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 63,716 at the 2016 Census estimate.It is 30 miles from Austin. Southwestern University, the oldest university in Texas, founded in 1840, is located in Georgetown about one-half mile from the historic square. Sun City Texas is a large retirement-oriented and age-restricted development that constitutes more than one-third of Georgetown's population.Georgetown has a notable range of Victorian commercial and residential architecture. In 1976, a local historic ordinance was passed to recognize and protect the significance of the historic central business district, and in 1977, the Williamson County Courthouse Historical District, containing some 46 contributing structures, was listed on the National Register of Historic Places.