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County · GEOID 48491

Williamson County, TX ZIP codes

27 ZIP/ZCTAs intersecting this county.

ACS 2023 population

643,889

Median household income

$108,309

Median home value

$414,600

U.S. Census Bureau, ACS 2019–2023 5-year (vintage 2023). Geography: County Williamson County (GEOID 48491). Methodology

Combined population of ZIP/ZCTAs intersecting this county: 828,790 (27 ZIPs).

Combined population of ZIP/ZCTAs intersecting this county. Each intersecting ZIP contributes its full ZCTA population; overlap percents are descriptive only. This is not the Census county ACS headline above. Methodology

Williamson County, TX ZIP code map

Census ZIP Code Tabulation Areas in Williamson County, TX
ZIP Code Tabulation Areas inside Williamson County, TX. Boundaries: U.S. Census Bureau. Methodology · Data sources
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ZIP/ZCTA overlap with Williamson County

Population overlap

Share of each ZIP/ZCTA’s population located within Williamson County, based on ZIP Code Database county-overlap data. This is a population measure, not land-area overlap or the Census county population.

ZIP Code Database county-overlap table, field percent_of_zip_population_in_county, keyed by county_geoid. Not ACS 2019–2023. Overlap vintage is the shipped overlap table and is separate from ACS. Methodology

ZIP codes intersecting Williamson County

ZIPCityCountyPopulationIncome
76511BartlettWilliamson County2,473$64,215
76527FlorenceWilliamson County4,686$83,533
76530GrangerWilliamson County2,704$102,000
76537JarrellWilliamson County12,526$96,067
76573SchwertnerWilliamson County22—
76574TaylorWilliamson County19,746$72,805
76577ThorndaleMilam County3,297$70,174
76578ThrallWilliamson County1,561$100,500
78613Cedar ParkWilliamson County89,162$120,829
78615CouplandTravis County1,540$112,805
78621ElginBastrop County27,860$88,246
78626GeorgetownWilliamson County45,020$94,967
78628GeorgetownWilliamson County44,821$117,198
78633GeorgetownWilliamson County28,877$99,967
78634HuttoWilliamson County43,466$111,227
78641LeanderWilliamson County93,399$131,421
78642Liberty HillWilliamson County24,146$128,086
78664Round RockWilliamson County62,272$85,919
78665Round RockWilliamson County64,087$117,240
78674WeirWilliamson County195$95,481
78681Round RockWilliamson County58,531$136,215
78717AustinWilliamson County36,085$140,483
78727AustinTravis County30,894$107,194
78728AustinTravis County26,776$74,048
78729AustinWilliamson County30,440$81,589
78750AustinTravis County29,322$123,722
78759AustinTravis County44,882$102,799

USPS associates these ZIPs with Williamson County

These codes list Williamson County as a primary or acceptable city. They are not used for the ACS headline.