what county burlington, nj
Burlington, New Jersey. For the township, see Burlington Township, New Jersey. Burlington is a city in Burlington County, New Jersey, United States and a suburb of Philadelphia. As of the 2010 United States Census, the city's population was 9,920, reflecting an increase of 184 (+1.9%) from the 9,736 counted in the 2000 Census, which had in turn declined by 99 (â1.0%) from the 9,835 counted in the 1990 Census.