ZIP Code 76831

76831 is one of Texas's ZIP codes, delivering to addresses in Castell, Llano County.

City: Castell
County: Llano County
State: Texas
Prefix: 768xx

Where this code sits

76831 is part of the 768xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Castell.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 76831 delivers to without sharing its boundary.

325 Area code 325

ZIP codes nearest 76831

The ZIP codes whose reference points sit closest to 76831.
ZIP code	Distance	Delivers to
ZIP code 76820	7.1 mi	Art, TX
ZIP code 76885	14 mi	Valley Spring, TX
ZIP code 76869	14 mi	Pontotoc, TX
ZIP code 76856	16 mi	Mason, TX
ZIP code 76842	18 mi	Fredonia, TX
ZIP code 78643	21 mi	Llano, TX
ZIP code 78618	21 mi	Doss, TX
ZIP code 76887	24 mi	Voca, TX

Straight-line distance between place reference points, not driving distance. Where a place has no Census Gazetteer point, its postal centroid is used instead.

Each point is the reference point for 76831, plotted from its record coordinates.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Scope ZIP code 76831. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. A ZIP code is a set of delivery routes, not an area; the point shown is a record coordinate, not a centre.