Collingswood was incorporated as a borough by an Act of the New Jersey Legislature on May 22, 1888, from portions of Haddon Township, based on the results of a referendum held that same day.
The Borough does not license any establishments to serve or sell alcoholic beverages inside borough limits, a policy that dates back to 1873.
As of the census of 2000, there were 14,326 people, 6,263 households, and 3,463 families residing in the borough. The population density was 7,835.2 people per square mile (3,022.6/km). There were 6,866 housing units at an average density of 3,755.2/sq mi (1,448.6/km). The racial makeup of the borough was 86.47% White, 6.67% African American, 0.34% Native American, 2.76% Asian, 0.02% Pacific Islander, 2.42% from other races, and 1.33% from two or more races. Hispanic or Latino of any race were 5.67% of the population.
There were 6,263 households out of which 25.6% had children under the age of 18 living with them, 38.2% were married couples living together, 13.1% had a female householder with no husband present, and 44.7% were non-families. 36.6% of all households were made up of individuals and 14.0% had someone living alone who was 65 years of age or older. The average household size was 2.27 and the average family size was 3.05.
In the borough the population was spread out with 21.8% under the age of 18, 8.6% from 18 to 24, 32.9% from 25 to 44, 22.3% from 45 to 64, and 14.4% who were 65 years of age or older. The median age was 37 years. For every 100 females there were 88.6 males. For every 100 females age 18 and over, there were 85.8 males.
The median income for a household in the borough was $43,175, and the median income for a family was $57,987. Males had a median income of $40,423 versus $30,877 for females. The per capita income for the borough was $24,358. About 3.8% of families and 6.1% of the population were below the poverty line, including 6.8% of those under age 18 and 7.2% of those age 65 or over.
The Collingswood PATCO Speedline Park and Ride station links the town to Philadelphia by elevated rail. Collingswood is also served by New Jersey Transit bus route 403 to Philadelphia and local routes 450 and 451.