ZIP Code · TX

ZIP 78231

Part of San Antonio, TX

Pop. 9,744·Bexar County·652nd most expensive ZIP in Texas

Median rent (all units)

$1,130/mo

Year-over-Year

Stable

Month-over-Month

Stable

vs US Median

-$802

Reported rents

Stable (Monthly)

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Most AffordableMost Expensive

ZIP 78231 · $1,130

More affordable than 94% of US ZIP codes · National median $1,932/mo

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Compare your rent to the local median.

Medians by bedroom

Rent by unit size

Studio

$1,100

1 BR

$1,200

2 BR

$1,460

3 BR

$1,870

4 BR+

$2,180

Research median

$1,460/mo

Bedroom estimates are gross rents that include essential utilities (electricity, water, gas, sewer, trash).

Rent trends

12-month history

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Last updated: October 17, 2026

From the history

What the numbers show

What a typical income covers

30% of the median household income ($109,183) is $2,730 a month. That covers HUD's Fair Market Rent for up to a 4-bedroom ($2,180).

Rank in San Antonio

5th cheapest of 54 ZIP codes in San Antonio.

From Zillow's monthly rent index (ZORI) for ZIP 78231. Income is the Census median household income (5-year estimates). Fair Market Rents are HUD’s, which include utilities.

Annual cost

$13,560/yr

At $1,130/mo median

Location

CitySan Antonio

StateTX

CountyBexar County

Rent Market Meter

Balanced Market

Renter's MarketBalancedLandlord's Market

Rents are roughly steady, with neither renters nor landlords holding a strong edge right now.

Based on rent-price momentum (+0.0% YoY, +0.1% MoM), not inventory.

Demographics

Who lives here

ZIP 78231 (San Antonio, TX) is majority owner-occupied, has a large retiree population, has a median income above the national average, 65.7% of residents hold a bachelor's degree or higher.

Population

9,744

Median income

$109,183

Median age

41.2

Renters

33.8%

Age distribution

20.8%

25.4%

21.9%

20.4%

Under 1820.8%

18–3425.4%

35–5421.9%

55–6411.4%

65+20.4%

Gender

48.6%

51.4%

Male48.6%

Female51.4%

Race & ethnicity

61.1%

39.3%

White61.1%

Black4.5%

Hispanic39.3%

Asian3.7%

Education (25+)

12.5%

21.4%

65.7%

HS diploma12.5%

Some college21.4%

Bachelor's+65.7%

Housing tenure

66.2%

33.8%

Owner66.2%

Renter33.8%

Source: U.S. Census Bureau · ACS 2024 5-Year Estimates

2021 vs 2026

How ZIP 78231 in San Antonio, TX has changed in 5 years

Income

$103,504 → $109,183

up 5.5%

Population

10,109 → 9,744

down 3.6%

Renter share

31.4% → 33.8%

+2.4 pts

Bachelor's+

57.3% → 65.7%

+8.4 pts

Median age

40.2 → 41.2

+1.0 yrs

Census figures show median household income at $109,183 today, compared with $103,504 five years earlier. The population has contracted by 3.6% since 2021, moving from about 10,109 residents to roughly 9,744. Renters now make up 33.8% of households, compared with 31.4% five years ago. College-educated residents now make up 65.7% of adults here, versus 57.3% in 2021.

Community

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Local insights

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About renting in ZIP 78231

Last updated: October 17, 2026

ZIP code 78231 covers San Antonio, TX. The median rent here is $1,130/mo as of October 2026. A 1-bedroom rents for a median of $1,200/mo. A 2-bedroom rents for a median of $1,460/mo.

At 12% of local median household income ($109,183/yr), ZIP 78231 ranks as affordable compared to the national benchmark of 30%. Rent prices have stayed steady over the past year.

FAQ

Frequently asked questions

How much income do you need to rent in ZIP 78231?

To keep rent at or below 30% of gross income, you would need to earn at least $45,000/year (about $22/hour full-time) to afford the median rent of $1,130/mo in ZIP 78231. The local median household income is $109,183/yr, so the typical household meets that bar.