| County : | Williamson County |
| State : | Texas (TX) |
| Land Area : | 1,118.30 sq mi |
| Water Area : | 16.14 sq mi |
| Latitude : | 30.6490296 |
| Longitude : | -97.6050692 |
| Population (2010): | 422,679 |
| Population Estimate (2012) : | 426,296 |
| Population Density : | 377.97/sq mi |
| Housing Units (2012) : | 162,773 |
| Median Household Income (2012) : | $70,849 (Texas : $51,563, USA : $53,046) |
| Median Family Income (2012) : | $81,150 (Texas : $60,621, USA : $64,585) |
| Median House Price (2012) : | $177,000 (Texas : $128,000, USA : $181,400) |
Williamson County Cities / Towns
| Austin City (790,390) | Bartlett City (1,623) | Brushy Creek (21,764) |
| Cedar Park City (48,937) | Florence City (1,136) | Georgetown City (47,400) |
| Granger City (1,419) | Hutto City (14,698) | Jarrell City (984) |
| Jollyville (16,151) | Leander City (26,521) | Liberty Hill City (967) |
| Pflugerville City (46,936) | Round Rock City (99,887) | Serenada (1,641) |
| Taylor City (15,191) | Thorndale City (1,336) | Thrall City (839) |
| Weir City (450) |
Williamson County Zip Codes
| 76511 (3,317) | 76527 (4,058) | 76530 (2,540) |
| 76537 (3,870) | 76573 (26) | 76574 (17,661) |
| 76577 (3,046) | 76578 (1,766) | 78613 (65,099) |
| 78615 (1,290) | 78621 (21,659) | 78626 (25,996) |
| 78628 (23,727) | 78633 (19,349) | 78634 (22,791) |
| 78641 (44,295) | 78642 (9,467) | 78664 (52,932) |
| 78665 (35,985) | 78681 (50,606) | 78717 (22,538) |
| 78727 (26,689) | 78728 (20,299) | 78729 (27,108) |
| 78750 (26,814) | 78759 (38,891) |