San Antonio, TX · standard
ZIP Code 78231
Bexar County, Texas - Census ACS demographics, housing tenure, and business patterns, benchmarked against every US ZIP.
- 7,906
- 790/sq mi High-density area
- $109,183
- Median income Above-median income area
- $401,800
- Median home value Above-median home value
- 65.7%
- Bachelor's or higher Above-average bachelor's attainment
National ZIP placement
San Antonio pairs an upper-quartile household income with upper-quartile home values, in a low-density, homeowner-dominated area.
- Top 14%
- household income, US ZIPs
- Top 20%
- home value, US ZIPs
- 790
- people per sq mi
- 66%
- owner-occupied homes
Source: U.S. Census Bureau ACS 5-Year Estimates (2019–2023). Percentiles rank ZIP 78231 against every reporting US ZIP.
ZIP code 78231 is a mid-sized community (a standard USPS delivery area) in San Antonio, Bexar County, Texas, home to 7,906 residents across 10.0 square miles, a density of 790 people per square mile, in the Chicago time zone.
ZIP 78231 lands in the middle-income range, with a median household income of $109,183 (44% above the average Texas ZIP), while per-capita income is $57,828. Both reported hardship measures are comparatively low in absolute terms: poverty is 5.8% and unemployment is 2.7%. Housing is both higher-cost and owner-heavy: median home value is $401,800 (62% above the average Texas ZIP), while 66.2% of occupied homes are owner-occupied and median rent is $1,393.
This is a highly-educated ZIP: 65.7% of adults hold a bachelor's degree or higher, the median age is 41.2, and the average commute is -. The page also surfaces 10 ZIP codes within roughly 10 miles and 6 more in Bexar County, so 78231 can be compared with both its immediate and county-level context.
Every figure on this page is sourced from the U.S. Census Bureau American Community Survey 5-Year Estimates (including median rent) and the FHFA House Price Index, no estimates, no proprietary scoring. Verify with Census →
Top industries in ZIP 78231
Top 5 sectors by establishment count in San Antonio, TX
Which industries have the most business establishments in ZIP 78231.
- Health care and social assistance
Health care and social assistance
65 establishments
- Finance and insurance
Finance and insurance
49 establishments
- Professional, scientific, and technical services
Professional, scientific, and technical services
49 establishments
- Accommodation and food services
Accommodation and food services
41 establishments
- Other services (except public administration)
Other services (except public administration)
30 establishments
What this shows Establishment counts come from the Census ZIP Code Business Patterns program, which counts physical business locations rather than employees or revenue.
Source: U.S. Census Bureau, American Community Survey 5-Year Estimates + ZIP Code Business Patterns + FHFA HPI ACS demographics and median rent, ZBP business establishments, FHFA HPI for ZIP 78231, San Antonio, TX · 2023 Census ACS 5-Year Estimates use a rolling 60-month sample for stable small-geography estimates; ZBP updated annually; FHFA HPI updated quarterly/annually.
Quick Facts
7,906
Population
10.0
Area (sq mi)
790
People / sq mi
Chicago
Time Zone
standard
ZIP Type
Who lives in ZIP 78231?
41.2
Median Age
48.6%
Male
51.4%
Female
11.6%
Foreign-Born
Hispanic or Latino is an ethnicity category from the Census Bureau and may overlap with other categories above.
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
How much do residents earn?
$109,183
Median Household Income
+44% vs state ZIP avg
$57,828
Per Capita Income
5.8%
Poverty Rate
2.7%
Unemployment Rate
How ZIP 78231 ranks among Texas ZIPs
San Antonio, TX household income vs. every Texas ZIP code
Median household income among 1,737 reporting Texas ZIPs (this ZIP's population is too small for a reliable national-corpus placement)
$109,183 Top 12% higher than 88% of 1,737 Texas ZIPs
Each bar is a $20K-wide band; taller bars hold more Texas ZIPs. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source U.S. Census Bureau, ACS 5-Year Estimates · 2019–2023
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
What is the education profile here?
