Williamson County, TX ZIP Codes
24 ZIP codes cover all or part of Williamson County, Texas. The Census Bureau counts 672,688 residents in the county, with a median household income of $111,340 and a median home value of $447,000. Median household income ranges from $69,286 in 76511 to $145,325 in 78717. Its largest communities include Austin, Round Rock, Georgetown, Cedar Park and Leander.
Williamson County (Census county figures)
| Measure | Census figure |
|---|---|
| Residents | 672,688 |
| Households | 252,323 |
| Median household income | $111,340 |
| Median home value | $447,000 |
| Median age | 37.3 |
| Median rent | $1,796 |
All 24 ZIP codes together
| Measure | Value |
|---|---|
| Residents (sum of ZIP codes) | 780,219 |
| Households (sum of ZIP codes) | 294,228 |
| Median household income, range across ZIP codes | $69,286 (76511) to $145,325 (78717) |
| Household-weighted average of ZIP medians (an approximation, not a true median) | $114,629 |
| Homeowners | 66.6% |
| Households with kids under 18 | 36.7% |
| Moved in the past year | 15.6% |
| Carrier routes in EDDM2GO's route library | 421 routes, 360,337 homes (22 of 24 ZIP codes) |
Top facts
- Highest median household income in Williamson County: 78717 ($145,325)
- Most residents: 78641 (99,865 people)
- Highest homeownership: 78633 (91.7% own their home)
- Most households with kids: 78642 (50.0% of households)
- Most new movers: 78665 (22.8% moved in last year)
- Youngest median age: 76537 (31.1 years)
- Highest median home value: 78717 ($652,200)
Every ZIP code in Williamson County
| ZIP | Mailing city | Residents | Households | Median income | Home value | Homeowners | With kids | New movers | Carrier routes | Mailboxes | Why listed |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 78641 | Leander | 99,865 | 35,410 | $135,024 | $480,400 | 77.2% | 44.0% | 16.2% | 55 | 49,331 | 37% of its land |
| 78613 | Cedar Park | 89,956 | 33,919 | $125,487 | $496,200 | 63.9% | 39.2% | 12.7% | 45 | 37,805 | 89% of its land |
| 78665 | Round Rock | 66,171 | 24,162 | $122,680 | $474,100 | 61.4% | 42.1% | 22.8% | 33 | 31,509 | 100% of its land |
| 78664 | Round Rock | 62,060 | 23,484 | $87,417 | $358,200 | 53.7% | 31.6% | 17.2% | 30 | 25,949 | 86% of its land |
| 78681 | Round Rock | 56,691 | 20,135 | $137,819 | $497,300 | 73.9% | 43.0% | 11.6% | 27 | 22,690 | 100% of its land |
| 78628 | Georgetown | 50,822 | 19,084 | $125,635 | $496,600 | 75.5% | 34.1% | 14.7% | 31 | 28,486 | 100% of its land |
| 78626 | Georgetown | 48,072 | 16,813 | $100,431 | $387,700 | 61.8% | 39.0% | 22.2% | 26 | 24,815 | 100% of its land |
| 78634 | Hutto | 46,413 | 15,808 | $114,426 | $375,200 | 78.6% | 44.9% | 13.5% | 21 | 22,656 | 100% of its land |
| 78717 | Austin | 37,262 | 14,939 | $145,325 | $652,200 | 51.3% | 40.8% | 20.9% | 18 | 18,509 | 100% of its land |
| 78729 | Austin | 30,460 | 14,500 | $86,438 | $476,200 | 38.5% | 24.9% | 17.8% | 14 | 15,550 | 88% of its land |
| 78621 | Elgin | 30,411 | 10,175 | $98,534 | $320,800 | 81.1% | 35.7% | 9.4% | 15 | 13,257 | 14% of its land |
| 78633 | Georgetown | 29,309 | 14,245 | $100,936 | $464,600 | 91.7% | 10.2% | 12.0% | 28 | 18,717 | 100% of its land |
| 78750 | Austin | 29,277 | 11,875 | $121,563 | $601,800 | 64.9% | 32.4% | 12.5% | 15 | 12,473 | 22% of its land |
| 78728 | Austin | 26,777 | 13,169 | $75,243 | $437,000 | 29.1% | 26.1% | 19.7% | 15 | 15,326 | 22% of its land |
| 78642 | Liberty Hill | 26,434 | 8,696 | $132,958 | $506,600 | 82.9% | 50.0% | 13.8% | 16 | 14,704 | 92% of its land |
| 76574 | Taylor | 20,242 | 7,752 | $78,568 | $297,500 | 76.6% | 26.8% | 10.1% | 12 | 8,978 | 100% of its land |
| 76537 | Jarrell | 16,272 | 5,448 | $98,199 | $290,900 | 79.5% | 44.8% | 15.0% | 10 | 10,336 | 100% of its land |
