to historian Paul Lachance,

After the Louisiana Purchase, numerous Anglo-Americans migrated to the city. The population doubled in the 1830s and by 1840, New Orleans had become the nation's wealthiest and the third-most populous city, after New York and Baltimore. German and Irish immigrants began arriving in the 1840s, working as port laborers. In this period, the state legislature passed more restrictions on manumissions of slaves and virtually ended it in 1852.

In the 1850s, white Francophones remained an intact and vibrant community in New Orleans. They maintained instruction in French in two of the city's four school districts (all served white students). In 1860, the city had 13,000 free people of color (gens de couleur libres), the class of free, mostly mixed-race people that expanded in number during French and Spanish rule. They set up some private schools for their children. The census recorded 81 percent of the free people of color as mulatto, a term used to cover all degrees of mixed race. Mostly part of the Francophone group, they constituted the artisan, educated and professional class of African Americans. The mass of blacks were still enslaved, working at the port, in domestic service, in crafts, and mostly on the many large, surrounding sugarcane plantations.

After growing by 45 percent in the 1850s, by 1860, the city had nearly 170,000 people. It had grown in wealth, with a "per capita income was second in the nation and the highest in the South." The city had a role as the "primary commercial gateway for the nation's booming midsection." The port was the nation's third largest in terms of tonnage of imported goods, after Boston and New York, handling 659,000 tons in 1859.

As the Creole elite feared, the American Civil War changed their world. In April 1862, following the city's occupation by the Union Navy after the Battle of Forts Jackson and St. Philip, Northern forces occupied the city. Gen. Benjamin F. Butler, a respected Massachusetts lawyer serving in that state's militia, was appointed military governor. New Orleans residents supportive of the Confederacy nicknamed him "Beast" Butler, because of an order he issued. After his troops had been assaulted and harassed in the streets by women still loyal to the Confederate cause, his order warned that such future occurrences would result in his men treating such women as those "plying their avocation in the streets", implying that they would treat the women like prostitutes. Accounts of this spread widely. He also came to be called "Spoons" Butler because of the alleged looting that his troops did while occupying the city, during which time he himself supposedly pilfered silver flatware.^{[citation needed]}

Significantly, Butler abolished French-language instruction in city schools. Statewide measures in 1864 and, after the war, 1868 further strengthened the English-only policy imposed by federal representatives. With the predominance of English speakers, that language had already become dominant in business and government. By the end of the 19th century, French usage had faded. It was also under pressure from Irish, Italian and German immigrants. However, as late as 1902 "one-fourth of the population of the city spoke French in ordinary daily intercourse, while another two-fourths was able to understand the language perfectly," and as late as 1945, many elderly Creole women spoke no English. The last major French language newspaper, L'Abeille de la Nouvelle-Orléans (New Orleans Bee), ceased publication on December 27, 1923, after ninety-six years. According to some sources, Le Courrier de la Nouvelle Orleans continued until 1955.

As the city was captured and occupied early in the war, it was spared the destruction through warfare suffered by many other cities of the American South. The Union Army eventually extended its control north along the Mississippi River and along the coastal areas. As a result, most of the southern portion of Louisiana was originally exempted from the liberating provisions of the 1863 "Emancipation Proclamation" issued by President Abraham Lincoln. Large numbers of rural ex-slaves and some free people of color from the city volunteered for the first regiments of Black troops in the War. Led by Brigadier General Daniel Ullman (1810–1892), of the 78th Regiment of New York State Volunteers Militia, they were known as the "Corps d'Afrique." While that name had been used by a militia before the war, that group was composed of free people of color. The new group was made up mostly of former slaves. They were supplemented in the last two years of the War by newly organized United States Colored Troops, who played an increasingly important part in the war.

Violence throughout the South, especially the Memphis Riots of 1866 followed by the New Orleans Riot in the same year, led Congress to pass the Reconstruction Act and the Fourteenth Amendment, extending the protections of full citizenship to freedmen and free people of color. Louisiana and Texas were put under the authority of the "Fifth Military District" of the United States during Reconstruction. Louisiana was readmitted to the Union in 1868. Its Constitution of 1868 granted universal male suffrage and established universal public education. Both blacks and whites were elected to local and state offices. In 1872, lieutenant governor P.B.S. Pinchback, who was of mixed race, succeeded Henry Clay Warmouth for a brief period as Republican governor of Louisiana, becoming the first governor of African descent of an American state (the next African American to serve as governor of an American state was Douglas Wilder, elected in Virginia in 1989). New Orleans operated a racially integrated public school system during this period.

