Newton is a city located in Catawba County, North Carolina. It is the county seat of Catawba County. According to the United States Census Bureau, the city has a total area of 13.0 square miles (34 sq.km), of which, 13.0 square miles (34 sq.km) of it is land and 0.04 square miles (0.10 sq.km) of it is water. The total area is 0.23% water. Newton is part of the HickoryLenoirMorganton Metropolitan Statistical Area.