ZIP Code 78231

78231 is one of Texas's ZIP codes, delivering to addresses in San Antonio, Bexar County.

City: San Antonio
County: Bexar County
State: Texas
Prefix: 782xx

Where this code sits

78231 is part of the 782xx range, the group of codes handled by one mail processing centre. San Antonio is served by 83 ZIP codes in total; the full list, with the county each falls in, is on the San Antonio page.

San Antonio Texas ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 78231 delivers to without sharing its boundary.

ZIP codes nearest 78231

The ZIP codes whose reference points sit closest to 78231.
ZIP code	Distance	Delivers to
ZIP code 78248	1.8 mi	San Antonio, TX
ZIP code 78230	2.2 mi	San Antonio, TX
ZIP code 78213	3.4 mi	San Antonio, TX
ZIP code 78216	3.7 mi	San Antonio, TX
ZIP code 78232	4.0 mi	San Antonio, TX
ZIP code 78249	4.3 mi	San Antonio, TX
ZIP code 78229	4.9 mi	San Antonio, TX
ZIP code 78240	5.1 mi	San Antonio, 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 78231, plotted from its record coordinates.

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

Scope ZIP code 78231. 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.