When the area that is now Garfield was first developed in 1873, it was known as East Passaic. In 1881, the community's name was changed to Garfield in honor of President of the United States James Garfield. There are generally two explanations given for the new moniker. According to one, shortly after Garfield was elected to the presidency the founder of East Passaic said, "tell everyone...don’t speak of East Passaic anymore; call it 'Garfield' after the man who will lead this great country to prosperity." Seven months later, President Garfield was assassinated but his name remained with the community. The second theory holds that after Garfield's death in 1881, a new train station was named in his honor, which in turn led to the surrounding area becoming associated with his name as well.
Garfield was originally incorporated as a borough on March 15, 1898, from portions of Saddle River Township and Wallington. At the time, the New Jersey Legislature set Garfield's boundaries as they exist today. On April 19, 1917, the borough became the City of Garfield, based on the results of a referendum held two days earlier.
As of the census of 2000, there were 29,786 people, 11,250 households, and 7,425 families residing in the city. The population density was 13,976.0 people per square mile (5,399.3/km²). There were 11,698 housing units at an average density of 5,488.8/sq mi (2,120.5/km²). The racial makeup of the city was 82.11% White, 2.98% African American, 0.33% Native American, 2.69% Asian, 0.01% Pacific Islander, 8.10% from other races, and 3.79% from two or more races. Hispanic or Latino of any race were 20.11% of the population.
There were 11,250 households out of which 30.5% had children under the age of 18 living with them, 46.5% were married couples living together, 13.8% had a female householder with no husband present, and 34.0% were non-families. 27.4% of all households were made up of individuals and 12.2% had someone living alone who was 65 years of age or older. The average household size was 2.64 and the average family size was 3.26.
In the city the population was spread out with 22.4% under the age of 18, 9.6% from 18 to 24, 33.2% from 25 to 44, 20.8% from 45 to 64, and 14.1% who were 65 years of age or older. The median age was 36 years. For every 100 females there were 95.0 males. For every 100 females age 18 and over, there were 92.0 males.
The median income for a household in the city was $42,748, and the median income for a family was $51,654. Males had a median income of $35,987 versus $26,896 for females. The per capita income for the city was $19,530. About 6.4% of families and 7.8% of the population were below the poverty line, including 9.1% of those under age 18 and 8.1% of those age 65 or over.
As of the 2000 Census, 22.9% of Garfield's population was listed as being of Polish ancestry, ranked third highest in New Jersey behind Manville (23.1%) and Wallington (45.5%).
Garfield Station is served by the New Jersey Transit's Bergen County Line, as is the Plauderville station, located on the Saddle Brook border.
New Jersey Transit buses includes lines 160 and 161 serving the Port Authority Bus Terminal in Midtown Manhattan, and local service on the, 702, 707, 709 and 758 routes.
U.S. Route 46 and County Route 507 pass through Garfield. Other main roads include Midland Avenue, Outwater Lane, and Passaic Street.