Wartime damage to levees and cities along the Mississippi River adversely affected southern crops and trade. The federal government contributed to restoring infrastructure. The nationwide financial recession and Panic of 1873 adversely affected businesses and slowed economic recovery.

From 1868, elections in Louisiana were marked by violence, as white insurgents tried to suppress black voting and disrupt Republican Party gatherings. The disputed 1872 gubernatorial election resulted in conflicts that ran for years. The "White League", an insurgent paramilitary group that supported the Democratic Party, was organized in 1874 and operated in the open, violently suppressing the black vote and running off Republican officeholders. In 1874, in the Battle of Liberty Place, 5,000 members of the White League fought with city police to take over the state offices for the Democratic candidate for governor, holding them for three days. By 1876, such tactics resulted in the white Democrats, the so-called Redeemers, regaining political control of the state legislature. The federal government gave up and withdrew its troops in 1877, ending Reconstruction.

White Democrats passed Jim Crow laws, establishing racial segregation in public facilities. In 1889, the legislature passed a constitutional amendment incorporating a "grandfather clause" that effectively disfranchised freedmen as well as the propertied people of color manumitted before the war. Unable to vote, African Americans could not serve on juries or in local office, and were closed out of formal politics for generations. The Southern U.S. was ruled by a white Democratic Party. Public schools were racially segregated and remained so until 1960.

New Orleans' large community of well-educated, often French-speaking free persons of color (gens de couleur libres), who had been free prior to the Civil War, fought against Jim Crow. They organized the Comité des Citoyens (Citizens Committee) to work for civil rights. As part of their legal campaign, they recruited one of their own, Homer Plessy, to test whether Louisiana's newly enacted Separate Car Act was constitutional. Plessy boarded a commuter train departing New Orleans for Covington, Louisiana, sat in the car reserved for whites only, and was arrested. The case resulting from this incident, Plessy v. Ferguson, was heard by the U.S. Supreme Court in 1896. The court ruled that "separate but equal" accommodations were constitutional, effectively upholding Jim Crow measures.

In practice, African American public schools and facilities were underfunded across the South. The Supreme Court ruling contributed to this period as the nadir of race relations in the United States. The rate of lynchings of black men was high across the South, as other states also disfranchised blacks and sought to impose Jim Crow. Nativist prejudices also surfaced. Anti-Italian sentiment in 1891 contributed to the lynchings of 11 Italians, some of whom had been acquitted of the murder of the police chief. Some were shot and killed in the jail where they were detained. It was the largest mass lynching in U.S. history. In July 1900 the city was swept by white mobs rioting after Robert Charles, a young African American, killed a policeman and temporarily escaped. The mob killed him and an estimated 20 other blacks; seven whites died in the days-long conflict, until a state militia suppressed it.

Throughout New Orleans' history, until the early 20th century when medical and scientific advances ameliorated the situation, the city suffered repeated epidemics of yellow fever and other tropical and infectious diseases.

New Orleans' economic and population zenith in relation to other American cities occurred in the antebellum period. It was the nation's fifth-largest city in 1860 (after New York, Philadelphia, Boston and Baltimore) and was significantly larger than all other southern cities. From the mid-19th century onward rapid economic growth shifted to other areas, while New Orleans' relative importance steadily declined. The growth of railways and highways decreased river traffic, diverting goods to other transportation corridors and markets. Thousands of the most ambitious people of color left the state in the Great Migration around World War II and after, many for West Coast destinations. From the late 1800s, most censuses recorded New Orleans slipping down the ranks in the list of largest American cities (New Orleans' population still continued to increase throughout the period, but at a slower rate than before the Civil War).

By the mid-20th Century, New Orleanians recognized that their city was no longer the leading urban area in the South. By 1950, Houston, Dallas, and Atlanta exceeded New Orleans in size, and in 1960 Miami eclipsed New Orleans, even as the latter's population reached its historic peak. As with other older American cities, highway construction and suburban development drew residents from the center city to newer housing outside. The 1970 census recorded the first absolute decline in population since the city became part of the United States in 1803. The Greater New Orleans metropolitan area continued expanding in population, albeit more slowly than other major Sun Belt cities. While the port remained one of the nation's largest, automation and containerization cost many jobs. The city's former role as banker to the South was supplanted by larger peer cities. New Orleans' economy had always been based more on trade and financial services than on manufacturing, but the city's relatively small manufacturing sector also shrank after World War II. Despite some economic development successes under the administrations of DeLesseps "Chep" Morrison (1946–1961) and Victor "Vic" Schiro (1961–1970), metropolitan New Orleans' growth rate consistently lagged behind more vigorous cities.

