Cities and Towns in Williamson County, Texas
Founded in 1848, Williamson County is one of 254 counties in the state of Texas. Historically, Williamson County was formed from Milam County. The city of Georgetown is the county seat. With FIPS code of 491, Williamson County has a population of 643,026 and area of 1,124 square miles (2,911 km²).
List of all cities in Williamson County, TX alphabetically
| City/Town | Postal Code | Area Code |
| Andice, TX | 78628 | 512/737 |
| Austin, TX | 78717 | 512/737 |
| 78729 | 512/737 | |
| Beyersville, TX | 78615 | 512/737 |
| Brushy Creek, TX | 78717 | 512/737 |
| Cedar Park, TX | 78613 | 512/737 |
| 78630 | 512/737 | |
| Coupland, TX | 78615 | 512/737 |
| Dell Computers, TX | 78682 | 512/737 |
| Florence, TX | 76527 | 254 |
| Frame Switch, TX | 76574 | 512/737 |
| Friendship, TX | 76530 | 512/737 |
| Georgetown, TX | 78626 | 512/737 |
| 78627 | 512/737 | |
| 78628 | 512/737 | |
| 78633 | 830 | |
| Granger, TX | 76530 | 512/737 |
| Hare, TX | 76574 | 512/737 |
| Hoxie, TX | 76574 | 512/737 |
| Hutto, TX | 78634 | 512/737 |
| Jarrell, TX | 76537 | 512/737 |
| Jollyville, TX | 78729 | 512/737 |
| Jonah, TX | 78626 | 512/737 |
| Laneport, TX | 76574 | 512/737 |
| Leander, TX | 78641 | 512/737 |
| Leander, TX | 78646 | 512/737 |
| Liberty Hill, TX | 78642 | 512/737 |
| Monadale, TX | 78634 | 512/737 |
| New Corn Hill, TX | 76537 | 512/737 |
| Noack, TX | 76574 | 512/737 |
| Normans Crossing, TX | 76574 | 512/737 |
| Old Round Rock, TX | 78664 | 512/737 |
| Rices Crossing, TX | 76574 | 512/737 |
| Round Rock, TX | 78664 | 512/737 |
| 78665 | 512/737 | |
| 78680 | 512/737 | |
| 78681 | 512/737 | |
| 78682 | 512/737 | |
| 78683 | 512/737 | |
| Sandoval, TX | 76574 | 512/737 |
| Schwertner, TX | 76573 | 254 |
| Sun City, TX | 78628 | 512/737 |
| Taylor, TX | 76574 | 512/737 |
| Theon, TX | 76537 | 512/737 |
| Thrall, TX | 76578 | 512/737 |
| Three Point, TX | 78664 | 512/737 |
| Volente, TX | 78641 | 512/737 |
| Walburg, TX | 78673 | 512/737 |
| Waterloo, TX | 76574 | 512/737 |
| Weir, TX | 78674 | 512/737 |
| Whitestone, TX | 78641 | 512/737 |
