Zip Code 94402
San Mateo, California — San Mateo County
📍 ZIP code 94402 is in San Mateo, San Mateo County, California.
ZIP code 94402 is located in San Mateo, San Mateo County, California. It is a zip code in the Pacific (PST/PDT) Time Zone with an estimated population of 25,498. The area code for ZIP code 94402 is 408.
Quick Answer
Zip code 94402 is in San Mateo, California (San Mateo County). It has a population of 25,498, median household income of $179,683, and median home value of $2M+.
Population
25,498
Income
$179,683
Home Value
$2M+
Climate
65°F / 43°F
About Zip Code 94402
Zip code 94402 is located in San Mateo, California, within San Mateo County. Home to approximately 25,498 residents, this area sits at an elevation of 477 ft and falls within the Pacific (PST/PDT) timezone. The local area code is 408.
The median household income is $179,683 per year, which is above the national median of $70,784. Homes in this zip code have a median value of $2M+, and the cost of living index is 250 (150% above the national average of 100).
Summers average a high of 65°F while winters drop to 43°F. The area receives about 26 in of rain annually. The zip code covers 4.9 square miles of land area.
Key Statistics
25,498
$179,683
$2M+
Pacific (PST/PDT)
408
477 ft
4.9 sq mi
40.6
10,623
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Compare With Nearby Zip Codes
| Metric | 94402 | 94403 | 94002 | 94010 | 94401 | 94070 |
|---|---|---|---|---|---|---|
| City | San Mateo, CA | San Mateo, CA | Belmont, CA | Burlingame, CA | San Mateo, CA | San Carlos, CA |
| Population | 25,498 | 43,459 | 27,730 | 42,794 | 35,628 | 30,696 |
| Median Income | $179,683 | $179,825 | $204,573 | $191,758 | $121,258 | $235,373 |
| Home Value | $2M+ | $1,725,900 | $2M+ | $2M+ | $1,123,300 | $2M+ |
| Cost of Living | 250 | 250 | 250 | 250 | 250 | 250 |
| Median Age | 40.6 | 38.5 | 40.4 | 42.5 | 35.9 | 41.6 |
Cost of Living
100 = National Average. San Mateo's cost of living is 150% above the national average.
vs. State Avg
Above
Affordability
Expensive
Income-to-Home
11.1x
Demographics
Zip code 94402 has a population of 25,498 people with a median age of 40.6. There are 10,623 housing units in this area.
Racial & Ethnic Composition
Source: U.S. Census Bureau American Community Survey estimates.
Population History
San Mateo (94402) population trend from 2010 to 2024
↑ 27.8%Source: U.S. Census Bureau estimates and American Community Survey data.
Climate & Weather
65°F
43°F
26 in
0 in
San Mateo experiences mild summers with average highs around 65°F. Winters are mild with lows averaging 43°F. The area receives virtually no snowfall.
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Housing & Economy
Median Home Value
$2M+
Median Household Income
$179,683
With 10,623 housing units across 4.9 square miles, 94402 has a housing density of 2,168 units per square mile. The home price-to-income ratio is 11.1x.
Location & Geography
Latitude
37.5236°
Longitude
-122.3449°
Land Area
4.9 sq mi
Water Area
0 sq mi
Nearby Zip Codes
Zip codes closest to 94402 (San Mateo, CA) with distances:
All Zip Codes in San Mateo, CA
Other zip codes serving San Mateo:
ZIP Codes with Similar Income Nationwide
The five U.S. ZIP codes whose median household income is closest to 94402's $179,683. A way to compare San Mateo 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 94402 (San Mateo, 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 San Mateo, California?
San Mateo, California uses zip code 94402 along with 2 other zip codes.
What county is zip code 94402 in?
Zip code 94402 is located in San Mateo County, California.
What is the population of zip code 94402?
The population of zip code 94402 is 25,498 with a median age of 40.6.
Is 94402 in San Mateo, California?
Yes, zip code 94402 is in San Mateo, San Mateo County, California. The area code is 408.
Frequently Asked Questions
What city is zip code 94402 in?
Zip code 94402 is in San Mateo, California. It is part of San Mateo County and uses the Pacific (PST/PDT) timezone.
What is zip code 94402?
Zip code 94402 is a U.S. postal code in San Mateo, California (San Mateo County). It has a population of 25,498 and covers 4.9 square miles.
What is the population of zip code 94402?
The population of zip code 94402 (San Mateo, CA) is 25,498 with a median age of 40.6. There are approximately 10,623 housing units in this area.
What is the median income in zip code 94402?
The median household income in zip code 94402 (San Mateo, CA) is $179,683 per year. The cost of living index is 250 (100 = national average).
What is the average home price in zip code 94402?
The median home value in zip code 94402 (San Mateo, CA) is $2M+. The cost of living index is 250 compared to the national average of 100.
What county is zip code 94402 in?
Zip code 94402 is located in San Mateo County, California. The primary city is San Mateo.
What is the area code for zip code 94402?
Zip code 94402 in San Mateo, CA uses area code 408. It is located in the Pacific (PST/PDT) timezone.
Is zip code 94402 a good place to live?
Zip code 94402 (San Mateo, CA) has a cost of living index of 250 (100 = national average), a median household income of $179,683, and median home values of $2M+. The median age is 40.6. Visit the full page for demographics, climate, and nearby zip code comparisons.
What is the cost of living in zip code 94402?
The cost of living index for zip code 94402 (San Mateo, CA) is 250, where 100 represents the national average. This area is above the national average. Median home value: $2M+.
What schools serve zip code 94402?
Zip code 94402 in San Mateo, California is served by the local school district of San Mateo 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.