During the later years of Morrison's administration, and for the entirety of Schiro's, the city was a center of the Civil Rights Movement. The Southern Christian Leadership Conference was founded in New Orleans, and lunch counter sit-ins were held in Canal Street department stores. A prominent and violent series of confrontations occurred in 1960 when the city attempted school desegregation, following the Supreme Court ruling in Brown v. Board of Education (1954). When six-year-old Ruby Bridges integrated William Frantz Elementary School in the Ninth Ward, she was the first child of color to attend a previously all-white school in the South. Much controversy preceded the 1956 Sugar Bowl at Tulane Stadium, when the Pitt Panthers, with African-American fullback Bobby Grier on the roster, met the Georgia Tech Yellow Jackets. There had been controversy over whether Grier should be allowed to play due to his race, and whether Georgia Tech should even play at all due to Georgia's Governor Marvin Griffin's opposition to racial integration. After Griffin publicly sent a telegram to the state's Board Of Regents requesting Georgia Tech not to engage in racially integrated events, Georgia Tech's president Blake R Van Leer rejected the request and threatened to resign. The game went on as planned

The Civil Rights Movement's success in gaining federal passage of the Civil Rights Act of 1964 and the Voting Rights Act of 1965 renewed constitutional rights, including voting for blacks. Together, these resulted in the most far-reaching changes in New Orleans' 20th century history. Though legal and civil equality were re-established by the end of the 1960s, a large gap in income levels and educational attainment persisted between the city's White and African American communities. As the middle class and wealthier members of both races left the center city, its population's income level dropped, and it became proportionately more African American. From 1980, the African American majority elected primarily officials from its own community. They struggled to narrow the gap by creating conditions conducive to the economic uplift of the African American community.

New Orleans became increasingly dependent on tourism as an economic mainstay during the administrations of Sidney Barthelemy (1986–1994) and Marc Morial (1994–2002). Relatively low levels of educational attainment, high rates of household poverty, and rising crime threatened the city's prosperity in the later decades of the century. The negative effects of these socioeconomic conditions aligned poorly with the changes in the late-20th century to the economy of the United States, which reflected a post-industrial, knowledge-based paradigm in which mental skills and education were more important to advancement than manual skills.

In the 20th century, New Orleans' government and business leaders believed they needed to drain and develop outlying areas to provide for the city's expansion. The most ambitious development during this period was a drainage plan devised by engineer and inventor A. Baldwin Wood, designed to break the surrounding swamp's stranglehold on the city's geographic expansion. Until then, urban development in New Orleans was largely limited to higher ground along the natural river levees and bayous.

Wood's pump system allowed the city to drain huge tracts of swamp and marshland and expand into low-lying areas. Over the 20th century, rapid subsidence, both natural and human-induced, resulted in these newly populated areas subsiding to several feet below sea level.

New Orleans was vulnerable to flooding even before the city's footprint departed from the natural high ground near the Mississippi River. In the late 20th century, however, scientists and New Orleans residents gradually became aware of the city's increased vulnerability. In 1965, flooding from Hurricane Betsy killed dozens of residents, although the majority of the city remained dry. The rain-induced flood of May 8, 1995, demonstrated the weakness of the pumping system. After that event, measures were undertaken to dramatically upgrade pumping capacity. By the 1980s and 1990s, scientists observed that extensive, rapid, and ongoing erosion of the marshlands and swamp surrounding New Orleans, especially that related to the Mississippi River–Gulf Outlet Canal, had the unintended result of leaving the city more vulnerable than before to hurricane-induced catastrophic storm surges.

New Orleans was catastrophically affected by what Raymond B. Seed called "the worst engineering disaster in the world since Chernobyl", when the Federal levee system failed during Hurricane Katrina on August 29, 2005. By the time the hurricane approached the city on August 29, 2005, most residents had evacuated. As the hurricane passed through the Gulf Coast region, the city's federal flood protection system failed, resulting in the worst civil engineering disaster in American history. Floodwalls and levees constructed by the United States Army Corps of Engineers failed below design specifications and 80% of the city flooded. Tens of thousands of residents who had remained were rescued or otherwise made their way to shelters of last resort at the Louisiana Superdome or the New Orleans Morial Convention Center. More than 1,500 people were recorded as having died in Louisiana, most in New Orleans, while others remain unaccounted for. Before Hurricane Katrina, the city called for the first mandatory evacuation in its history, to be followed by another mandatory evacuation three years later with Hurricane Gustav.

The city was declared off-limits to residents while efforts to clean up after Hurricane Katrina began. The approach of Hurricane Rita in September 2005 caused repopulation efforts to be postponed, and the Lower Ninth Ward was reflooded by Rita's storm surge.

