High Quality Content by WIKIPEDIA articles! 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 (-1.0%) from the 9,835 counted in the 1990 Census.