Residential delivery area · California
ZIP Code 94403: San Mateo, CA
ZIP code 94403 is in San Mateo, California, entirely in San Mateo County (Census 2020 ZIP-county file). About 43,000 people live there (Census Bureau, ACS 2020-2024), the most populous of San Mateo's 4 residential ZIP codes. Median household income is $174,917 (Census Bureau, ACS 2020-2024).
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- San Mateo · 4 residential ZIPs
- County
- San Mateo County
- Census places
- San Mateo
- Neighborhoods
- Hillsdale, Laurel GeoNames
- Metro area
- San Francisco-Oakland-Fremont, CA
- House district
- CA-15 119th Congress
- State
- California
- Time zone
- Pacific
- Land area
- 5.6 sq mi · 7,683 people per sq mi
- PO Box ZIPs
- 94497 also use the name San Mateo
Where is ZIP code 94403?
94403 centers on 37.538°, -122.305° and covers 5.6 square miles of land plus 0.2 of water. It borders 4 ZIP codes: 94402, 94002, 94404, 94401.
The map draws ZIP code areas only. For the streets inside 94403, 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); neighborhoods from the GeoNames gazetteer (CC BY 4.0), placed in this ZIP code by PlainZIP.
How does 94403 compare with the rest of San Mateo?
| Measure | 94403 | In San Mateo | In San Mateo County | In CA |
|---|---|---|---|---|
| People (ACS 2020-2024) | 43,276 | 1st of 4 | 5th of 31 | 330th of 1,802 |
| Median household income | $175k | 2nd of 4 | 11th of 23 | 94th of 1,189 |
| Median home value | $1.75M | 2nd of 4 | 13th of 27 | 92nd of 1,317 |
Its median household income is higher than in 98% of U.S. residential ZIP codes, and it is denser than 97% 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 94403?
The 2020 Census counted 45,057 people in 94403; the ACS, which samples households over 2020-2024, estimates 43,276. Between the 2010 and 2020 censuses its population grew 13.7% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 43,276
- 2020 Census count
- 45,057+13.7% since 2010 (39,642)
- Households
- 16,414
- Median age
- 38.9
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 94403?
Of the 43,276 people the ACS estimates in 94403, 19.2% are under 18 and 16.3% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (35.7%), then Asian (not Hispanic) (31.1%).
- Under 1819.2%
- 18 to 6464.5%
- 65 and older16.3%
- White, not Hispanic35.7%
- Asian, not Hispanic31.1%
- Hispanic or Latino25.3%
- Other or two or more6.6%
- Black, not Hispanic1.4%
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 94403 earn?
Median household income is $174,917 (ACS 2020-2024), the 11th highest of the 23 ranked ZIP codes in San Mateo County. It is not measurably different from 2015-2019 ($165,490 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $174,917
- Income per person
- $88,226
- Below the poverty line
- 6.6%
- Unemployed (of the labor force)
- 5.8%
- Adults 25+ with a bachelor's degree
- 60.6%
- Adjusted gross income per tax return, 2022
- $196,65221,690 returns; wages 74% 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 94403?
FHFA's house price index for 94403, built from repeat sales and appraisals of the same homes, rose 33% from 2015 to 2025 and rose 24% from 2020 to 2025, and moved +5.1% in 2025.
- Median home value (owners' estimate)
- $1,746,300
- Median gross rent
- $3,263
- Homes owned by their occupants
- 52.5%
- Housing units
- 17,799
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 94403?
1,204 business establishments had a location in this ZIP code in 2023, 27 more than in 2018; the most are in health care and social assistance (ZIP Code Business Patterns).
- Health care and social assistance183
- Professional, scientific, and technical services173
- Retail trade164
- Accommodation and food services133
- Other services (except public administration)112
- Construction76
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 94403?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 94402 | San Mateo | 25,475 | $173k | 1.4 mi |
| 94002 | Belmont | 27,534 | $204k | 1.8 mi |
| 94404 | San Mateo | 35,881 | $192k | 2.4 mi |
| 94401 | San Mateo | 35,295 | $122k | 2.7 mi |
| 94065 | Redwood City | 11,673 | $216k | 3.1 mi (near) |
| 94070 | San Carlos | 30,447 | $240k | 3.4 mi (near) |
| 94010 | Burlingame | 43,025 | $197k | 4.5 mi (near) |
| 94061 | Redwood City | 37,048 | $146k | 6.5 mi (near) |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.