Residential delivery area · California
ZIP Code 94598: Walnut Creek, CA
ZIP code 94598 uses the postal name Walnut Creek, California and lies entirely in Contra Costa County (Census 2020 ZIP-county file). About 27,000 people live there (Census Bureau, ACS 2020-2024), the most populous of Walnut Creek's 4 residential ZIP codes. Median household income is $186,225 (Census Bureau, ACS 2020-2024). By Census place, its land lies in Walnut Creek (38%), North Gate (4%) and Shell Ridge (2%); 56% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Walnut Creek · 4 residential ZIPs
- County
- Contra Costa County
- Census places
- Walnut Creek (38%); North Gate (4%) census-designated place; Shell Ridge (2%) census-designated place
- Metro area
- San Francisco-Oakland-Fremont, CA
- House district
- CA-10 119th Congress
- State
- California
- Time zone
- Pacific
- Land area
- 20.6 sq mi · 1,320 people per sq mi
Where is ZIP code 94598?
94598 centers on 37.917°, -122.015° and covers 20.6 square miles of land plus 0.0 of water. It borders 8 ZIP codes: 94596, 94518, 94597, 94521, 94507, 94517, 94506, 94588.
The map draws ZIP code areas only. For the streets inside 94598, 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 94598 compare with the rest of Walnut Creek?
| Measure | 94598 | In Walnut Creek | In Contra Costa County | In CA |
|---|---|---|---|---|
| People (ACS 2020-2024) | 27,206 | 1st of 4 | 23rd of 48 | 671st of 1,802 |
| Median household income | $186k | 1st of 4 | 11th of 41 | 72nd of 1,189 |
| Median home value | $1.34M | 1st of 4 | 14th of 43 | 180th of 1,317 |
Its median household income is higher than in 99% of U.S. residential ZIP codes, and it is denser than 81% 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 94598?
The 2020 Census counted 26,826 people in 94598; the ACS, which samples households over 2020-2024, estimates 27,206. Its boundary changed between the 2010 and 2020 censuses, so the two counts are not compared.
- People, ACS 2020-2024
- 27,206
- 2020 Census count
- 26,826
- Households
- 10,828
- Median age
- 45.9
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 94598?
Of the 27,206 people the ACS estimates in 94598, 20.1% are under 18 and 25.2% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (63.7%), then Asian (not Hispanic) (16.7%).
- Under 1820.1%
- 18 to 6454.7%
- 65 and older25.2%
- White, not Hispanic63.7%
- Asian, not Hispanic16.7%
- Hispanic or Latino9.8%
- Other or two or more8.6%
- Black, not Hispanic1.3%
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 94598 earn?
Median household income is $186,225 (ACS 2020-2024), the 11th highest of the 41 ranked ZIP codes in Contra Costa County.
- Median household income
- $186,225±$25,541
- Income per person
- $95,937
- Below the poverty line
- 5.4%
- Unemployed (of the labor force)
- 4.7%
- Adults 25+ with a bachelor's degree
- 73.7%
- Adjusted gross income per tax return, 2022
- $223,76213,360 returns; wages 61% 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 94598?
FHFA's house price index for 94598, built from repeat sales and appraisals of the same homes, rose 55% from 2015 to 2025 and rose 30% from 2020 to 2025, and moved +0.9% in 2025.
- Median home value (owners' estimate)
- $1,339,900
- Median gross rent
- $2,940
- Homes owned by their occupants
- 76.3%
- Housing units
- 10,928
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 94598?
985 business establishments had a location in this ZIP code in 2023, 69 more than in 2018; the most are in health care and social assistance (ZIP Code Business Patterns).
- Health care and social assistance290
- Professional, scientific, and technical services192
- Finance and insurance60
- Information53
- Administrative and support and waste management and remediation services53
- Real estate and rental and leasing51
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 94598?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 94596 | Walnut Creek | 23,417 | $136k | 2.3 mi |
| 94518 | Concord | 27,345 | $112k | 2.4 mi |
| 94597 | Walnut Creek | 23,129 | $132k | 3.1 mi |
| 94521 | Concord | 41,909 | $126k | 3.5 mi |
| 94507 | Alamo | 14,586 | $250k+ | 4.4 mi |
| 94517 | Clayton | 12,316 | $169k | 6.9 mi |
| 94506 | Danville | 27,055 | $250k+ | 9.8 mi |
| 94588 | Pleasanton | 34,328 | $191k | 11.9 mi |
| 94523 | Pleasant Hill | 34,592 | $143k | 4.2 mi (near) |
| 94595 | Walnut Creek | 16,988 | $101k | 4.3 mi (near) |
| 94519 | Concord | 19,058 | $122k | 5.0 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.