Round Rock, TX ZIP codes
Round Rock, Texas has 6 ZIP codes, including 3 PO Box ZIPs. They are in Williamson County.
- Population in these ZIPs
- 184,922
- Avg. median income
- $115,500population-weighted
- Typical home value
- $394,700population-weighted
- Metro area
- Austin-Round Rock-San Marcos, TX
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Round Rock, TX ZIP codes list
| ZIP code | County | Population | Median income | Typical home value |
|---|---|---|---|---|
| 78664 | Williamson County | 62,060 | $87,417 | $327,600 |
| 78665 | Williamson County | 66,171 | $122,680 | $390,300 |
| 78680 PO Box | Williamson County | — | — | — |
| 78681 | Williamson County | 56,691 | $137,819 | $473,200 |
| 78682 PO Box | Williamson County | — | — | — |
| 78683 PO Box | Williamson County | — | — | — |
Population and median household income: ACS 2020–2024 5-year estimates. Typical home value: Zillow Home Value Index (September 2026) where available, otherwise the ACS median owner-reported value. "PO Box" marks ZIP codes with no delivery area of their own. Methodology
Cities near Round Rock
- Weir 6 mi
- Hutto 6 mi
- Georgetown 7 mi
- Pflugerville 11 mi
- Cedar Park 13 mi
- Taylor 15 mi
- Granger 15 mi
- Jarrell 16 mi
- Coupland 17 mi
- Leander 17 mi
- Manor 19 mi
- Bartlett 19 mi
Frequently asked questions
What is the ZIP code for Round Rock, TX?
Round Rock, TX has 6 ZIP codes: 78664, 78665, 78680, 78681, 78682 and 78683.
What county is Round Rock, Texas in?
Round Rock ZIP codes are in Williamson County.
Which Round Rock ZIP codes are PO Boxes?
78680, 78682 and 78683 are PO Box or single-organization ZIP codes; they have no residential delivery area.