There are twenty-four municipalities within the boundaries of Sussex County in the state of New Jersey. These include one municipality incorporated as a town, eight incorporated as boroughs, and fifteen incorporated as townships, organized in accordance with state law. In 2010 Federal decennial census, 149,265 persons resided in Sussex County, a gain of 3.5% from the 144,166 persons counted in the 2000 Federal decennial census. Populations, as of 2010, range from the county's largest municipality, Vernon Township, with 23,943 residents, to Walpack Township, with 16 residents. In size, municipalities range from Branchville borough, the smallest at 0.6 square miles (1.6 km2) to the largest, Vernon, at 70.59 square miles (182.8 km2).