Residential delivery area · Texas
ZIP Code 78731: Austin, TX
ZIP code 78731 is in Austin, Texas, entirely in Travis County (Census 2020 ZIP-county file). About 28,000 people live there (Census Bureau, ACS 2020-2024), the 20th most populous of Austin's 44 residential ZIP codes. Median household income is $105,494 (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Austin · 44 residential ZIPs
- County
- Travis County
- Census places
- Austin
- Metro area
- Austin-Round Rock-San Marcos, TX
- House district
- TX-37 119th Congress
- State
- Texas
- Time zone
- Central
- Land area
- 8.7 sq mi · 3,145 people per sq mi
- PO Box ZIPs
- 30 more ZIP codes use the name Austin for PO boxes or single organizations
Where is ZIP code 78731?
78731 centers on 30.348°, -97.768° and covers 8.7 square miles of land plus 0.2 of water. It borders 7 ZIP codes: 78757, 78756, 78703, 78759, 78746, 78730, 78750.
The map draws ZIP code areas only. For the streets inside 78731, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).
How does 78731 compare with the rest of Austin?
| Measure | 78731 | In Austin | In Travis County | In TX |
|---|---|---|---|---|
| People (ACS 2020-2024) | 27,507 | 20th of 44 | 28th of 60 | 439th of 1,990 |
| Median household income | $106k | 19th of 39 | 25th of 52 | 189th of 1,172 |
| Median home value | $903k | 7th of 41 | 7th of 56 | 14th of 1,172 |
Its median household income is higher than in 84% of U.S. residential ZIP codes, and it is denser than 89% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 78731?
The 2020 Census counted 27,240 people in 78731; the ACS, which samples households over 2020-2024, estimates 27,507. Between the 2010 and 2020 censuses its population grew 10.7% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 27,507
- 2020 Census count
- 27,240+10.7% since 2010 (24,614)
- Households
- 14,343
- Median age
- 42.3
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 78731?
Of the 27,507 people the ACS estimates in 78731, 15.9% are under 18 and 19.3% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (73.3%), then Hispanic or Latino (13.2%).
- Under 1815.9%
- 18 to 6464.8%
- 65 and older19.3%
- White, not Hispanic73.3%
- Hispanic or Latino13.2%
- Asian, not Hispanic7.7%
- Other or two or more3.8%
- Black, not Hispanic2.1%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 78731 earn?
Median household income is $105,494 (ACS 2020-2024), the 25th highest of the 52 ranked ZIP codes in Travis County. It is not measurably different from 2015-2019 ($116,381 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $105,494
- Income per person
- $94,483
- Below the poverty line
- 6.0%
- Unemployed (of the labor force)
- 4.6%
- Adults 25+ with a bachelor's degree
- 78.3%
- Adjusted gross income per tax return, 2022
- $295,57414,190 returns; wages 45% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 78731?
FHFA's house price index for 78731, built from repeat sales and appraisals of the same homes, rose 69% from 2015 to 2025 and rose 28% from 2020 to 2025, and moved +0.1% in 2025.
- Median home value (owners' estimate)
- $903,200
- Median gross rent
- $1,737
- Homes owned by their occupants
- 53.1%
- Housing units
- 15,163
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 78731?
2,255 business establishments had a location in this ZIP code in 2023, 853 more than in 2018; the most are in professional, scientific, and technical services (ZIP Code Business Patterns).
- Professional, scientific, and technical services684
- Health care and social assistance370
- Real estate and rental and leasing191
- Finance and insurance161
- Administrative and support and waste management and remediation services133
- Other services (except public administration)127
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 78731?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 78757 | Austin | 23,856 | $104k | 2.1 mi |
| 78756 | Austin | 9,197 | $95k | 2.5 mi |
| 78703 | Austin | 23,483 | $153k | 3.8 mi |
| 78759 | Austin | 43,182 | $102k | 3.8 mi |
| 78746 | Austin | 28,256 | $188k | 4.3 mi |
| 78730 | Austin | 9,142 | $159k | 4.4 mi |
| 78750 | Austin | 29,277 | $122k | 6.5 mi |
| 78751 | Austin | 16,961 | $81k | 3.7 mi (near) |
| 78752 | Austin | 23,317 | $68k | 4.0 mi (near) |
| 78705 | Austin | 33,238 | $32k | 4.1 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.