Mansfield is a borough located in southern Tioga County, Pennsylvania, in the Tioga River valley. It is situated at the intersection of U.S. Route 6 and U.S. Business Route 15, about 36 miles (58 km) southwest of Elmira, New York. In 1800, an English settler from Rhode Island named Asa Mann cleared a large amount of forest, and in 1804 laid out the plan for a town on this estate—Mann's field. The borough was incorporated in 1857. In the same year, the Mansfield Classical Seminary was founded, which became a state normal school in 1862 and is today Mansfield University of Pennsylvania. Mansfield claims to be the place where the first night football game was played under electric lights, on September 28, 1892. It sponsors an annual festival which celebrates the 1890s. The number of people living here in 1900 amounted to 1,847, and in 1910, 1,654. The population was 3,411 at the 2000 census. As of 2004, the borough had a population of 3,463