San Mateo County, California property search
Search an address or an owner in San Mateo County, California with the box at the top of the map, or tap a lot, for its owner, lines and acreage. 235,344 lots are mapped here, covering 341,140 acres. 18,527 of them are held by institutions rather than by individuals.
Farmers and landowners in San Mateo County received $1.8 million in federal farm program payments in 2025, paid to 10 recipients. 862 acres of agricultural land here are disclosed as foreign-held, the most by owners from Japan. Crop insurance paid $42,000 in claims for the 2024 crop year.
- 235,344
- Lots mapped
- 341,140
- Acres
- 18,527
- Institutional
Largest landowners in San Mateo County
Largest landowners by acreage in San Mateo County, California| Owner | Parcels | Acres |
|---|
| CITY & CO OF S F WATER DEPT & ATTN REAL ESTATE DIRECTOR | 251 | 19,806 |
|---|
| COUNTY OF SAN MATEO & ATTN: REAL PROPERTY DIV. | 219 | 8,595 |
|---|
| STATE OF CALIF | 58 | 6,972 |
|---|
| REDTREE PARTNERS LP | 37 | 4,939 |
|---|
| STATE OF CALIF LAND COMMISSION | 20 | 3,969 |
|---|
| MIDPENINSULA REGIONAL & OPEN SPACE DISTRICT | 42 | 3,626 |
|---|
| STATE OF CALIFORNIA & ATT PARKS & RECREATION | 26 | 3,576 |
|---|
| MIDPENINSULA REG OPEN SPACE DIST & DRISCOLL RANCHES LLC LESSEE & ATTN M WILLIAMS | 10 | 3,081 |
|---|
| SAN GREGORIO LAND LLC | 6 | 2,230 |
|---|
| BIG CREEK TIMBER CO LLC | 19 | 1,954 |
|---|
Companies, trusts and public agencies, ranked by acres held under the name on the assessor's file. Private individuals are not ranked. Largest landowners in California
Federal farm payments in San Mateo County
- $1.8M
- Paid in 2025
- 10
- Recipients
Federal farm program payments by program in San Mateo County, California, 2025| Program | Paid |
|---|
| Marketing Assistance for Specialty Crops | $1.8M |
|---|
| Emergency Livestock Relief Program 2023-24 | $6K |
|---|
USDA Farm Service Agency payment files, 2025. Compare farm subsidies by county
Foreign-held farmland in San Mateo County
- 862
- Acres disclosed
- 1
- Holdings
Foreign-held agricultural land by country in San Mateo County, California, 2024| Country | Acres |
|---|
| Japan | 862 |
|---|
Largest disclosed holders
Largest foreign holders of agricultural land in San Mateo County, California| Holder (country) | Acres |
|---|
| HALF MOON BAY HERITAGE CO., LTD. (JAPAN) | 862 |
|---|
USDA Agricultural Foreign Investment Disclosure Act filings, holdings at the end of 2024. Only disclosed interests are counted. See foreign-owned farmland by county
Crop insurance in San Mateo County
- 8
- Policies
- 997
- Insured acres
- $42K
- Claims paid
- 0.74
- Loss ratio
Crop insurance claims by crop in San Mateo County, California, 2024| Crop | Claims |
|---|
| All Other Crops | $42K |
|---|
USDA Risk Management Agency Summary of Business, 2024 crop year.
Conservation and the power grid
- 52
- Substations
- 230 kV
- Highest voltage
Conservation Reserve Program acres under contract (USDA FSA). Substations in service, from a public copy of the federal HIFLD layer.
Find out who owns a property in San Mateo County by address, free, or work out a lot's acreage.
This copy of San Mateo County's records was taken on August 12, 2026. Assessment records, not a survey.