Zip Code 94404
Foster City, California — San Mateo County
📍 ZIP code 94404 is in Foster City, San Mateo County, California.
ZIP code 94404 is located in Foster City, San Mateo County, California. It is a zip code in the Pacific (PST/PDT) Time Zone with an estimated population of 35,950. The area code for ZIP code 94404 is 408.
Quick Answer
Zip code 94404 is in Foster City, California (San Mateo County). It has a population of 35,950, median household income of $182,417, and median home value of $1,682,700.
Population
35,950
Income
$182,417
Home Value
$1,682,700
Climate
81°F / 41°F
About Zip Code 94404
Zip code 94404 is located in Foster City, California, within San Mateo County. Home to approximately 35,950 residents, this area sits at an elevation of 5 ft and falls within the Pacific (PST/PDT) timezone. The local area code is 408.
The median household income is $182,417 per year, which is above the national median of $70,784. Homes in this zip code have a median value of $1,682,700, and the cost of living index is 250 (150% above the national average of 100).
Summers average a high of 81°F while winters drop to 41°F. The area receives about 19 in of rain annually. The zip code covers 4.3 square miles of land area and 0.6 square miles of water.
Key Statistics
35,950
$182,417
$1,682,700
Pacific (PST/PDT)
408
5 ft
4.3 sq mi
40.1
15,166
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Compare With Nearby Zip Codes
| Metric | 94404 | 94065 | 94403 | 94401 | 94002 | 94070 |
|---|---|---|---|---|---|---|
| City | Foster City, CA | Redwood City, CA | San Mateo, CA | San Mateo, CA | Belmont, CA | San Carlos, CA |
| Population | 35,950 | 11,620 | 43,459 | 35,628 | 27,730 | 30,696 |
| Median Income | $182,417 | $213,361 | $179,825 | $121,258 | $204,573 | $235,373 |
| Home Value | $1,682,700 | $1,847,000 | $1,725,900 | $1,123,300 | $2M+ | $2M+ |
| Cost of Living | 250 | 250 | 250 | 250 | 250 | 250 |
| Median Age | 40.1 | 42.6 | 38.5 | 35.9 | 40.4 | 41.6 |
Cost of Living
100 = National Average. Foster City's cost of living is 150% above the national average.
vs. State Avg
Above
Affordability
Expensive
Income-to-Home
9.2x
Demographics
Zip code 94404 has a population of 35,950 people with a median age of 40.1. There are 15,166 housing units in this area.
Racial & Ethnic Composition
Source: U.S. Census Bureau American Community Survey estimates.
Population History
Foster City (94404) population trend from 2010 to 2024
↑ 188.3%Source: U.S. Census Bureau estimates and American Community Survey data.
Climate & Weather
81°F
41°F
19 in
0 in
Foster City experiences warm summers with average highs around 81°F. Winters are mild with lows averaging 41°F. The area receives virtually no snowfall.
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Housing & Economy
Median Home Value
$1,682,700
Median Household Income
$182,417
With 15,166 housing units across 4.3 square miles, 94404 has a housing density of 3,527 units per square mile. The home price-to-income ratio is 9.2x.
Location & Geography
Latitude
37.5560°
Longitude
-122.2677°
Land Area
4.3 sq mi
Water Area
0.6 sq mi
Nearby Zip Codes
Zip codes closest to 94404 (Foster City, CA) with distances:
ZIP Codes with Similar Income Nationwide
The five U.S. ZIP codes whose median household income is closest to 94404's $182,417. A way to compare Foster City 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 94404 (Foster City, 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 Foster City, California?
Foster City, California uses zip code 94404.
What county is zip code 94404 in?
Zip code 94404 is located in San Mateo County, California.
What is the population of zip code 94404?
The population of zip code 94404 is 35,950 with a median age of 40.1.
Is 94404 in Foster City, California?
Yes, zip code 94404 is in Foster City, San Mateo County, California. The area code is 408.
Frequently Asked Questions
What city is zip code 94404 in?
Zip code 94404 is in Foster City, California. It is part of San Mateo County and uses the Pacific (PST/PDT) timezone.
What is zip code 94404?
Zip code 94404 is a U.S. postal code in Foster City, California (San Mateo County). It has a population of 35,950 and covers 4.3 square miles.
What is the population of zip code 94404?
The population of zip code 94404 (Foster City, CA) is 35,950 with a median age of 40.1. There are approximately 15,166 housing units in this area.
What is the median income in zip code 94404?
The median household income in zip code 94404 (Foster City, CA) is $182,417 per year. The cost of living index is 250 (100 = national average).
What is the average home price in zip code 94404?
The median home value in zip code 94404 (Foster City, CA) is $1,682,700. The cost of living index is 250 compared to the national average of 100.
What county is zip code 94404 in?
Zip code 94404 is located in San Mateo County, California. The primary city is Foster City.
What is the area code for zip code 94404?
Zip code 94404 in Foster City, CA uses area code 408. It is located in the Pacific (PST/PDT) timezone.
Is zip code 94404 a good place to live?
Zip code 94404 (Foster City, CA) has a cost of living index of 250 (100 = national average), a median household income of $182,417, and median home values of $1,682,700. The median age is 40.1. Visit the full page for demographics, climate, and nearby zip code comparisons.
What is the cost of living in zip code 94404?
The cost of living index for zip code 94404 (Foster City, CA) is 250, where 100 represents the national average. This area is above the national average. Median home value: $1,682,700.
What schools serve zip code 94404?
Zip code 94404 in Foster City, 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.