Residential delivery area · Texas
ZIP Code 78621: Elgin, TX
ZIP code 78621 uses the postal name Elgin, Texas and lies mostly in Bastrop County (63% of its land), reaching into Travis County, Williamson County and Lee County (Census 2020 ZIP-county file). About 30,000 people live there (Census Bureau, ACS 2020-2024). Median household income is $98,534 (Census Bureau, ACS 2020-2024). By Census place, 4% of its land lies in Elgin, and under 1% in smaller places; 96% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Elgin · its only residential ZIP
- County
- Bastrop County (63%); Travis County (15%); Williamson County (14%); Lee County (9%)
- Census places
- Elgin
- Metro area
- Austin-Round Rock-San Marcos, TX
- House districts
- TX-10 (81%), TX-17 (19%) 119th Congress, by share of land
- State
- Texas
- Time zone
- Central
- Land area
- 177.7 sq mi · 171 people per sq mi
Where is ZIP code 78621?
78621 centers on 30.337°, -97.360° and covers 177.7 square miles of land plus 1.0 of water. It borders 7 ZIP codes: 78650, 78615, 78653, 78602, 76578, 78612, 78947.
The map draws ZIP code areas only. For the streets inside 78621, 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 78621 compare with the rest of Bastrop County?
| Measure | 78621 | In Bastrop County | In TX |
|---|---|---|---|
| People (ACS 2020-2024) | 30,411 | 4th of 14 | 377th of 1,990 |
| Median household income | $99k | 1st of 10 | 252nd of 1,172 |
| Median home value | $321k | 4th of 10 | 342nd of 1,172 |
Its median household income is higher than in 80% of U.S. residential ZIP codes, and it is denser than 61% 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 78621?
The 2020 Census counted 27,275 people in 78621; the ACS, which samples households over 2020-2024, estimates 30,411. Between the 2010 and 2020 censuses its population grew 25.9% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 30,411
- 2020 Census count
- 27,275+25.9% since 2010 (21,659)
- Households
- 10,175
- Median age
- 36.2
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 78621?
Of the 30,411 people the ACS estimates in 78621, 28.7% are under 18 and 12.5% are 65 or older. The largest group by race and Hispanic origin is Hispanic or Latino (54.6%), then White (not Hispanic) (32.8%).
- Under 1828.7%
- 18 to 6458.8%
- 65 and older12.5%
- Hispanic or Latino54.6%
- White, not Hispanic32.8%
- Black, not Hispanic7.5%
- Other or two or more4.5%
- Asian, not Hispanic0.6%
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 78621 earn?
Median household income is $98,534 (ACS 2020-2024), the highest of the 10 ranked ZIP codes in Bastrop County. It is not measurably different from 2015-2019 ($88,957 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $98,534
- Income per person
- $38,211
- Below the poverty line
- 6.4%
- Unemployed (of the labor force)
- 3.9%
- Adults 25+ with a bachelor's degree
- 24.3%
- Adjusted gross income per tax return, 2022
- $66,12814,220 returns; wages 72% 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 78621?
FHFA's house price index for 78621, built from repeat sales and appraisals of the same homes, rose 123% from 2015 to 2025 and rose 48% from 2020 to 2025, and moved +7.6% in 2025.
- Median home value (owners' estimate)
- $320,800
- Median gross rent
- $1,387
- Homes owned by their occupants
- 81.1%
- Housing units
- 11,036
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 78621?
401 business establishments had a location in this ZIP code in 2023, 110 more than in 2018; the most are in construction (ZIP Code Business Patterns).
- Construction94
- Retail trade46
- Accommodation and food services42
- Other services (except public administration)41
- Professional, scientific, and technical services33
- Health care and social assistance29
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 78621?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 78650 | McDade | 2,409 | $85k | 8.7 mi |
| 78615 | Coupland | 1,637 | $81k | 8.9 mi |
| 78653 | Manor | 41,291 | $94k | 9.6 mi |
| 78602 | Bastrop | 38,190 | $90k | 14.3 mi |
| 76578 | Thrall | 1,762 | $105k | 15.5 mi |
| 78612 | Cedar Creek | 19,799 | $96k | 18.6 mi |
| 78947 | Lexington | 5,044 | $85k | 19.2 mi |
| 78660 | Pflugerville | 124,834 | $113k | 15.7 mi (near) |
| 78724 | Austin | 31,103 | $78k | 15.7 mi (near) |
| 78725 | Austin | 10,746 | $106k | 16.5 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.