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The city originated from a Dutch settlement on the Passaic River established in 1679 which was called Acquackanonk. Industrial growth began in the 19th century, as Passaic became a textile and metalworking center.

A commercial center formed around a wharf ("landing") at the foot of present-day Main Avenue. This came to be commonly known as Acquackanonk Landing, and the settlement that grew around it became known as the Village of Acquackanonk Landing or simply Acquackanonk Landing Settlement. In 1854 Alfred Speer (later owner of the city's first newspaper and public hall) and Judge Henry Simmons were principals in a political battle over the naming of village. Simmons wished to keep the old name, while Speer wished to simplify it to Passaic Village. Speer was losing the battle, but convinced the U.S. Postmaster General to adopt the name, and hung a Passaic sign at the local railroad depot. The de facto name change was effective.

Legally, Passaic was formed as an unincorporated village within Acquackanonk Township (now Clifton) on March 10, 1869. It was then incorporated as an independent village on March 21, 1871. Passaic was chartered as a city on April 2, 1873.

The Okonite company owned an industrial site here from 1878 to 1993. It was the company's headquarters and primary manufacturing plant for most of the company's history. Early uses of the company's insulated wires include some of the earliest telegraph cables, and the wiring for Thomas Edison's first generating plant, Pearl Street Station in Lower Manhattan. The property was then turned into a furniture factory, whose owners redeveloped into an upscale mall, Contempo Plaza, in 2015.

The 1926 Passaic Textile Strike led by union organizer Albert Weisbord saw 36,000 mill workers leave their jobs to oppose wage cuts demanded by the textile industry. The workers successfully fought to keep their wages unchanged but did not receive recognition of their union by the mill owners.

Passaic has been called "The Birthplace of Television". In 1931, experimental television station W2XCD began transmitting from DeForest Radio Corporation in Passaic. It has been called the first television station to transmit to the home, and was the first such station to broadcast a feature film. Allen B. DuMont, formerly DeForest's chief engineer, opened pioneering TV manufacturer DuMont Laboratories in Passaic in 1937, and started the DuMont Television Network, the world's first commercial television network, in 1946.

In 1992, the voters of Passaic Township in Morris County voted to change the name of their municipality to Long Hill Township, to avoid confusion between the City of Passaic and the largely rural community 22 miles (35 km) away, as well as association with the more urban city.

Passaic is served by two regional newspapers, The Record and Herald News, both owned by Gannett company and predecessor North Jersey media Group.

The city previously had many of its own newspaper companies, among them Speer's The Passaic Item (1870-1904), the Passaic City Herald (1872-1899), the Passaic Daily Times (1882-1887), the Passaic City Record (1890-1907), the Passaic Daily News (1891-1929), the Passaic Daily Herald (1899-1929), and the Passaic Herald News (1932-1987). The Passaic Herald News went through several mergers with other Passaic County newspapers to become the current Herald News.

Among the speakers of Polish in Passaic are many Gorals.

Passaic, with over 20 synagogues and an Orthodox Jewish population of 15,000, has one of the largest Orthodox Jewish communities in New Jersey, along with the townships of Lakewood and Teaneck.

The 2010 United States Census counted 69,781 people, 19,411 households, and 14,597 families in the city. The population density was 22,179.6 per square mile (8,563.6/km²). There were 20,432 housing units at an average density of 6,494.2 per square mile (2,507.4/km²). The racial makeup was 45.06% (31,440) White, 10.64% (7,425) Black or African American, 1.07% (745) Native American, 4.36% (3,040) Asian, 0.04% (27) Pacific Islander, 33.37% (23,284) from other races, and 5.47% (3,820) from two or more races. Hispanic or Latino of any race were 71.02% (49,557) of the population. The city's Hispanic population represented the fourth-highest percentage among municipalities in New Jersey as of the 2010 Census.

Of the 19,411 households, 42.8% had children under the age of 18; 41.7% were married couples living together; 23.7% had a female householder with no husband present and 24.8% were non-families. Of all households, 19.5% were made up of individuals and 7.3% had someone living alone who was 65 years of age or older. The average household size was 3.57 and the average family size was 4.02.

31.5% of the population were under the age of 18, 11.4% from 18 to 24, 29.8% from 25 to 44, 19.6% from 45 to 64, and 7.7% who were 65 years of age or older. The median age was 29.2 years. For every 100 females, the population had 100.9 males. For every 100 females ages 18 and older there were 99.2 males.

The Census Bureau's 2006–2010 American Community Survey showed that (in 2010 inflation-adjusted dollars) median household income was $31,135 (with a margin of error of +/− $1,280) and the median family income was $34,934 (+/− $2,987). Males had a median income of $30,299 (+/− $1,883) versus $25,406 (+/− $2,456) for females. The per capita income for the city was $14,424 (+/− $581). About 25.0% of families and 27.5% of the population were below the poverty line, including 35.9% of those under age 18 and 25.5% of those age 65 or over.

Same-sex couples headed 107 households in 2010, a decline from the 142 counted in 2000.

As of the 2000 United States Census there were 67,861 people, 19,458 households, and 14,457 families residing in the city of Passaic, New Jersey. The population density was 21,804.7 people per square mile (8,424.8/km²). There were 20,194 housing units at an average density of 6,488.6 per square mile (2,507.1/km²). The racial makeup of the city was 35.43% White, 13.83% African American, 0.78% Native American, 5.51% Asian, 0.04% Pacific Islander, 39.36% from other races, and 5.04% from two or more races. The cultural groupings for Hispanic or Latino of any race were 62.46% of the population. As of the 2000 Census, 59.3% of residents spoke Spanish at home, while 28.9% of residents identified themselves as speaking only English at home. An additional 2.5% were speakers of Gujarati and 2.4% spoke Polish. There were 31,101 foreign-born residents of Passaic in 2000, of which 79.4% were from Latin America, with 31.3% of foreign-born residents from Mexico and 27.2% from the Dominican Republic.

There were 19,458 households, of which 42.0% had children under the age of 18, 43.7% were married couples living together, 21.7% had a female householder with no husband present, and 25.7% were non-families. 8.2% of Passaic households were same-sex partner households. 20.3% of all households were made up of individuals, and 8.4% had someone living alone who was 65 years of age or older. The average household size was 3.46 and the average family size was 3.93.

The city population comprised 30.8% under the age of 18, 12.5% from 18 to 24, 31.6% from 25 to 44, 16.9% from 45 to 64, and 8.1% who were 65 years of age or older. The median age was 29 years. For every 100 females, there were 99.5 males. For every 100 females age 18 and over, there were 97.4 males. The median income for a household in the city was $33,594, and the median income for a family was $34,935. Males had a median income of $24,568 versus $21,352 for females. The per capita income for the city was $12,874. About 18.4% of families and 21.2% of the population were below the poverty line, including 27.6% of those under age 18 and 16.0% of those age 65 or over.