Williamson County, Texas

Williamson County
County
The Williamson County Courthouse in 2019
Flag Seal
Location within the U.S. state of Texas
Texas's location within the U.S.
Coordinates: 30°39′20″N 97°35′02″W / 30.6555°N 97.5839°W / 30.6555; -97.5839
Country	United States
State	Texas
Founded	March 13, 1848
Named for	Robert McAlpin Williamson
Seat	Georgetown
Largest city	Round Rock
Area
• Total	1,134 sq mi (2,940 km2)
• Land	1,118 sq mi (2,900 km2)
• Water	16 sq mi (40 km2)  1.4%
Population  (2020)
• Total	609,017
• Estimate  (2022)	671,418
• Density	378/sq mi (146/km2)
Time zone	UTC−6 (Central)
• Summer (DST)	UTC−5 (CDT)
Congressional districts	10th, 17th, 31st, 37th
Website	www.wilcotx.gov

Williamson County (sometimes abbreviated as "Wilco")^[1] is a county in the U.S. state of Texas. As of the 2020 census, its population was 609,017.^[2] Its county seat is Georgetown.^[3] The county is named for Robert McAlpin Williamson (c. 1804–1859), a community leader and a veteran of the Battle of San Jacinto.^[4]

Williamson County is part of the Austin-Round Rock-Georgetown metropolitan statistical area. It was included with Austin in the Best Cities to Live in for 2009 by the Milken Institute.^[5] Located in Central Texas, it is on both the Edwards Plateau to the west, rocky terrain and hills, and Texas Blackland Prairies in the east, rich, fertile farming land. The two areas are roughly bisected by Interstate 35.