Trego is a town in Washburn County, Wisconsin, United States. The census-designated place of Trego is located in the town. According to the United States Census Bureau, the town has a total area of 36.8 square miles (95.2 sq. km), of which, 35.9 square miles (93.1 sq.km ) of it is land and 0.8 square miles (2.2 sq. km) of it (2.28%) is water.