New Philadelphia is a city in the U.S. state of Ohio and is both the largest city in and county seat of Tuscarawas County. It is located 71 miles (114 km) south of Cleveland and 119 miles (192 km) northeast of Columbus on the Tuscarawas River. It was established in 1804. Because of the presence of coal and clay, early industry in the city centered on mining interests and the manufacturing of steel, canned goods, roofing tile, sewer pipe, bricks, vacuum cleaners, stovepipes, carriages, flour, brooms, and pressed, stamped, and enameled goods.