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
What does housing look like?
Housing stock: occupied vs vacant
4,083housing units
4,083
Total Housing Units
3,978
Occupied Units
105
Vacant Units
2.44
Avg Household Size
Occupancy Type
$401,800
Median Home Value
+62% vs state ZIP avg
$1,393
Median Rent
1987
Median Year Built
Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)
How have home values changed over time?
FHFA House Price Index, annual appreciation data based on repeat sales and appraisals
+0.1%
YoY Change (2024)
306
HPI Index (2000 = 100)
+206%
Total Change Since 2000
Home values in ZIP 78231 have increased 0.1% over the past year (2024). Since 2000, this ZIP has seen +206% cumulative appreciation.
| Year | Annual Change | HPI Index |
|---|---|---|
| 2020 | +3.8% | 216 |
| 2021 | +8.6% | 234 |
| 2022 | +20.4% | 282 |
| 2023 | +8.6% | 306 |
| 2024 | +0.1% | 306 |
Source: Federal Housing Finance Agency (FHFA) House Price Index, All-Transactions, Five-Digit ZIP Codes (Developmental Index). Index base = 100 in year 2000. Data through 2024. ZIP codes with few transactions may show missing values.
What businesses operate in this ZIP?
Census Bureau data shows 359 business establishments in ZIP 78231, employing approximately 4,196 people with a combined annual payroll of $251,033,000.
359
Businesses
4,196
Employees
$251.0M
Annual Payroll
15
Industry Sectors
| Industry | Establishments | % of Total |
|---|---|---|
| Health care and social assistance | 65 | 18.1% |
| Finance and insurance | 49 | 13.7% |
| Professional, scientific, and technical services | 49 | 13.7% |
| Accommodation and food services | 41 | 11.4% |
| Other services (except public administration) | 30 | 8.4% |
| Retail trade | 27 | 7.5% |
| Real estate and rental and leasing | 27 | 7.5% |
| Construction | 24 | 6.7% |
| Administrative and support and waste management and remediation services | 15 | 4.2% |
| Educational services | 8 | 2.2% |
| Information | 6 | 1.7% |
| Manufacturing | 5 | 1.4% |
| Arts, entertainment, and recreation | 4 | 1.1% |
| Transportation and warehousing | 3 | 0.8% |
| Management of companies and enterprises | 3 | 0.8% |
Source: U.S. Census Bureau, ZIP Code Business Patterns (ZBP), 2023. Employment figures may include noise for disclosure avoidance.
Nearby ZIP Codes
Want a side-by-side? Compare 78231 vs 78248 →
ZIP 78231 vs its nearest neighbors, by population
Resident population of this ZIP and the closest reporting ZIP codes within ~10 miles.
- 78240
San Antonio (78240)
51,111 residents
- 78249
San Antonio (78249)
49,951 residents
- 78201
San Antonio (78201)
45,307 residents
- 78258
San Antonio (78258)
40,586 residents
- 78213
San Antonio (78213)
40,396 residents
- 78216
San Antonio (78216)
40,267 residents
- 78230
San Antonio (78230)
39,089 residents
- 78232
San Antonio (78232)
35,120 residents
- 78229
San Antonio (78229)
28,804 residents
What this shows Among its immediate neighbors, ZIP 78231 ranks #0 by population - useful context the national average alone can't give.
ZIP 78231 vs its nearest neighbors, by median income
Median household income of this ZIP and the closest reporting ZIP codes within ~10 miles.
