Postal reference / United States
78588San Isidro, Texas
ZIP code 78588 is a United States postal code for San Isidro, Texas. Its county association is Starr County. The map reference point is at 26.7167, -98.4539.
- State / territory
- Texas
- Recorded place name
- San Isidro
- County association
- Starr
- Estimated coordinate
- 26.7167, -98.4539
View on OpenStreetMap - ZIP prefix
- 785 · 68 ZIP codes share it
- Data source
- GeoNames postal reference, snapshot September 26, 2026
GeoNames reference data. County associations may not include every intersecting county, place names are postal names rather than legal boundaries, and coordinates are approximate. This is not address validation.
Area
- Land area
- 36.615 sq mi (2023 Census Gazetteer)
Figures are for the ZIP Code Tabulation Area (ZCTA) that most closely matches this ZIP code, not an exact match to USPS delivery boundaries. Source: U.S. Census Bureau, 2023 Gazetteer + 2023 ACS 5-Year Estimates, retrieved 2026-09-27. How to read this data.
Need the last four digits?
ZIP+4 depends on the full delivery address. A five-digit code alone cannot determine its extension.
Find ZIP+4Explore Texas
Browse the other 2,599 ZIP codes recorded for Texas, sorted by code with place and county.
Texas directoryNearby ZIP code reference points
| ZIP code | Place | State | County association | Miles |
|---|---|---|---|---|
| 78536 | Delmita | TX | Starr | 3.6 |
| 78591 | Santa Elena | TX | Starr | 10.1 |
| 78563 | Linn | TX | Hidalgo | 14.0 |
| 78541 | Edinburg | TX | Hidalgo | 21.3 |
| 78353 | Encino | TX | Brooks | 21.6 |
| 78574 | Mission | TX | Willacy | 28.0 |
| 78542 | Edinburg | TX | Hidalgo | 29.4 |
| 78360 | Guerra | TX | Jim Hogg | 29.5 |
Straight-line distance between reference points. Nearby points do not prove that ZIP areas touch.
Verify a mailing address
For mailing, confirm the complete street or PO Box address with USPS. A place record does not confirm delivery eligibility or the ZIP+4 extension.
Open USPS address lookup