Mount Ephraim is a borough in Camden County, in the U.S. state of New Jersey. As of the 2020 United States census, the borough's population was 4,651, a decrease of 25 (−0.5%) from the 2010 census count of 4,676, which in turn reflected an increase of 181 (+4.0%) from the 4,495 counted in the 2000 census.

Camden County is a county located in the U.S. state of New Jersey. Its county seat is Camden. As of the 2020 census, the county was the state's ninth-most populous county, with a population of 523,485, its highest decennial count ever and an increase of 9,828 (+1.9%) from the 2010 census count of 513,657, which in turn reflected an increase of 4,725 (0.9%) from the 508,932 counted in the 2000 census. The county is part of the South Jersey region of the state.