Frankford Township is a township in Sussex County, New Jersey, United States. As of the 2010 United States Census, the township's population was 5,565, reflecting an increase of 145 (+2.7%) from the 5,420 counted in the 2000 Census, which had in turn increased by 306 (+6.0%) from the 5,114 counted in the 1990 Census.
Frankford Township was formed on April 10, 1797, from portions of Newton Township, and was incorporated on February 21, 1798, as one of New Jersey's initial 104 townships by an Act of the New Jersey Legislature. Portions of the township were taken to form Lafayette Township and Sparta Township (both established on April 14, 1845), along with Branchville (March 9, 1898), which is completely surrounded by the township. The township was said to have been named after Frankford, a neighborhood of Philadelphia, after a visitor who hailed from that area came to help out at the rural school in the township.
Ross Corner(with a 2010 Census population of 13) is a census-designated place and unincorporated community located within Byram Township. Augusta is another unincorporated community located within the township.
Since 1976, the township has been the home of the Farm and Horse Show, which expanded after it was relocated from Branchville. The New Jersey State Fair / Sussex County Farm & Horse Show has evolved as the site of numerous activities and events throughout the year. Another large recreation area is Skylands Park, a 4,300-seat ballpark that hosts the Sussex Skyhawks of the Can-Am League starting with the 2006 baseball season.
A large outlet mall has been proposed for the intersection of U.S. Route 206, Route 15, and County Route 565 in front of Skylands Park. This mall has met a large amount of local opposition, but has been approved and is awaiting approval by the State of New Jersey.