Williamson County Texas (Historic Districts) has 9 places on the National Register of Historic Places including 1 place of Statewide significance. Significant places include Williamson County Courthouse Historical District, Bartlett Commercial Historic District, Belford Historic District, Round Rock Commercial Historic District and Taylor Downtown Historic District.
Some of the country's most noteable architects helped create the Williamson County places including Henry Struve, James Wetmore, Charles S. Belford and Robert Hyer. Prominent architectural styles found in Williamson Country are Colonial Revival, Italianate and Late Victorian.