ZIP code · Castell · Texas · United States
ZIP code 76831 — Castell
ZIP code 76831 serves Castell, Texas.
- Postal code
- 76831Single source Value from one source, not cross-checked.
- City
- Castell
- County
- Llano FIPS 48299
- State
- Texas
- Country
- United States
- Coordinates
- 30.7010, -98.9564 — precision precise (locality)
View on OpenStreetMap - Population
- 0 (ZCTA, ACS 5-year)
- Population density
- 0 / sq mi
- Land area
- 8.2 sq mi (21.3 km²) (ZCTA, ACS 5-year)
- Households
- 0
- Housing units
- 0
- Congressional district
- TX-11 (119th Congress)
- USDA hardiness zone
- 8b (15 to 20 °F)Planting / growing zone from the 2023 USDA Plant Hardiness Zone Map: average annual extreme minimum temperature, 1991–2020.
- Time zone
- America/Chicago (UTC−6 / UTC−5 DST)
- Area code
- 325 (from the nearest rate centre)Telephone area codes serving this ZIP (NANPA central-office assignments). A ZIP and an area code are different boundaries; at a border both codes may apply.
Tools: compare 76831 with another ZIP · ZIPs within 25 miles · distance from 76831
Map of ZIP code 76831
Climate — monthly normals
Warmest month Aug (avg high 96°F), coldest Jan (avg low 34°F).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 61 | 65 | 72 | 80 | 86 | 93 | 96 | 96 | 90 | 81 | 70 | 63 |
| Avg low °F | 34 | 38 | 45 | 52 | 62 | 68 | 71 | 70 | 64 | 53 | 44 | 36 |
| Precip in | 1.3 | 1.9 | 2.1 | 2.3 | 4.2 | 3.8 | 2.3 | 2.0 | 3.0 | 2.6 | 1.9 | 1.4 |
NOAA 1991–2020 climate normals from the nearest station: MASON (16.6 mi) · NOAA NCEI
About this page
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. Data generated on 2026-08-21. Methodology · Report an error on this page