Because of the scale of damage, many people resettled permanently outside the area. Federal, state, and local efforts supported recovery and rebuilding in severely damaged neighborhoods. The Census Bureau in July 2006 estimated the population to be 223,000; a subsequent study estimated that 32,000 additional residents had moved to the city as of March 2007, bringing the estimated population to 255,000, approximately 56% of the pre-Katrina population level. Another estimate, based on utility usage from July 2007, estimated the population to be approximately 274,000 or 60% of the pre-Katrina population. These estimates are somewhat smaller to a third estimate, based on mail delivery records, from the Greater New Orleans Community Data Center in June 2007, which indicated that the city had regained approximately two-thirds of its pre-Katrina population. In 2008, the Census Bureau revised its population estimate for the city upward, to 336,644. Most recently, by July 2015, the population was back up to 386,617—80% of what it was in 2000.

Several major tourist events and other forms of revenue for the city have returned. Large conventions returned. College bowl games returned for the 2006–2007 season. The New Orleans Saints returned that season. The New Orleans Hornets (now named the Pelicans) returned to the city for the 2007–2008 season. New Orleans hosted the 2008 NBA All-Star Game. Additionally, the city hosted Super Bowl XLVII.

Major annual events such as Mardi Gras, Voodoo Experience, and the Jazz & Heritage Festival were never displaced or canceled. A new annual festival, "The Running of the Bulls New Orleans", was created in 2007.

On February 7, 2017, a large EF3 wedge tornado hit parts of the eastern side of the city, damaging homes and other buildings, as well as destroying a mobile home park. At least 25 people were left injured by the event.

According to the 2010 U.S. census, 343,829 people and 189,896 households lived in New Orleans. In 2019, the U.S. Census Bureau estimated New Orleans had 390,144 residents.

Beginning in 1960, the population decreased due to factors such as the cycles of oil production and tourism, and as suburbanization increased (as with many cities), and jobs migrated to surrounding parishes. This economic and population decline resulted in high levels of poverty in the city; in 1960 it had the fifth-highest poverty rate of all US cities, and was almost twice the national average in 2005, at 24.5%. New Orleans experienced an increase in residential segregation from 1900 to 1980, leaving the disproportionately African American poor in older, low-lying locations. These areas were especially susceptible to flood and storm damage.

The last population estimate before Hurricane Katrina was 454,865, as of July 1, 2005. A population analysis released in August 2007 estimated the population to be 273,000, 60% of the pre-Katrina population and an increase of about 50,000 since July 2006. A September 2007 report by The Greater New Orleans Community Data Center, which tracks population based on U.S. Postal Service figures, found that in August 2007, just over 137,000 households received mail. That compares with about 198,000 households in July 2005, representing about 70% of pre-Katrina population. More recently, the Census Bureau revised upward its 2008 population estimate for the city, to 336,644 inhabitants. In 2010, estimates showed that neighborhoods that did not flood were near or even greater than 100% of their pre-Katrina populations.

Katrina displaced 800,000 people, contributing significantly to the decline. African Americans, renters, the elderly, and people with low income were disproportionately affected by Katrina, compared to affluent and white residents. In Katrina's aftermath, city government commissioned groups such as Bring New Orleans Back Commission, the New Orleans Neighborhood Rebuilding Plan, the Unified New Orleans Plan, and the Office of Recovery Management to contribute to plans addressing depopulation. Their ideas included shrinking the city's footprint from before the storm, incorporating community voices into development plans, and creating green spaces, some of which incited controversy.

A 2006 study by researchers at Tulane University and the University of California, Berkeley determined that as many as 10,000 to 14,000 undocumented immigrants, many from Mexico, resided in New Orleans. The New Orleans Police Department began a new policy to "no longer cooperate with federal immigration enforcement" beginning on February 28, 2016.Janet Murguía, president and chief executive officer of the National Council of La Raza, stated that up to 120,000 Hispanic workers lived in New Orleans. In June 2007, one study stated that the Hispanic population had risen from 15,000, pre-Katrina, to over 50,000. From 2010 to 2014 the city grew by 12%, adding an average of more than 10,000 new residents each year following the 2010 U.S. census.

As of 2010, 90.3% of residents age 5 and older spoke English at home as a primary language, while 4.8% spoke Spanish, 1.9% Vietnamese, and 1.1% spoke French. In total, 9.7% population age 5 and older spoke a mother language other than English.

