ZIP Code 78588

78588 is one of Texas's ZIP codes, delivering to addresses in San Isidro, Starr County.

City: San Isidro
County: Starr County
State: Texas
Prefix: 785xx

Where this code sits

78588 is part of the 785xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to San Isidro.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 78588 delivers to without sharing its boundary.

956 Area code 956

ZIP codes nearest 78588

The ZIP codes whose reference points sit closest to 78588.
ZIP code	Distance	Delivers to
ZIP code 78536	3.6 mi	Delmita, TX
ZIP code 78591	10 mi	Santa Elena, TX
ZIP code 78563	14 mi	Linn, TX
ZIP code 78541	21 mi	Edinburg, TX
ZIP code 78353	22 mi	Encino, TX
ZIP code 78574	28 mi	Mission, TX
ZIP code 78542	29 mi	Edinburg, TX
ZIP code 78360	30 mi	Guerra, 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 78588, plotted from its record coordinates.

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

Scope ZIP code 78588. 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.