ZIP Code 78231 – San Antonio, TX
San Antonio, Texas · Bexar County · Central time
| ZIP code | 78231 |
|---|---|
| City | San Antonio |
| State | Texas |
| County | Bexar County |
| Population | 9,744 |
| Time zone | Central · local time |
| ZIP type | Standard (has a Census ZCTA area) |
| Land area | 4.09 sq mi |
| Center (lat, long) | 29.5810, -98.5425 |
Area codes in this area
These are the area codes that most often serve ZIP 78231 (including overlays). The exact area code depends on the phone number — landlines, mobiles and overlays can differ even on the same street.
Map
Nearby ZIP codes
About ZIP 78231
ZIP code 78231 is assigned to San Antonio, Texas. It lies in Bexar County. Its Census area covers about 4.09 square miles of land. The closest neighboring ZIP is 78248 (San Antonio), about 1.2 miles away.
Every address in 78231 also has a 4-digit add-on code (ZIP+4) that points to a smaller delivery area. Use the box above to find it.
Sources: US Census Bureau (ZCTA, county relationship files), GeoNames (CC BY 4.0), NANPA via NumberResearch.org (CC BY 4.0). Map © OpenStreetMap contributors. ZIP areas are approximate. Population: U.S. Census Bureau, ACS 5-year estimates, 2024 (ZCTA). Data sources