Welcome to Williamson County
Williamson county is located on both the Edwards Plateau to the west, consisting of rocky terrain and hills, and Blackland Prairies in the east consisting of rich, fertile farming land. The two areas are roughly bisected by Interstate 35. It is part of the Austin-Round Rock metropolitan area. In the year 2013, the population was estimated at 441,445; the county has more than tripled with residents since 1990 when it was occupied by 140,570 residents. Its county seat is Georgetown. The county is named for Robert McAlpin Williamson (1806-1859), an editor, a patriot, a country school teacher, a lawmaker, and a Major of the first Texas Rangers, veteran of the Battle of San Jacinto.