San Mateo County GIS Maps
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San Mateo County, California, has 764,442 residents and covers 448.6 square miles. The population grew 6.4% between the 2010 and 2020 census. More residents moved in than left over that decade. The FIPS code for San Mateo County is 06081.
San Mateo is the county's largest population center. San Mateo County also includes 30 zip codes, 3 public school districts and 8 municipalities. Those boundaries help explain why population, schools, and housing can look different from one part of the county to another. The map below shows how those county lines, zip codes, and school districts fit together, and the sections that follow use that same geography to show population, demographics, school enrollment and housing patterns in more detail.
Maps, GIS layers and sample data. Paid packages add full layers, analytics and database files.
San Mateo County Trends
- Population
- 764,442▴
- Median Home Value
- $1,494,500▴
- K-12 Enrollment
- 10,464▾
County analytics dashboards with historical trends & projections included in package downloads.
Free starter access previews county maps, lightweight GIS, and sample data. Paid packages unlock full GIS layers, analytics, and database files.
San Mateo County Maps
The maps below show a few of the county map styles included in our downloads. County packages include map exports in JPEG, PNG, SVG, PDF and GeoTIFF formats plus more than 20 GIS layers for mapping, research and analysis. Available layers include zip codes, area codes, subdivisions, school districts, political boundaries, roads, water features, points of interest and more.
County packages also include historical county demographics, business intelligence, analytical dashboards, AI-ready prompts, markdown files and related reference data. Everything is organized to save hours of manual work collecting current data, cleaning it and joining it together. That makes it easier to move faster on analytics, due diligence, business planning and location research. Paid packages are built for commercial use, but some package contents include source-specific attribution or notice guidance. Review Licensing & Data Source Notices.
San Mateo County Population
San Mateo County had 764,442 residents in 2020. That was 6.4% higher than in 2010. San Mateo County added 57,281 people between 2000 and 2020, which points to steady long-term growth. San Mateo is the largest city in the county, but it accounts for only about 14% of the total population. The county is fairly spread out, with about 1,704 people per square mile. Some of the county's most populated postal areas include South San Francisco, Daly City and Daly City.
Population Trend in San Mateo County CA
San Mateo County Population per 2000, 2010 and 2020 census counts with a baseline 2030 projection.
San Mateo County Zip Codes
San Mateo County has 30 zip codes. Some of the county's most populated zip codes include South San Francisco (94080), Daly City (94015) and Daly City (94014). South San Francisco is the largest zip by population, with about 66,592 residents or 9% of the county total. Together, the three largest zips account for about 23% of all county residents based on 2020 population estimates.
Most Populated Zip Codes in San Mateo County CA
| ZIP | Area | Population | Trend |
|---|---|---|---|
| 94080 | South San Francisco | 66,592 | ▴ 4.1% |
| 94015 | Daly City | 63,489 | ▴ 4.2% |
| 94014 | Daly City | 48,677 | ▴ 3.5% |
| 94403 | San Mateo | 45,057 | ▴ 13.7% |
| 94066 | San Bruno | 44,147 | ▴ 7.3% |
| Download all zip code data | |||
San Mateo County Zip Code populations and trends per most recent census data.
San Mateo County Demographics
San Mateo County has a median age of 40.6, which makes the county a little older than California overall. About 19.9% of residents are under 18, while 17.3% are 65 or older. That gives the county a fairly even mix of younger families and older adults. The largest age group is 25 to 44 at about 35.7% of the population, which points to a solid working-age base. About 53.1% of adults have a bachelor's degree or higher, above the statewide figure of 36.5%. The county has a more diverse population mix, with no single race or ethnicity accounting for all of the local story.
Key Demographics for San Mateo County CA
Median Age
40.6
Under 18
19.9%
Age 65+
17.3%
Bachelor's+
53.1%
San Mateo County School Districts
San Mateo County is served by 3 public school districts with 10,464 students enrolled in 2024. The largest districts on the county map are South San Francisco Unified, Cabrillo Unified and La Honda-Pescadero Unified. Those three districts account for about 100% of public school enrollment in the map area. Total enrollment has stayed fairly steady in recent years, but it is slightly lower than it was in 2017.
