Prospect Park is a borough in Passaic County, New Jersey, United States. As of the 2010 United States Census, the borough's population was 5,865, reflecting an increase of 86 (+1.5%) from the 5,779 counted in the 2000 Census, which had in turn increased by 726 (+14.4%) from the 5,053 counted in the 1990 Census.
The borough of Prospect Park was formed by an act of the New Jersey Legislature on March 13, 1901, from portions of the now-defunct Manchester Township. The borough was named for Prospect Park, Brooklyn.
It is a dry town, where alcohol cannot be sold, as affirmed by an ordinance passed in 1978.
According to the United States Census Bureau, Prospect Park borough had a total area of 0.478 square miles (1.238 km2), including 0.475 square miles (1.230 km2) of land and 0.003 square miles (0.008 km2) of water (0.61%).
The borough borders the Passaic County municipalities of Haledon, Hawthorne, North Haledon and Paterson.
The 2010 United States Census counted 5,865 people, 1,797 households, and 1,455.570 families in the borough. The population density was 12,347.2 per square mile (4,767.3/km2). There were 1,931 housing units at an average density of 4,065.2 per square mile (1,569.6/km2). The racial makeup was 51.07% (2,995) White, 19.86% (1,165) Black or African American, 1.50% (88) Native American, 3.21% (188) Asian, 0.10% (6) Pacific Islander, 18.21% (1,068) from other races, and 6.05% (355) from two or more races. Hispanic or Latino of any race were 52.09% (3,055) of the population.
Of the 1,797 households, 43.6% had children under the age of 18; 47.6% were married couples living together; 26.4% had a female householder with no husband present and 19.0% were non-families. Of all households, 14.7% were made up of individuals and 4.7% had someone living alone who was 65 years of age or older. The average household size was 3.26 and the average family size was 3.59.
28.4% of the population were under the age of 18, 10.9% from 18 to 24, 29.9% from 25 to 44, 22.6% from 45 to 64, and 8.2% who were 65 years of age or older. The median age was 31.7 years.