Census place · GEOID 4863500 · Williamson County
Round Rock, TX ZIP codes
6 ZIP/ZCTAs intersecting this Census place in Williamson County.
U.S. Census Bureau, ACS 2019–2023 5-year (vintage 2023). Geography: Census place Round Rock (GEOID 4863500). Methodology
Combined population of ZIP/ZCTAs intersecting this place: 301,507 (6 ZIPs).
Combined population of ZIP/ZCTAs intersecting this place. Each intersecting ZIP contributes its full ZCTA population; overlap percents are descriptive only. This is not the Census place ACS headline above. Methodology
Map of Round Rock, TX
ZIP/ZCTA overlap with Round Rock
Population overlap
Share of each ZIP/ZCTA’s population located within Round Rock, based on ZIP Code Database place-overlap data. This is a population measure, not land-area overlap or the Census-place population.
- 786260.0%
- 786280.0%
- 7866478.8%
USPS primary city
- 7866561.8%
USPS primary city
- 7868157.1%
USPS primary city
- 787284.2%
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
ZIP codes intersecting Round Rock
| ZIP | City | County | Population | Income |
|---|---|---|---|---|
| 78626 | Georgetown | Williamson County | 45,020 | $94,967 |
| 78628 | Georgetown | Williamson County | 44,821 | $117,198 |
| 78664 | Round Rock | Williamson County | 62,272 | $85,919 |
| 78665 | Round Rock | Williamson County | 64,087 | $117,240 |
| 78681 | Round Rock | Williamson County | 58,531 | $136,215 |
| 78728 | Austin | Travis County | 26,776 | $74,048 |
USPS associates these ZIPs with Round Rock
These codes list Round Rock as a primary or acceptable city. They are not used for the ACS headline.
| ZIP | City | County | Population | Income |
|---|---|---|---|---|
| 78680 | Round Rock | Williamson County | 1,279 | — |
| 78682 | Round Rock | Williamson County | 56 | — |
| 78683 | Round Rock | Williamson County | 726 | — |