Mount Holly Township is a township and the county seat of Burlington County, New Jersey, United States as well as an eastern suburb of Philadelphia. As of the 2010 United States Census, the township population was 9,536, reflecting a decline of 1,192 (-11.1%) from the 10,728 counted in the 2000 Census, which had in turn increased by 89 (+0.8%) from the 10,639 counted in the 1990 Census. It is the county seat of Burlington County. Mount Holly is also home to the National Weather Service's Weather Forecast Office for Philadelphia / Mount Holly.