- 78248
San Antonio (78248)
$130,552 median income
- 78258
San Antonio (78258)
$117,835 median income
- 78231
San Antonio (78231)
$109,183 median income
- 78232
San Antonio (78232)
$85,273 median income
- 78249
San Antonio (78249)
$80,565 median income
- 78230
San Antonio (78230)
$73,529 median income
- 78240
San Antonio (78240)
$63,351 median income
- 78216
San Antonio (78216)
$59,110 median income
- 78213
San Antonio (78213)
$55,884 median income
What this shows By household income, ZIP 78231 ranks #3 of 9 neighboring ZIPs, local affluence varies block to block, not just metro to metro.
| ZIP Code | City | Population | Distance |
|---|---|---|---|
| 78248 | San Antonio, TX | 13,638 | 1.4 mi |
| 78230 | San Antonio, TX | 39,089 | 2.3 mi |
| 78232 | San Antonio, TX | 35,120 | 4.1 mi |
| 78213 | San Antonio, TX | 40,396 | 4.4 mi |
| 78249 | San Antonio, TX | 49,951 | 4.3 mi |
| 78216 | San Antonio, TX | 40,267 | 4.3 mi |
| 78229 | San Antonio, TX | 28,804 | 5.3 mi |
| 78258 | San Antonio, TX | 40,586 | 4.8 mi |
| 78240 | San Antonio, TX | 51,111 | 5.4 mi |
| 78201 | San Antonio, TX | 45,307 | 7.6 mi |
Nationwide ZIPs with similar ACS profiles
Two Census-derived peer sets for ZIP 78231, both outside TX so the neighborhoods are not geographic containment (Nearby and same-county blocks stay local).
Similar population
Nearest cross-state ZIPs by resident population (7,906 here; floor ≥1,000).
Similar median household income
Nearest cross-state ZIPs by ACS median household income.
More ZIP Codes in Bexar County
Related Areas
Frequently Asked Questions
What county is ZIP code 78231 in?
ZIP code 78231 (San Antonio) is located in Bexar County, Texas. Bexar County contains multiple ZIP codes, see the full list at /counties/bexar-tx.
What is the population of ZIP code 78231?
ZIP code 78231 in San Antonio, TX has a population of 7,906 according to the Census Bureau ACS 2023 estimates.
What is the median household income in ZIP 78231?
The median household income in ZIP 78231 is $109,183, which is 43% above the national average of $76,288.
What is the average home value in ZIP 78231?
The median home value in ZIP 78231 is $401,800, which is 44% above the national average of $278,155.
What is the demographic makeup of ZIP 78231?
The largest racial group in ZIP 78231 is White at 61.1%. Hispanic or Latino residents make up 39.3% of the population.
How many businesses are in ZIP code 78231?
ZIP code 78231 has 359 business establishments employing approximately 4,196 people, according to Census Bureau ZIP Code Business Patterns (ZBP) 2023 data.
What are the main industries in ZIP code 78231?
The top industries by establishment count in ZIP 78231 are: Health care and social assistance (65), Finance and insurance (49), Professional, scientific, and technical services (49). There are 15 industry sectors represented in total.
How have home values changed in ZIP code 78231?
According to the FHFA House Price Index, home values in ZIP 78231 increased by 0.1% in 2024. Since 2000, home values in this ZIP have appreciated by approximately 206%. This is a developmental index based on repeat sales and appraisal data from Fannie Mae and Freddie Mac.
What is the education level in ZIP code 78231?
In ZIP code 78231, 78.2% of residents aged 25+ have a high school diploma or higher, and 65.7% hold a bachelor's degree or higher. These figures come from the Census Bureau ACS 5-Year Estimates (2023).
What percentage of residents own vs. rent in ZIP 78231?
In ZIP code 78231, approximately 66.2% of occupied housing units are owner-occupied and 33.8% are renter-occupied, based on Census ACS 2023 data.
What is the poverty rate in ZIP code 78231?
The poverty rate in ZIP code 78231 is 5.8% according to Census Bureau ACS 2023 estimates. This measures the percentage of the population living below the federal poverty threshold.
Related
Take this with you
What to do with ZIP 78231's numbers, next.
- See how ZIP 78231 compares to a neighboring ZIP code on the same Census fields Compare this ZIP
- Check where San Antonio, TX ranks among every U.S. ZIP code on income, education, or homeownership View national rankings
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ZIP Code Tabulation Areas (ZCTAs) are Census Bureau approximations of USPS ZIP codes; figures describe the ZCTA area, not any single address within it.