Georgetown is the county seat of Williamson County, Texas with a population of 47,400 at the 2010 census. Southwestern University, founded in 1840, is the oldest university in Texas and is located in Georgetown, about 1/2 mile east of the historic square. Sun City Texas (formerly called Sun City Georgetown) is a large retirement-oriented and age restricted development which constitutes more than one-third of the population of Georgetown.

The median income for a household in the city was $54,098, and the median income for a family was $63,338. Males had a median income of $40,541 versus $27,082 for females. The per capita income for the city was $24,287. About 4.4% of families and 7.2% of the population were below the poverty line, including 9.3% of those under age 18 and 3.9% of those age 65 or over.