78231 ZIP Code — San Antonio, TX

Bexar County, Texas

ZIP code 78231 is located in San Antonio, Texas, within Bexar County. It covers approximately 4.09 square miles and serves a population of 9,972 residents. This is a standard ZIP code in the Central (CT) timezone, served by area code 210.

About ZIP code 78231

The housing stock consists of predominantly single-family detached homes. Most homes were built in the 1980s, giving the area an established character. Median home value is $366,800. Owner-occupancy sits near the national average at 67%.

The gap between median ($106,719) and mean household income suggests income inequality — a small number of higher earners pull the average up. The poverty rate of 4% is below the national average.

The dominant occupation class is management, business, and professional, with education and healthcare as the leading industry. The average commute of 22 minutes is near the national average.

Educational attainment is high — 59% of residents hold a bachelor's degree or higher, well above the national average of 33%.

Notable community characteristics include a notable veteran presence at 13% of civilians, above the national average of 7%.

Overall, ZIP code 78231 reflects a community defined by a highly educated population and a strong veteran community.

9,972

population

4.09

sq mi land

Standard

ZIP type

Central (CT)

timezone

78231 ZIP code map

Cities in ZIP code 78231

Below are the cities the US Postal Service accepts for ZIP code 78231. Using any city not on this list may result in mail delivery delays.

City	Status
San Antonio	Acceptable
San Antonio	Preferred

Nearby ZIP codes

78248 San Antonio (1.3 mi) 78230 San Antonio (2.4 mi) 78213 San Antonio (3.8 mi) 78232 San Antonio (4.2 mi) 78249 San Antonio (4.3 mi) 78216 San Antonio (4.5 mi) 78229 San Antonio (4.9 mi) 78240 San Antonio (5.5 mi) 78258 San Antonio (6.3 mi) 78256 San Antonio (6.4 mi) 78201 San Antonio (7 mi) 78217 San Antonio (7.2 mi)

Demographics updated 06/2026

Population
Total population	9,972
Population density	2,438 / sq mi
State FIPS	48
County FIPS	029

Geography
Land area	4.09 sq mi
Water area	0.01 sq mi
Latitude	29.5736
Longitude	-98.5427
Timezone	Central (CT)
Area code	210

Total population by age

Gender

Race & ethnicity

Economics updated 06/2026

Household income

Income range	This ZIP	County avg	State avg
Under $50k	27.2%	43.3%	39.5%
$50k – $100k	26.5%	31.4%	30.1%
$100k – $200k	28.5%	19.9%	22.6%
Over $200k	17.8%	5.4%	7.8%

Demographics & statistics

9,972

Population

2,438

People per sq mi

38.7

Median age

$106,719

Median household income

$56,451

Per capita income

$366,800

Median home value

$1,267

Median monthly rent

66.9%

Home ownership

4.3%

Poverty rate

4.3%

Unemployment

2,796

Housing units

59.2%

Bachelor's or higher

Age distribution

Male Female

158

Under 5

163

283

5–9

293

311

10–14

323

358

15–19

370

367

20–24

380

861

25–34

893

501

35–44

520

586

45–54

607

364

55–59

378

244

60–64

253

515

65–74

533

258

75–84

267

85+

← Male

Female →

Age summary

Group	Count	%
Under 18	1,963	19.7%
18 and over	8,009	80.3%
65 and over	1,759	17.6%
Median age	38.7 years

Race & ethnicity

White 57.7%

Two or more races 15.1%

Hispanic or Latino 15.1%

Black or African American 5.6%

Other race 3.3%

Asian 3.1%

American Indian / Alaska Native 0.1%

Group	Count	%
White	6,778	57.7%
Two or more races	1,769	15.1%
Hispanic or Latino	1,767	15.1%
Black or African American	658	5.6%
Other race	387	3.3%
Asian	364	3.1%
American Indian / Alaska Native	16	0.1%

Household income

Income range	This ZIP	County avg	State avg
Under $50k	27.2%	43.3%	39.5%
$50k – $100k	26.5%	31.4%	30.1%
$100k – $200k	28.5%	19.9%	22.6%
Over $200k	17.8%	5.4%	7.8%

Under $10k 1.4%

$10k–$15k 2.0%

$15k–$25k 2.6%

$25k–$35k 7.6%

$35k–$50k 11.8%

$50k–$75k 12.9%

$75k–$100k 7.1%

$100k–$150k 25.2%

$150k–$200k 14.6%

$200k+ 14.8%

Range	% of households
Under $10k	1.4%
$10k–$15k	2.0%
$15k–$25k	2.6%
$25k–$35k	7.6%
$35k–$50k	11.8%
$50k–$75k	12.9%
$75k–$100k	7.1%
$100k–$150k	25.2%
$150k–$200k	14.6%
$200k+	14.8%
Median income	$106,719

Housing

Home values

$100k–$150k 0.4%

$150k–$200k 1.6%

$200k–$300k 26.9%

$300k–$500k 47.7%

$500k–$1M 15.8%

$1M+ 7.6%

Housing overview

Metric	Value
Median home value	$366,800
Median rent / month	$1,267
Owner occupied	66.9%
Renter occupied	33.1%
Vacant	2.5%
Single-family detached	70.2%
Large apartment buildings	11.2%
Mobile homes	0.8%
Median rooms	6.2
Avg household size (owned)	2.77

Year built

Era	%
2020 or later	0.0%
2010–2019	14.4%
2000–2009	5.4%
1990–1999	21.6%
1980–1989	33.8%
1970–1979	16.5%
1960–1969	5.1%
1950–1959	2.4%
1940–1949	0.0%
1939 or earlier	0.7%

