Mount Ephraim is a borough in Camden County, New Jersey, United States. As of the 2010 United States Census, the borough's population was 4,676, reflecting an increase of 181 (+4.0%) from the 4,495 counted in the 2000 Census, which had in turn declined by 22 (-0.5%) from the 4,517 counted in the 1990 Census.
Mount Ephraim was incorporated as a borough by an act of the New Jersey Legislature on March 23, 1926, from portions of the now-defunct Centre Township. The boroughs of Bellmawr, Runnemede and Lawnside were simultaneously created during the same two-day period. The borough was named for Ephraim Albertson, who owned a tavern in the area in the early 1800s.
According to the United States Census Bureau, the borough had a total area of 0.900 square miles (2.332 km2), including 0.881 square miles (2.282 km2) of land and 0.019 square miles (0.050 km2) of water (2.16%).
Mount Ephraim borders Audubon, Bellmawr, Brooklawn, Gloucester City, Haddon Heights and Haddon Township.
On September 4, 2012, at 6:31 p.m., a tornado touched down in Mount Ephraim, causing damage to trees and homes in the immediate vicinity. It was categorized as F-0 by the National Weather Service, with winds topping out at 70 mph, making it the first tornado recorded in the state in more than a year.
As of the 2010 United States Census, there were 4,676 people, 1,909 households, and 1,193.125 families residing in the borough. The population density was 5,307.9 per square mile (2,049.4/km2). There were 2,010 housing units at an average density of 2,281.6 per square mile (880.9/km2). The racial makeup of the borough was 93.56% (4,375) White, 2.14% (100) Black or African American, 0.09% (4) Native American, 0.68% (32) Asian, 0.00% (0) Pacific Islander, 2.27% (106) from other races, and 1.26% (59) from two or more races. Hispanic or Latino of any race were 5.33% (249) of the population.
There were 1,909 households out of which 26.6% had children under the age of 18 living with them, 45.6% were married couples living together, 11.5% had a female householder with no husband present, and 37.5% were non-families. 31.2% of all households were made up of individuals, and 13.7% had someone living alone who was 65 years of age or older.