Sherman is a city in and the county seat of Grayson County, Texas, United States. The city's estimated population as of 2009 was 38,407. It is also one of two principal cities in the Sherman-Denison Metropolitan Statistical Area. Sherman was originally located at the Center of the county, but in 1848 it was moved about three miles (5km) east to its current location. By 1850, Sherman had become an incorporated town under Texas law. It had also become a stop on the Butterfield Overland Mail route through Texas. By 1852, Sherman had a population of 300. It consisted of a public square with a log court house, and several business, a district clerk's office, and a church along the east side of the square.