Bedrooms

Size	% of units
No bedroom (studio)	2.9%
1 bedroom	16.3%
2 bedrooms	13.5%
3 bedrooms	26.9%
4 bedrooms	32.2%
5+ bedrooms	8.3%

Vehicles per household

Vehicles	% of households
No vehicle	3.6%
1 vehicle	31.6%
2 vehicles	40.2%
3 or more	24.6%

Heating fuel

Fuel type	%
Utility gas	43.6%
Electricity	51.6%
Propane / LP gas	3.1%
Solar	0.2%
No fuel used	1.1%

Households & families

Household type	Count	%
Married-couple family	2,091	52.0%
Cohabiting couple	127	3.2%
Male householder, no spouse	600	14.9%
Female householder, no spouse	1,202	29.9%
Households with children under 18	1,139	28.3%
Households with seniors (65+)	1,269	31.6%
Average household size	2.48

Marital status

Status	Male	Female
Never married	41.6%	21.7%
Married	51.2%	54.0%
Separated	0.7%	1.6%
Widowed	0.8%	7.0%
Divorced	5.8%	15.7%

Education

Less than 9th grade 0.7%

Some HS, no diploma 2.2%

HS graduate 13.2%

Some college, no degree 16.3%

Associate's degree 8.6%

Bachelor's degree 30.0%

Graduate / professional 29.1%

Metric	%
HS diploma or higher	97.2%
Bachelor's or higher	59.2%

School enrollment (ages 3–17)

Type	Count	%
Nursery / preschool	106	4.4%
Kindergarten	82	3.4%
Elementary school	1,073	44.9%
High school	618	25.9%
College / grad school	509	21.3%

Employment

Industry of employment

Education & healthcare 27.1%

Finance & real estate 14.9%

Professional & management 12.9%

Arts, food & hospitality 11.5%

Retail trade 9.8%

Manufacturing 4.9%

Wholesale trade 4.7%

Other services 3.7%

Public administration 2.9%

Construction 2.8%

Information 2.7%

Transportation & utilities 1.9%

Agriculture & mining 0.1%

Occupation

Category	%
Management, business & arts	52.3%
Service	17.9%
Sales & office	22.9%
Natural resources & construction	2.7%
Production & transportation	4.2%

Employment type

Type	%
Private sector	85.7%
Government	8.8%
Self-employed	4.4%
Unpaid family workers	1.0%

Commute

Method	%
Drive alone	74.5%
Carpool	5.8%
Public transit	0.5%
Walk	1.9%
Work from home	16.5%
Other means	0.8%
Avg commute (minutes)	21.6

Poverty

All people 4.3%

Under 18 years 5.6%

18 and over 4.0%

Married-couple families 0.2%

Female-led households 7.7%

Income support

Source	% of households
Social Security	28.4%
Retirement income	29.1%
Supplemental Security	2.8%
Cash public assistance	1.8%
Food stamps / SNAP	2.4%

Health indicators

Condition	%
Obesity	35.3%
High blood pressure	34.9%
High cholesterol	34.6%
Diabetes	11.1%
Heart disease	6.2%
Stroke	2.6%
Asthma	8.6%
Arthritis	22.9%
Kidney disease	2.8%
Pulmonary disease	5.3%
Cancer	6.9%

Behavior / access	%
Smoking	11.7%
Binge drinking	17.0%
No physical activity	17.7%
Less than 7 hrs sleep	32.5%
Depression	20.7%
Fair or poor health	13.4%
Poor mental health	13.2%
Poor physical health	9.2%
No health insurance	19.4%
Visited doctor (checkup)	73.8%
Visited dentist	65.6%
Cholesterol screening	92.2%
Teeth loss	8.9%

Veterans & disability

Veterans	Count	%
Civilian veterans	1,069	13.4%

Disability	%
Any disability	16.7%
Under 18	22.7%
18–64 years	9.9%
65 and over	33.8%

Health insurance coverage

Type	%
Private insurance	80.1%
Public insurance	25.3%
No insurance	9.3%
Uninsured under 19	3.7%

Language & origin

Language spoken at home (age 5+)

Language	Count	%
English only	9,651	96.8%
Spanish	547	5.7%
Other Indo-European	489	5.1%
Asian & Pacific Islander	34	0.4%
Other languages	24	0.2%

Place of birth & citizenship

Origin	Count	%
Native born (US)	8,856	88.8%
Born in same state	8,529	85.5%
Born in different state	5,751	57.7%
Foreign born	327	3.3%
Naturalized citizen	1,116	11.2%
Not a US citizen	825	73.9%

Ancestry

Ancestry	Count	%
French	805	8.1%
Italian	498	5%
Arab	264	2.6%
English	107	1.1%
German	64	0.6%

Ancestry	Count	%
Norwegian	34	0.3%
Dutch	30	0.3%
Polish	21	0.2%
Irish	10	0.1%

Technology access

Metric	% of households
Computer access	40.3%
Internet access	95.9%

Source: U.S. Census Bureau, American Community Survey 2025 estimates.

Frequently asked questions about ZIP code 78231

What city is ZIP code 78231 in?

ZIP code 78231 is primarily assigned to San Antonio, Texas.

What county is ZIP code 78231 in?

ZIP code 78231 falls within Bexar County, Texas.

How educated is the population of ZIP code 78231?

59% of residents hold a bachelor's degree or higher — well above the national average of ~33%, reflecting a highly educated population.

Does ZIP code 78231 have a large veteran population?

13% of civilians in ZIP code 78231 are veterans, above the national average of ~7%.

What is the typical home value in ZIP code 78231?

The median home value in ZIP code 78231 is $366,800.

What is the median household income in ZIP code 78231?

The median household income in ZIP code 78231 is $106,719, above the national median of ~$75,000.

What timezone is ZIP code 78231 in?

ZIP code 78231 observes the CST timezone.