Somerdale is a borough in Camden County, New Jersey, United States. As of the 2010 United States Census, the borough's population was 5,151, reflecting a decline of 41 (-0.8%) from the 5,192 counted in the 2000 Census, which had in turn declined by 248 (-4.6%) from the 5,440 counted in the 1990 Census.
The Borough of Somerdale was created on April 23, 1929, from portions of Clementon Township, one of seven municipalities created from the now-defunct township, and one of five new municipalities (including Hi-Nella Borough, Lindenwold Borough, Pine Hill Borough and Pine Valley Borough) created on that same date.
According to the United States Census Bureau, the borough had a total area of 1.387 square miles (3.592 km2), all of which was land.
Somerdale borders the Camden County municipalities of Cherry Hill, Gloucester Township, Hi-Nella, Lawnside, Lindenwold, Magnolia, Stratford, Voorhees Township.
The 2010 United States Census counted 5,151 people, 2,026 households, and 1,345.264 families in the borough. The population density was 3,714.0 per square mile (1,434.0/km2). There were 2,158 housing units at an average density of 1,556.0 per square mile (600.8/km2). The racial makeup of the borough was 68.20% (3,513) White, 18.99% (978) Black or African American, 0.08% (4) Native American, 6.00% (309) Asian, 0.02% (1) Pacific Islander, 3.07% (158) from other races, and 3.65% (188) from two or more races. Hispanic or Latino of any race were 8.19% (422) of the population.
The 2,026 households accounted 25.3% with children under the age of 18 living with them; 47.0% were married couples living together; 14.1% had a female householder with no husband present, and 33.6% were non-families. Of all households, 27.3% were made up of individuals, and 9.9% had someone living alone who was 65 years of age or older. The average household size was 2.54 and the average family size was 3.11.
In the borough, the population age was spread out with 20.6% under the age of 18, 8.0% from 18 to 24, 27.1% from 25 to 44, 29.0% from 45 to 64, and 15.3% who were 65 years of age or older. The median age was 41.1 years. For every 100 females, the population had 97.5 males.