Zip Code 78231 — San Antonio, TX
78231 is a ZIP Code associated with San Antonio, TX, located within Bexar. 78231 ranks #56 out of 70 ZIP codes in Bexar County by population (and #828 out of 1,990 in TX). The area supports an estimated population of 9,744 residents across Data Pending housing units, with a population density of 920.2 people per square mile.
WorldPlaceData database updated: October 2026
📍 View location on OpenStreetMap (29.579780, -98.545040)
| Data Metric | Local Statistic |
|---|
| Postal / Zip Code | 78231 |
| Primary City | San Antonio |
| State / Province | TX |
| County | Bexar |
| Total Population | 9,744 |
| Median Household Income | Data Pending |
| Total Housing Units | Data Pending |
| Population Density | 920.2 people/sq mi |
| Timezone | America/Chicago |
How 78231 Compares
| Metric | ZIP 78231 | Bexar County | TX State Average |
|---|
| Population | 9,744 | 2,079,418 (Total) | 30,188,035 (Total) |
| Average ZIP Income | Data Pending | N/A | N/A |
| Population Density | 920.2 /sq mi | -- | -- |
| County Pop Rank | #56 of 70 | -- | -- |
Nearby ZIP Codes
Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →