Willingboro is a Township in Burlington County, New Jersey, United States and a suburb of Philadelphia. As of the 2010 United States Census, the township population was 31,629 reflecting a decline of 1,379 (-4.2%) from the 33,008 counted in the 2000 Census, which had in turn declined by 3,283 (-9.0%) from the 36,291 counted in the 1990 Census.