ZIP code
78665
Round Rock, TX
78665 covers Round Rock in Williamson County, with 64,087 people in the ACS 2023 estimate.
Figures are for the Census ZIP Code Tabulation Area (ZCTA), which is not the same as a USPS ZIP code. A PO Box or unique ZIP may have no ZCTA and no demographics. Methodology
U.S. Census Bureau, ACS 2019–2023 5-year (vintage 2023). Geography: ZCTA 78665. Methodology
ZIP code map of 78665
About ZIP code 78665
More enterprise fields
Commercial ZIP directory · not ACS
Commercial ZIP directory population_count for ZCTA 78665. Not ACS. Methodology
People in 78665
Race
- White33,310
- Black or African American7,035
- American Indian or Alaska Native402
- Asian6,264
- Native Hawaiian and Pacific Islander135
- Other race4,194
- Two or more races10,237
Hispanic or Latino (any race): 15,400
Age
- Under 109,275
- 10 to 199,293
- 20 to 297,532
- 30 to 3910,034
- 40 to 499,645
- 50 to 597,276
- 60 to 694,605
- 70 to 792,726
- 80 and older1,191
Income and housing in 78665
Education
- High school graduate97.1%
- Bachelor's degree51.6%
- Graduate degree20.2%
Places covering 78665
Cities and places — Population overlap
Share of this ZIP/ZCTA’s population located within each place, based on ZIP Code Database place-overlap data. This is a population measure, not land-area overlap or the Census-place population.
- Round Rock61.8%
- Georgetown0.0%
ZIP Code Database place-overlap table, field percent_of_zip_population_in_place, keyed by place_geoid. Not ACS 2019–2023. Overlap vintage is the shipped overlap table and is separate from ACS. Methodology
Counties — Population overlap
Share of this ZIP/ZCTA’s population located within each county, based on ZIP Code Database county-overlap data. This is a population measure, not land-area overlap or the Census county population.
- Williamson County100.0%
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
38.2% of this ZIP is outside city limits (a real overlap row, not missing data).
Population history for 78665
Hover the chart or read the table below (Year | ACS | IRS).
| Year | ACS population | IRS population |
|---|---|---|
| 2006 | 1,979 | |
| 2007 | 25,144 | |
| 2008 | 29,331 | |
| 2009 | 32,555 | |
| 2010 | 35,236 | |
| 2011 | 31,767 | 36,657 |
| 2012 | 33,133 | 38,340 |
| 2013 | 36,291 | 39,680 |
| 2014 | 38,829 | 40,910 |
| 2015 | 41,517 | 43,350 |
| 2016 | 43,715 | 46,830 |
| 2017 | 46,109 | 50,510 |
| 2018 | 48,362 | 54,040 |
| 2019 | 49,074 | 58,140 |
| 2020 | 51,925 | 58,710 |
| 2021 | 59,935 | 59,000 |
| 2022 | 61,640 | 61,260 |
| 2023 | 64,087 |
ACS: U.S. Census Bureau American Community Survey 5-year estimates. IRS: Statistics of Income ZIP Code data.
ZIP codes near 78665
12 nearest ZIP centroids (any distance)
- 78664Round Rock3.1 miPop 62,272 · Income $85,919
- 78681Round Rock4.8 miPop 58,531 · Income $136,215
- 78634Hutto5.5 miPop 43,466 · Income $111,227
- 78728Austin7.3 miPop 26,776 · Income $74,048
- 78626Georgetown7.6 miPop 45,020 · Income $94,967
- 78660Pflugerville7.9 miPop 118,437 · Income $109,522
- 78717Austin8.1 miPop 36,085 · Income $140,483
- 78674Weir8.7 miPop 195 · Income $95,481
- 78729Austin9.6 miPop 30,440 · Income $81,589
- 78727Austin9.6 miPop 30,894 · Income $107,194
- 78613Cedar Park11.3 miPop 89,162 · Income $120,829
- 78753Austin11.6 miPop 58,449 · Income $62,334
ZIP centroids within 2 miles
No other ZIP codes within 2 miles of 78665, measured by Census internal-point centroids. Try a wider radius.
ZIPs within 2 miles of this place
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ZIP code 78665 FAQ
- What city is ZIP code 78665 in?
- 78665 is in Round Rock, TX.
- What county is 78665 in?
- 78665 is in Williamson County.
- What is the median household income in 78665?
- The median household income in 78665 is $117,240.
- Which ZIP codes are near 78665?
- Use the radius tool on this page to list ZIP codes within a chosen distance of 78665.