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. The population declined by 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.
What is now Mount Holly was originally formed as Northampton on November 6, 1688. Northampton was incorporated as one of New Jersey’s initial 104 townships by an Act of the New Jersey Legislature on February 21, 1798. Portions of the township were taken to form Little Egg Harbor Township (February 13, 1740, now part of Ocean County), Washington Township (November 19, 1802), Pemberton borough (December 15, 1826), Coaxen Township (March 10, 1845, now known as Southampton Township), Pemberton Township (March 10, 1846), Westampton Township (March 6, 1850) and Lumberton Township (March 14, 1860). The township was renamed Mount Holly as of November 6, 1931, based on the results of a referendum held three days earlier.