City · Texas · United States
Round Mountain, TX — ZIP codes
1 ZIP code · Blanco County
- City
- Round Mountain
- County
- Blanco
- State
- Texas
- Country
- United States
- Postal code
- 78663Single source
- Coordinates
- 30.4429, -98.4365 View on OpenStreetMap
- Area code
- 830
ZIP codes (1)
| Postal code | Place name | Verification |
|---|---|---|
| 78663 | Round Mountain | Single source |
Sources and verification
US ZIP codes have five digits. They are postal routing areas, not administrative boundaries: a ZIP can span more than one city or county, and the city shown is the primary USPS name for that code.
GeoNames · U.S. Census Bureau (ACS) · U.S. Census Bureau · NOAA NCEI · usda-phzm. Last generated : 2026-08-21. Report an error.