San Mateo County, California demographics
San Mateo County, California (county FIPS 06081) has a median household income of $158,855 (±$2,851) and a total population of 742,340 in the American Community Survey 5-year estimates for 2020-2024.
Margins of error are at the 90% confidence level. The figures describe 2020-2024 (dollars in 2024 dollars), not the present. 31 ZIP Code Tabulation Areas overlap the county (Census 2020).
Data as of Oct 22, 2026 (Olympus publication) · Markdown version
- Values are ACS 5-year estimates for 2020-2024 (dollars in 2024 dollars), not current figures.
- ZCTA-county overlaps come from the Census 2020 relationship file and use 2020 counties, by land area; Connecticut uses its legacy counties, not the planning regions in ACS 2022+.
ACS 5-year estimates, 2020-2024
Census American Community Survey 5-year estimates for 2020-2024, with 90% margins of error as published by the Census Bureau.
| Metric | Estimate | Margin of error (90%) | ACS table |
|---|---|---|---|
| Total population | 742,340 | none (controlled estimate) | B01003 |
| Median age | 40.9 years | ±0.2 years | B01002 |
| Households | 264,419 | ±1,253 | B11001 |
| Median household income (inflation-adjusted to the final ACS year) | $158,855 | ±$2,851 | B19013 |
| Median value of owner-occupied housing units | $1,559,600 | ±$16,159 | B25077 |
| Median gross rent | $2,922 | ±$40 | B25064 |
| Owner-occupied share of occupied housing units | 58.5% | none (derived from several estimates) | B25003 (derived) |
| Renter-occupied share of occupied housing units | 41.5% | none (derived from several estimates) | B25003 (derived) |
| High school graduate or higher (age 25+) | 90.3% | none (derived from several estimates) | B15003 (derived) |
| Bachelor's degree or higher (age 25+) | 53.7% | none (derived from several estimates) | B15003 (derived) |
| Share of people below the poverty level | 6.7% | none (derived from several estimates) | B17001 (derived) |
| Unemployment rate (civilian labor force) | 4.8% | none (derived from several estimates) | B23025 (derived) |
- Dollar values are in 2024 inflation-adjusted dollars.
- Percentages' margins of error are in percentage points (pp).
Geography
| Measure | Value |
|---|---|
| County FIPS | 06081 |
| Land area | 448.62 sq mi |
| Water area | 292.34 sq mi |
| Population density | 1,655 per sq mi of land |
| Geography vintage | 2024 Gazetteer |
ZIP codes (ZCTAs) in this county
ZCTAs that overlap the county in the Census 2020 ZCTA to county relationship file, largest share of the county's land first.
| ZCTA | Share of county land | Share of ZCTA land | County is the ZCTA's primary county |
|---|---|---|---|
| 94060 | 16.4% | 100% | Yes |
| 94062 | 14.4% | 100% | Yes |
| 94019 | 13.3% | 100% | Yes |
| 94020 | 9.4% | 100% | Yes |
| 94074 | 5.2% | 100% | Yes |
| 94010 | 3.4% | 100% | Yes |
| 94044 | 3.4% | 100% | Yes |
| 94028 | 3.1% | 81.1% | Yes |
| 94021 | 2.4% | 100% | Yes |
| 94080 | 2.3% | 100% | Yes |
| 94025 | 1.9% | 100% | Yes |
| 94063 | 1.4% | 100% | Yes |
| 94014 | 1.4% | 100% | Yes |
| 94070 | 1.4% | 100% | Yes |
| 94066 | 1.4% | 100% | Yes |
| 94038 | 1.3% | 100% | Yes |
| 94015 | 1.3% | 100% | Yes |
| 94403 | 1.3% | 100% | Yes |
| 94002 | 1.3% | 100% | Yes |
| 94037 | 1.2% | 100% | Yes |
| 94402 | 1.1% | 100% | Yes |
| 94027 | 1.1% | 100% | Yes |
| 94005 | 1% | 100% | Yes |
| 94404 | 1% | 100% | Yes |
| 94061 | 0.9% | 100% | Yes |
| 94030 | 0.8% | 100% | Yes |
| 94128 | 0.7% | 100% | Yes |
| 94401 | 0.7% | 100% | Yes |
| 94303 | 0.6% | 32.9% | |
| 94065 | 0.5% | 100% | Yes |
| 94018 | 0.1% | 100% | Yes |
Sources
- American Community Survey 5-year estimates (Census Data API) — U.S. Census Bureau. ACS 5-year 2020-2024 (release acs5-2024:county), source date 2025-09-02. https://api.census.gov/data/2024/acs/acs5?get=NAME,B01003_001E,B01003_001M,B01002_001E,B01002_001M,B11001_001E,B11001_001M,B19013_001E,B19013_001M,B25077_001E,B25077_001M,B25064_001E,B25064_001M,B25003_001E,B25003_002E,B25003_003E,B15003_001E,B15003_017E,B15003_018E,B15003_019E,B15003_020E,B15003_021E,B15003_022E,B15003_023E,B15003_024E,B15003_025E,B17001_001E,B17001_002E,B23025_003E,B23025_005E&for=county:081&in=state:06
- Published by Olympus on Oct 22, 2026.
- Source data: U.S. Census Bureau. Works of the U.S. government are not subject to copyright in the United States.
- This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.
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curl -s "https://api.olympus.new-odyssey.com/v1/geo-demographics/counties/06081" -H "X-API-Key: $OLYMPUS_API_KEY"get_us_demographics {"county_fips":"06081"}