Zip Code 94598
Walnut Creek, California — Contra Costa County
📍 ZIP code 94598 is in Walnut Creek, Contra Costa County, California.
ZIP code 94598 is located in Walnut Creek, Contra Costa County, California. It is a zip code in the Pacific (PST/PDT) Time Zone with an estimated population of 26,293. The area code for ZIP code 94598 is 408.
Quick Answer
Zip code 94598 is in Walnut Creek, California (Contra Costa County). It has a population of 26,293, median household income of $188,170, and median home value of $1,307,100.
Population
26,293
Income
$188,170
Home Value
$1,307,100
Climate
83°F / 42°F
About Zip Code 94598
Zip code 94598 is located in Walnut Creek, California, within Contra Costa County. Home to approximately 26,293 residents, this area sits at an elevation of 269 ft and falls within the Pacific (PST/PDT) timezone. The local area code is 408.
The median household income is $188,170 per year, which is above the national median of $70,784. Homes in this zip code have a median value of $1,307,100, and the cost of living index is 250 (150% above the national average of 100).
Summers average a high of 83°F while winters drop to 42°F. The area receives about 26 in of rain and 1 in of snow annually. The zip code covers 15.2 square miles of land area.
Key Statistics
26,293
$188,170
$1,307,100
Pacific (PST/PDT)
408
269 ft
15.2 sq mi
45.5
10,735
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Compare With Nearby Zip Codes
| Metric | 94598 | 94596 | 94507 | 94518 | 94595 | 94521 |
|---|---|---|---|---|---|---|
| City | Walnut Creek, CA | Walnut Creek, CA | Alamo, CA | Concord, CA | Walnut Creek, CA | Concord, CA |
| Population | 26,293 | 23,592 | 14,546 | 27,743 | 17,051 | 41,118 |
| Median Income | $188,170 | $137,660 | $250,001 | $111,406 | $98,108 | $127,312 |
| Home Value | $1,307,100 | $1,245,000 | $2M+ | $826,500 | $816,600 | $823,100 |
| Cost of Living | 250 | 250 | 250 | 227 | 207 | 232 |
| Median Age | 45.5 | 37.5 | 50.5 | 40.4 | 68.8 | 43 |
Cost of Living
100 = National Average. Walnut Creek's cost of living is 150% above the national average.
vs. State Avg
Above
Affordability
Expensive
Income-to-Home
6.9x
Demographics
Zip code 94598 has a population of 26,293 people with a median age of 45.5. There are 10,735 housing units in this area.
Racial & Ethnic Composition
Source: U.S. Census Bureau American Community Survey estimates.
Population History
Walnut Creek (94598) population trend from 2010 to 2024
↑ 577.7%Source: U.S. Census Bureau estimates and American Community Survey data.
Climate & Weather
83°F
42°F
26 in
1 in
Walnut Creek experiences warm summers with average highs around 83°F. Winters are mild with lows averaging 42°F. The area receives about 1 in of snow per year.
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Housing & Economy
Median Home Value
$1,307,100
Median Household Income
$188,170
With 10,735 housing units across 15.2 square miles, 94598 has a housing density of 706 units per square mile. The home price-to-income ratio is 6.9x.
Location & Geography
Latitude
37.8999°
Longitude
-121.9992°
Land Area
15.2 sq mi
Water Area
0 sq mi
Nearby Zip Codes
Zip codes closest to 94598 (Walnut Creek, CA) with distances:
All Zip Codes in Walnut Creek, CA
Other zip codes serving Walnut Creek:
ZIP Codes with Similar Income Nationwide
The five U.S. ZIP codes whose median household income is closest to 94598's $188,170. A way to compare Walnut Creek to economically similar communities elsewhere in the country.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
ZIP Codes with Similar Demographics
The five U.S. ZIP codes whose racial and ethnic composition most closely matches 94598 (Walnut Creek, CA). Similarity is measured by cosine distance on the five-category ACS demographic vector.
Computed from U.S. Census Bureau ACS 5-Year Estimates by the Zip Code Near Me Data Team.
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People Also Ask
What zip code is Walnut Creek, California?
Walnut Creek, California uses zip code 94598 along with 2 other zip codes.
What county is zip code 94598 in?
Zip code 94598 is located in Contra Costa County, California.
What is the population of zip code 94598?
The population of zip code 94598 is 26,293 with a median age of 45.5.
Is 94598 in Walnut Creek, California?
Yes, zip code 94598 is in Walnut Creek, Contra Costa County, California. The area code is 408.
Frequently Asked Questions
What city is zip code 94598 in?
Zip code 94598 is in Walnut Creek, California. It is part of Contra Costa County and uses the Pacific (PST/PDT) timezone.
What is zip code 94598?
Zip code 94598 is a U.S. postal code in Walnut Creek, California (Contra Costa County). It has a population of 26,293 and covers 15.2 square miles.
What is the population of zip code 94598?
The population of zip code 94598 (Walnut Creek, CA) is 26,293 with a median age of 45.5. There are approximately 10,735 housing units in this area.
What is the median income in zip code 94598?
The median household income in zip code 94598 (Walnut Creek, CA) is $188,170 per year. The cost of living index is 250 (100 = national average).
What is the average home price in zip code 94598?
The median home value in zip code 94598 (Walnut Creek, CA) is $1,307,100. The cost of living index is 250 compared to the national average of 100.
What county is zip code 94598 in?
Zip code 94598 is located in Contra Costa County, California. The primary city is Walnut Creek.
What is the area code for zip code 94598?
Zip code 94598 in Walnut Creek, CA uses area code 408. It is located in the Pacific (PST/PDT) timezone.
Is zip code 94598 a good place to live?
Zip code 94598 (Walnut Creek, CA) has a cost of living index of 250 (100 = national average), a median household income of $188,170, and median home values of $1,307,100. The median age is 45.5. Visit the full page for demographics, climate, and nearby zip code comparisons.
What is the cost of living in zip code 94598?
The cost of living index for zip code 94598 (Walnut Creek, CA) is 250, where 100 represents the national average. This area is above the national average. Median home value: $1,307,100.
What schools serve zip code 94598?
Zip code 94598 in Walnut Creek, California is served by the local school district of Contra Costa County. For specific school information, check your state's department of education or GreatSchools.org.
All demographic data on this page is sourced from the U.S. Census Bureau American Community Survey (ACS) 5-Year Estimates. ZIP code boundary and delivery data is sourced from the United States Postal Service (USPS). Data is updated periodically and may not reflect the most current figures. Census Bureau ZIP Code Tabulation Areas (ZCTAs) may differ slightly from USPS ZIP code boundaries.
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Data Sources
- Population, income, housing, age, and demographics
- U.S. Census Bureau, American Community Survey 5-Year Estimates, 2019-2023 vintage.
- ZIP to city and county mapping
- USPS and HUD-USPS ZIP-County Crosswalk.
- Time zones and area codes
- IANA tz database and NANPA.
- Elevation
- U.S. Geological Survey National Elevation Dataset (NED), via the USGS Elevation Point Query Service. Mapped to each ZCTA centroid coordinates. Last refreshed 2026-05-19.
- Last refreshed
- 2026-05-18.