Georgetown is a city in and the county seat of Williamson County, Texas, United States, with a population of 47,400 at the 2010 census and a population of 70,685 at the 2017 Census estimate. Georgetown is the 7th fastest growing city in the U.S as of May 14 2019.It is 30 miles (48 km) from Austin. Southwestern University, the oldest university in Texas, founded in 1840, is located in Georgetown about one-half mile from the historic square.