austin_texas | ispartof | texas <tsp> texas | largestcity | houston <tsp> texas | language | spanish_language <tsp> austin_texas | ispartof | williamson_county_texas <tsp> williamson_county_texas | countyseat | georgetown_texas <sep> austin is the capital city of the us state of texas, as well as the seat and largest city of travis county, with portions extending into hays and williamson counties incorporated on december 27, 1839, it is the 10th-most-populous city in the united states, the fourth-most-populous city in texas, and the second-most-populous state capital city it has been one of the fastest growing large cities in the united states since 2010  downtown austin and downtown san antonio are approximately 80 miles (129 km) apart, and both fall along the interstate 35 corridor 
austin is part of williamson county in texas which has the county seat of georgetown. the largest city in texas . which uses the spanish language. is houston.austin is the capital city of the u.s. state of texas and the fourth-most populous city in texas