ZIP Code 78066

78066 is one of Texas's ZIP codes, delivering to addresses in Rio Medina, Medina County.

City: Rio Medina
County: Medina County
State: Texas
Prefix: 780xx

Where this code sits

78066 is part of the 780xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Rio Medina.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 78066 delivers to without sharing its boundary.

830 Area code 830

ZIP codes nearest 78066

The ZIP codes whose reference points sit closest to 78066.
ZIP code	Distance	Delivers to
ZIP code 78056	6.6 mi	Mico, TX
ZIP code 78253	7.3 mi	San Antonio, TX
ZIP code 78009	7.4 mi	Castroville, TX
ZIP code 78254	9.9 mi	San Antonio, TX
ZIP code 78039	11 mi	La Coste, TX
ZIP code 78245	11 mi	San Antonio, TX
ZIP code 78250	12 mi	San Antonio, TX
ZIP code 78251	13 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 78066, plotted from its record coordinates.

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

Scope ZIP code 78066. 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.