Residential delivery area · Texas
ZIP Code 78681: Round Rock, TX
ZIP code 78681 uses the postal name Round Rock, Texas and lies entirely in Williamson County (Census 2020 ZIP-county file). About 57,000 people live there (Census Bureau, ACS 2020-2024), the least populous of Round Rock's 3 residential ZIP codes. Median household income is $137,819 (Census Bureau, ACS 2020-2024). By Census place, its land lies in Round Rock (45%) and Brushy Creek (18%), and 1% in smaller places; 36% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Round Rock · 3 residential ZIPs
- County
- Williamson County
- Census places
- Round Rock (45%); Brushy Creek (18%) census-designated place
- Metro area
- Austin-Round Rock-San Marcos, TX
- House districts
- TX-31 (80%), TX-10 (13%), TX-17 (6%) 119th Congress, by share of land
- State
- Texas
- Time zone
- Central
- Land area
- 23.2 sq mi · 2,445 people per sq mi
Where is ZIP code 78681?
78681 centers on 30.542°, -97.717° and covers 23.2 square miles of land plus 0.1 of water. It borders 8 ZIP codes: 78717, 78665, 78664, 78728, 78613, 78628, 78626, 78641.
The map draws ZIP code areas only. For the streets inside 78681, 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 78681 compare with the rest of Round Rock?
| Measure | 78681 | In Round Rock | In Williamson County | In TX |
|---|---|---|---|---|
| People (ACS 2020-2024) | 56,691 | 3rd of 3 | 5th of 27 | 95th of 1,990 |
| Median household income | $138k | 1st of 3 | 2nd of 22 | 61st of 1,172 |
| Median home value | $497k | 1st of 3 | 6th of 24 | 104th of 1,172 |
Its median household income is higher than in 95% of U.S. residential ZIP codes, and it is denser than 86% 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 78681?
The 2020 Census counted 57,503 people in 78681; the ACS, which samples households over 2020-2024, estimates 56,691. Its boundary changed between the 2010 and 2020 censuses, so the two counts are not compared.
- People, ACS 2020-2024
- 56,691
- 2020 Census count
- 57,503
- Households
- 20,135
- Median age
- 39.3
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 78681?
Of the 56,691 people the ACS estimates in 78681, 26.7% are under 18 and 11.3% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (54.7%), then Hispanic or Latino (22.0%).
- Under 1826.7%
- 18 to 6462.0%
- 65 and older11.3%
- White, not Hispanic54.7%
- Hispanic or Latino22.0%
- Asian, not Hispanic12.9%
- Other or two or more6.0%
- Black, not Hispanic4.4%
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 78681 earn?
Median household income is $137,819 (ACS 2020-2024), the 2nd highest of the 22 ranked ZIP codes in Williamson County.
- Median household income
- $137,819
- Income per person
- $59,301
- Below the poverty line
- 5.5%
- Unemployed (of the labor force)
- 3.0%
- Adults 25+ with a bachelor's degree
- 58.0%
- Adjusted gross income per tax return, 2022
- $131,95025,410 returns; wages 77% 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 78681?
FHFA's house price index for 78681, built from repeat sales and appraisals of the same homes, rose 104% from 2015 to 2025 and rose 44% from 2020 to 2025, and moved −0.9% in 2025.
- Median home value (owners' estimate)
- $497,300
- Median gross rent
- $1,963
- Homes owned by their occupants
- 73.9%
- Housing units
- 20,781
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 78681?
1,432 business establishments had a location in this ZIP code in 2023, 228 more than in 2018; the most are in professional, scientific, and technical services (ZIP Code Business Patterns).
- Professional, scientific, and technical services260
- Health care and social assistance226
- Accommodation and food services146
- Construction119
- Retail trade119
- Other services (except public administration)115
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 78681?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 78717 | Austin | 37,262 | $145k | 4.2 mi |
| 78665 | Round Rock | 66,171 | $123k | 4.8 mi |
| 78664 | Round Rock | 62,060 | $87k | 4.8 mi |
| 78728 | Austin | 26,777 | $75k | 6.3 mi |
| 78613 | Cedar Park | 89,956 | $126k | 6.6 mi |
| 78628 | Georgetown | 50,822 | $126k | 9.2 mi |
| 78626 | Georgetown | 48,072 | $100k | 9.9 mi |
| 78641 | Leander | 99,865 | $135k | 11.8 mi |
| 78729 | Austin | 30,460 | $86k | 6.3 mi (near) |
| 78727 | Austin | 29,958 | $110k | 7.8 mi (near) |
| 78750 | Austin | 29,277 | $122k | 8.1 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.