Largest School Districts by Enrollment in San Mateo County CA
| District | Enrollment | Share | Trend |
|---|---|---|---|
| South San Francisco Unified School District | 7,644 | 73.1% | ▾ -1.5% |
| Cabrillo Unified School District | 2,548 | 24.4% | ▾ -3.6% |
| La Honda-Pescadero Unified School District | 272 | 2.6% | ▴ 5% |
| Download all school district data | |||
San Mateo County school district enrollment and trends per most recent NCES reporting data.
San Mateo County Housing & Real Estate
San Mateo County has a median home value of $1,494,500 and a median gross rent of $2,893. About 59% of occupied homes in the county are owner-occupied, so the local housing market leans heavily toward ownership. Home values run above the California median, while rents come in above the state average. In March 2026, the median listing price was $1,577,982 and homes spent about 24 days on the market.
San Mateo County Housing Mix
San Mateo County housing mix: owner, renter and vacant units.
San Mateo County Housing Trends
San Mateo County median home value and rent trend (last 5 years).
Businesses in San Mateo County, CA
San Mateo County has 27,235 business listings across 1,131 categories. The largest categories in San Mateo County business listings are Real Estate Agents (557, 2.0%), Auto Repair (500, 1.8%), and Parks & Recreation (446, 1.6%). The full San Mateo County business listings dataset includes names, categories, addresses and contact details where available. San Mateo County packages also include U.S. Census County Business Patterns data with establishment counts, employment and payroll by industry sector.
Top Business Categories in San Mateo County, CA
| Category | Businesses | Share |
|---|---|---|
| Real Estate Agents | 557 | 2.0% |
| Auto Repair | 500 | 1.8% |
| Parks & Recreation | 446 | 1.6% |
| Dental Offices | 424 | 1.6% |
| Churches & Religious Organizations | 365 | 1.3% |
| Beauty Salons | 338 | 1.2% |
| Hair Salons | 333 | 1.2% |
| Medical Offices | 293 | 1.1% |
| Landmark And Historical Building | 289 | 1.1% |
| Community & Nonprofits | 277 | 1.0% |
San Mateo County Business Listings
| Business | Category | City |
|---|---|---|
| Bigfoot Tees | 3D Printing Service | Belmont |
| Our Common Ground Inc | Abuse And Addiction Treatment | East Palo Alto |
| Bookstore - Skyline College | Academic Bookstore | San Bruno |
| eaves Foster City | Accommodation | Foster City |
| L. Lopez, CPA & Associates | Accountant | Redwood City |
| 1v1 Training | Active Life | Belmont |
| ACM Health Center | Acupuncture | San Mateo |
| Addiction Rehab San Bruno | Addiction Rehabilitation Center | San Bruno |
| Powerspeaking | Adult Education | Redwood City |
| Galleri | Adult Entertainment | South San Francisco |
| Download San Mateo County business listings | ||
San Mateo County business listings sourced from Overture Maps. Includes locations with a high level of confidence.
San Mateo County Basemaps
San Mateo County map and data packages include a set of useful basemaps to help you get started quickly. These include a custom light grey canvas, USGS topo, imagery and other reference layers that make it easier to build clear, meaningful county maps using the included GIS layers, your own data or both. Pre-rendered map tiles for the light grey basemap are included so you can use them offline or host them on your own CDN.
Get the Full San Mateo County Data Package
This page shows a preview of what's included in the San Mateo County data package. The full package gives you a ready-to-use county data system with GIS layers, historical data, maps, database files and planning tools that save hours of manual data gathering, cleanup and joins. Everything is organized to help you skip data wrangling and start analysis faster.
- 20+ GIS layers for zip codes, school districts, roads, water, boundaries and more
- Historical county demographics, housing, income and trend data
- ZIP code population files and school district enrollment history
- Database files, markdowns, AI-ready prompts and documentation
- Map exports in PNG, JPEG, PDF, SVG and GeoTIFF formats
- Offline-ready data explorer, map and analytics tools
Paid packages support commercial use, client work, and derived outputs. Some package contents may include source-specific attribution or provider notices. See Licensing & Data Source Notices.
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Nearby Counties
Browse county data pages for the counties that border San Mateo County. These nearby pages include the same mix of county maps, demographic summaries, school district context, housing trends and package links.