| 76527 | Florence | 4,918 | 1,582 | $81,574 | $345,400 | 81.6% | 37.8% | 4.4% | 3 | 1,941 | 86% of its land |
| 76511 | Bartlett | 2,702 | 920 | $69,286 | $222,900 | 84.1% | 35.0% | 10.7% | 2 | 891 | 37% of its land |
| 76530 | Granger | 2,598 | 959 | $106,250 | $288,300 | 88.8% | 31.9% | 7.4% | 2 | 1,002 | 100% of its land |
| 76578 | Thrall | 1,762 | 571 | $105,063 | $341,300 | 86.5% | 34.2% | 13.2% | 2 | 731 | 99% of its land |
| 78615 | Coupland | 1,637 | 549 | $80,938 | $441,200 | 82.9% | 40.4% | 2.7% | 1 | 678 | 64% of its land |
| 78674 | Weir | 108 | 33 | — | $47,500 | 100.0% | 27.3% | 0.0% | — | — | 100% of its land |
| 76573 | Schwertner | 0 | 0 | — | — | — | — | — | — | — | 100% of its land |
A ZIP code is listed for Williamson County when at least 10% of its land is in the county, when it holds at least 10% of the county's land, or when the county is its main county. Totals add up whole ZIP codes, including parts that cross the county line; the Census county figures above do not.
Cities and communities
- Austin — 979,539 residents · 46 ZIP codes
- Round Rock — 127,786 residents · 3 ZIP codes
- Georgetown — 85,999 residents · 3 ZIP codes
- Cedar Park — 78,301 residents · 1 ZIP code
- Leander — 74,067 residents · 2 ZIP codes
- Pflugerville — 65,971 residents · 1 ZIP code
- Hutto — 35,483 residents · 1 ZIP code
- Brushy Creek — 19,576 residents · 2 ZIP codes
- Taylor — 17,136 residents · 1 ZIP code
- Sonterra — 10,563 residents · 1 ZIP code
- Liberty Hill — 8,371 residents · 1 ZIP code
- Santa Rita Ranch — 6,586 residents · 1 ZIP code
- Jarrell — 3,295 residents · 2 ZIP codes
- Serenada — 1,444 residents · 2 ZIP codes
- Florence — 1,061 residents · 1 ZIP code
- Granger — 1,046 residents · 1 ZIP code
- Thrall — 861 residents · 1 ZIP code
- Coupland — 491 residents · 2 ZIP codes
- Weir — 434 residents · 2 ZIP codes
Metro maps
- Austin ZIP code map — 89 ZIP codes
Rankings
- Richest ZIP codes in Williamson County — 22 ZIP codes ranked
- ZIP codes with the highest home values in Williamson County — 22 ZIP codes ranked
- ZIP codes with the highest homeownership in Williamson County — 22 ZIP codes ranked
- ZIP codes with the most families with kids in Williamson County — 22 ZIP codes ranked
- ZIP codes with the most new movers in Williamson County — 22 ZIP codes ranked
- Youngest ZIP codes in Williamson County — 22 ZIP codes ranked
- Oldest ZIP codes in Williamson County — 22 ZIP codes ranked
- Fastest-growing ZIP codes in Williamson County — 21 ZIP codes ranked
EDDM service areas in Williamson County
Price a mailing to Williamson County ZIP codes
EDDM guides
Pick carrier routes on the EDDM route map
Frequently asked questions
- What ZIP codes are in Williamson County, TX?
- 78641, 78613, 78665, 78664, 78681, 78628, 78626, 78634, 78717, 78729, 78621, 78633, 78750, 78728, 78642, 76574, 76537, 76527, 76511, 76530, 76578, 78615, 78674 and 76573. Some cross the county line; the table shows each ZIP's share of land in the county.
- What is the population of Williamson County?
- 672,688 residents in 252,323 households (ACS 5-year estimates, 2020–2024).
- What is the median household income in Williamson County?
- $111,340 for the county as a whole. Its ZIP codes range from $69,286 (76511) to $145,325 (78717).
- Which Williamson County ZIP code has the highest median household income?
- 78717, at $145,325, among ZIP codes with at least 1,000 residents. See the full ranking of Williamson County ZIP codes by income.
- How many carrier routes and mailboxes are in Williamson County?
- For the 22 of 24 ZIP codes in EDDM2GO's stored route library: 421 carrier routes reaching 360,337 residential and 16,032 business mailboxes. The route map loads the rest when you search them.
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.