The racial and ethnic makeup of New Orleans was 60.2% African American, 33.0% White, 2.9% Asian (1.7% Vietnamese, 0.3% Indian, 0.3% Chinese, 0.1% Filipino, 0.1% Korean), 0.0% Pacific Islander, and 1.7% were people of two or more races in 2010. People of Hispanic or Latino origin made up 5.3% of the population; 1.3% were Mexican, 1.3% Honduran, 0.4% Cuban, 0.3% Puerto Rican, and 0.3% Nicaraguan. In 2018, the racial and ethnic makeup of the city was 30.6% non-Hispanic white, 59% Black or African American, 0.1% American Indian or Alaska Native, 2.9% Asian, <0.0% Pacific Islander, 0.4% from some other race, and 1.5% from two or more races. Hispanics or Latinos of any race made up 5.5% of the population in 2018.

As of 2011 the Hispanic and Latin American population had grown in the New Orleans area, including in Kenner, central Metairie, and Terrytown in Jefferson Parish and eastern New Orleans and Mid-City in New Orleans proper. Among the Asian American community, the earliest Filipino Americans to live within the city arrived in the early 1800s.

After Katrina the small Brazilian American population expanded. Portuguese speakers were the second most numerous group to take English as a second language classes in the Roman Catholic Archdiocese of New Orleans, after Spanish speakers. Many Brazilians worked in skilled trades such as tile and flooring, although fewer worked as day laborers than did Latinos. Many had moved from Brazilian communities in the northeastern United States, particularly Florida and Georgia. Brazilians settled throughout the metropolitan area. Most were undocumented. In January 2008 the New Orleans Brazilian population had a mid-range estimate of 3,000. By 2008 Brazilians had opened many small churches, shops and restaurants catering to their community.

New Orleans' colonial history of French and Spanish settlement generated a strong Roman Catholic tradition. Catholic missions ministered to slaves and free people of color and established schools for them. In addition, many late 19th and early 20th century European immigrants, such as the Irish, some Germans, and Italians were Catholic. Within the Roman Catholic Archdiocese of New Orleans (which includes not only the city but the surrounding parishes as well), 40% percent of the population is Roman Catholic. Catholicism is reflected in French and Spanish cultural traditions, including its many parochial schools, street names, architecture and festivals, including Mardi Gras.

Influenced by the Bible Belt's prominent Protestant population, New Orleans also has a sizable non-Catholic Christian demographic. Roughly 12.2% of the population are Baptist, followed by 5.1% from another Christian faith including Eastern Orthodox Christianity or Oriental Orthodoxy, 3.1% Methodism, 1.8% Episcopalianism, 0.9% Presbyterianism, 0.8% Lutheranism, 0.8% from the Latter-Day Saints, and 0.6% Pentecostalism. Of the Baptist population, the majority form the National Baptist Convention (USA and America), and the Southern Baptist Convention.

New Orleans displays a distinctive variety of Louisiana Voodoo, due in part to syncretism with African and Afro-Caribbean Roman Catholic beliefs. The fame of voodoo practitioner Marie Laveau contributed to this, as did New Orleans' Caribbean cultural influences. Although the tourism industry strongly associated Voodoo with the city, only a small number of people are serious adherents.

New Orleans was also home to the occultist Mary Oneida Toups, who was nicknamed the "Witch Queen of New Orleans". Toups' coven, The Religious Order of Witchcraft, was the first coven to be officially recognized as a religious institution by the state of Louisiana.

Jewish settlers, primarily Sephardim, settled in New Orleans from the early nineteenth century. Some migrated from the communities established in the colonial years in Charleston, South Carolina and Savannah, Georgia. The merchant Abraham Cohen Labatt helped found the first Jewish congregation in New Orleans in the 1830s, which became known as the Portuguese Jewish Nefutzot Yehudah congregation (he and some other members were Sephardic Jews, whose ancestors had lived in Portugal and Spain). Ashkenazi Jews from eastern Europe immigrated in the late 19th and 20th centuries.

By the 21st century, 10,000 Jews lived in New Orleans. This number dropped to 7,000 after Hurricane Katrina, but rose again after efforts to incentivize the community's growth resulted in the arrival of about an additional 2,000 Jews. New Orleans synagogues lost members, but most re-opened in their original locations. The exception was Congregation Beth Israel, the oldest and most prominent Orthodox synagogue in the New Orleans region. Beth Israel's building in Lakeview was destroyed by flooding. After seven years of holding services in temporary quarters, the congregation consecrated a new synagogue on land purchased from the Reform Congregation Gates of Prayer in Metairie.

A visible religious minority,Muslims constitute 0.6% of the religious population as of 2019. The Islamic demographic in New Orleans and its metropolitan area are mainly made up of Middle Eastern immigrants and African Americans.