Residential delivery area · California
ZIP Code 94531: Antioch, CA
ZIP code 94531 is in Antioch, California, entirely in Contra Costa County (Census 2020 ZIP-county file). About 46,000 people live there (Census Bureau, ACS 2020-2024), the less populous of Antioch's 2 residential ZIP codes. Median household income is $120,927 (Census Bureau, ACS 2020-2024). By Census place, 89% of its land lies in Antioch; 11% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Antioch · 2 residential ZIPs
- County
- Contra Costa County
- Census places
- Antioch
- Metro area
- San Francisco-Oakland-Fremont, CA
- House district
- CA-10 119th Congress
- State
- California
- Time zone
- Pacific
- Land area
- 14.0 sq mi · 3,307 people per sq mi
Where is ZIP code 94531?
94531 centers on 37.957°, -121.778° and covers 14.0 square miles of land. It borders 3 ZIP codes: 94509, 94561, 94513.
The map draws ZIP code areas only. For the streets inside 94531, 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 94531 compare with the rest of Antioch?
| Measure | 94531 | In Antioch | In Contra Costa County | In CA |
|---|---|---|---|---|
| People (ACS 2020-2024) | 46,387 | 2nd of 2 | 7th of 48 | 278th of 1,802 |
| Median household income | $121k | 1st of 2 | 28th of 41 | 347th of 1,189 |
| Median home value | $702k | 1st of 2 | 33rd of 43 | 677th of 1,317 |
Its median household income is higher than in 91% of U.S. residential ZIP codes, and it is denser than 90% 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 94531?
The 2020 Census counted 45,342 people in 94531; the ACS, which samples households over 2020-2024, estimates 46,387. Its boundary changed between the 2010 and 2020 censuses, so the two counts are not compared.
- People, ACS 2020-2024
- 46,387
- 2020 Census count
- 45,342
- Households
- 13,905
- Median age
- 38.8
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 94531?
Of the 46,387 people the ACS estimates in 94531, 21.9% are under 18 and 12.8% are 65 or older. The largest group by race and Hispanic origin is Black (not Hispanic) (24.7%), then Hispanic or Latino (23.6%).
- Under 1821.9%
- 18 to 6465.3%
- 65 and older12.8%
- Black, not Hispanic24.7%
- Hispanic or Latino23.6%
- White, not Hispanic23.1%
- Asian, not Hispanic20.7%
- Other or two or more7.9%
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 94531 earn?
Median household income is $120,927 (ACS 2020-2024), the 28th highest of the 41 ranked ZIP codes in Contra Costa County.
- Median household income
- $120,927
- Income per person
- $46,240
- Below the poverty line
- 8.3%
- Unemployed (of the labor force)
- 7.2%
- Adults 25+ with a bachelor's degree
- 32.3%
- Adjusted gross income per tax return, 2022
- $83,46122,890 returns; wages 83% 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 94531?
FHFA's house price index for 94531, built from repeat sales and appraisals of the same homes, rose 71% from 2015 to 2025 and rose 21% from 2020 to 2025, and moved −5.9% in 2025.
- Median home value (owners' estimate)
- $701,600
- Median gross rent
- $3,150
- Homes owned by their occupants
- 73.2%
- Housing units
- 14,239
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 94531?
559 business establishments had a location in this ZIP code in 2023, 92 more than in 2018; the most are in health care and social assistance (ZIP Code Business Patterns).
- Health care and social assistance129
- Construction76
- Retail trade63
- Accommodation and food services56
- Professional, scientific, and technical services47
- Transportation and warehousing43
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 94531?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 94509 | Antioch | 70,090 | $86k | 3.1 mi |
| 94561 | Oakley | 46,368 | $135k | 5.4 mi |
| 94513 | Brentwood | 69,755 | $142k | 5.4 mi |
| 94548 | Knightsen | 832 | $190k | 7.0 mi (near) |
| 94517 | Clayton | 12,316 | $169k | 7.7 mi (near) |
| 94565 | Pittsburg | 100,488 | $96k | 8.9 mi (near) |
| 94511 | Bethel Island | 1,864 | $75k | 9.4 mi (near) |
| 94521 | Concord | 41,909 | $126k | 10.5 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.