Residential delivery area · California
ZIP Code 94505: Discovery Bay, CA
ZIP code 94505 uses the postal name Discovery Bay, California and lies mostly in Contra Costa County (96% of its land) with the rest in Alameda County (Census 2020 ZIP-county file). About 15,000 people live there (Census Bureau, ACS 2020-2024). Median household income is $146,480 (Census Bureau, ACS 2020-2024). By Census place, 33% of its land lies in Discovery Bay (a census-designated place); 67% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Discovery Bay · its only residential ZIP
- County
- Contra Costa County (96%); Alameda County (4%)
- Census places
- Discovery Bay census-designated place
- Metro area
- San Francisco-Oakland-Fremont, CA
- House districts
- CA-9 (66%), CA-10 (30%), CA-14 (4%) 119th Congress, by share of land
- State
- California
- Time zone
- Pacific
- Land area
- 16.7 sq mi · 898 people per sq mi
Where is ZIP code 94505?
94505 centers on 37.871°, -121.597° and covers 16.7 square miles of land plus 5.8 of water. It borders 6 ZIP codes: 94514, 94513, 95391, 95206, 95219, 95304.
The map draws ZIP code areas only. For the streets inside 94505, 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 94505 compare with the rest of Contra Costa County?
| Measure | 94505 | In Contra Costa County | In CA |
|---|---|---|---|
| People (ACS 2020-2024) | 14,970 | 34th of 48 | 903rd of 1,802 |
| Median household income | $147k | 15th of 41 | 174th of 1,189 |
| Median home value | $831k | 25th of 43 | 521st of 1,317 |
Its median household income is higher than in 96% of U.S. residential ZIP codes, and it is denser than 77% 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 94505?
The 2020 Census counted 15,445 people in 94505; the ACS, which samples households over 2020-2024, estimates 14,970. Between the 2010 and 2020 censuses its population grew 15.2% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 14,970
- 2020 Census count
- 15,445+15.2% since 2010 (13,403)
- Households
- 5,446
- Median age
- 45.8
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 94505?
Of the 14,970 people the ACS estimates in 94505, 22.5% are under 18 and 19.2% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (55.7%), then Hispanic or Latino (19.2%).
- Under 1822.5%
- 18 to 6458.3%
- 65 and older19.2%
- White, not Hispanic55.7%
- Hispanic or Latino19.2%
- Other or two or more10.1%
- Black, not Hispanic8.2%
- Asian, not Hispanic6.9%
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 94505 earn?
Median household income is $146,480 (ACS 2020-2024), the 15th highest of the 41 ranked ZIP codes in Contra Costa County. It is not measurably different from 2015-2019 ($159,525 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $146,480±$19,692
- Income per person
- $64,094
- Below the poverty line
- 7.4%
- Unemployed (of the labor force)
- 8.6%
- Adults 25+ with a bachelor's degree
- 32.6%
- Adjusted gross income per tax return, 2022
- $138,4537,150 returns; wages 69% 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 94505?
FHFA's house price index for 94505, built from repeat sales and appraisals of the same homes, rose 62% from 2015 to 2025 and rose 28% from 2020 to 2025, and moved −4.5% in 2025.
- Median home value (owners' estimate)
- $830,500
- Median gross rent
- $3,029
- Homes owned by their occupants
- 90.2%
- Housing units
- 6,092
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 94505?
199 business establishments had a location in this ZIP code in 2023, 48 more than in 2018; the most are in professional, scientific, and technical services (ZIP Code Business Patterns).
- Professional, scientific, and technical services46
- Construction45
- Real estate and rental and leasing30
- Administrative and support and waste management and remediation services14
- Other services (except public administration)11
- Accommodation and food services10
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 94505?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 94514 | Byron | 1,953 | $77k | 3.8 mi |
| 94513 | Brentwood | 69,755 | $142k | 6.1 mi |
| 95391 | Tracy | 25,574 | $177k | 6.3 mi |
| 95206 | Stockton | 68,558 | $83k | 11.3 mi |
| 95219 | Stockton | 31,713 | $112k | 12.4 mi |
| 95304 | Tracy | 15,841 | $115k | 17.7 mi |
| 94548 | Knightsen | 832 | $190k | 7.7 mi (near) |
| 94561 | Oakley | 46,368 | $135k | 9.9 mi (near) |
| 94511 | Bethel Island | 1,864 | $75k | 11.0 mi (near) |
| 94531 | Antioch | 46,387 | $121k | 11.5 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.