ZIP Code 78631

78631 is one of Texas's ZIP codes, delivering to addresses in Harper, Gillespie County.

City: Harper
County: Gillespie County
State: Texas
Prefix: 786xx

Where this code sits

78631 is part of the 786xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Harper.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 78631 delivers to without sharing its boundary.

830 Area code 830

ZIP codes nearest 78631

The ZIP codes whose reference points sit closest to 78631.
ZIP code	Distance	Delivers to
ZIP code 78618	13 mi	Doss, TX
ZIP code 78025	15 mi	Ingram, TX
ZIP code 78058	16 mi	Mountain Home, TX
ZIP code 78028	18 mi	Kerrville, TX
ZIP code 78029	18 mi	Kerrville, TX
ZIP code 78624	22 mi	Fredericksburg, TX
ZIP code 78024	24 mi	Hunt, TX
ZIP code 78010	26 mi	Center Point, 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 78631, plotted from its record coordinates.

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

Scope ZIP code 78631. 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.