California · FIPS 06081 · County seat: Redwood City
San Mateo County, CA GIS & Parcel Viewer
San Mateo County, California parcel data lives on the San Mateo County parcel map. Open it below in a new tab, then use the short steps on this page to find a property fast.
Open the San Mateo County parcel map ↗
Opens gis.smcgov.org in a new tab. We link out and never embed or copy parcel data.
San Mateo County at a glance
| Official map | San Mateo County parcel map |
|---|---|
| Type | County-run map |
| Website | gis.smcgov.org |
| Access | Free, no login (checked Oct 2026) |
| County seat | Redwood City |
| Population | 726,353 (2023 Census Bureau estimate) |
| Land area | 449 sq mi |
| FIPS code | 06081 |
Who runs this map
San Mateo County runs this viewer (directly or through a contracted vendor), which makes it the closest thing to the source for local parcel lines. Our October 2026 check found the map open to the public, with no account or payment needed.
How to use the San Mateo County viewer
- Press the button above to open the county's own web map.
- Search for the property or pan and zoom to it.
- Click the lot to bring up what the county publishes about it.
- Look for print or measure tools if you need a quick map or rough size.
If an address search comes up empty, try the parcel number from a tax bill or deed instead, or click the lot on the map.
The county in brief
Census Bureau figures put San Mateo County at about 726,353 people (2023 estimate) on roughly 449 square miles of land, which is about 1,618 residents per square mile. By population it ranks 15th of 58 counties in California. Another 292 square miles of water fall within its lines, according to Census mapping. Redwood City serves as the county seat.
Nearby parcel maps
San Mateo County shares a border with the counties below. Each link has its own official map:
A note on accuracy
Online parcel lines are drawn for tax and planning use. They can be off by several feet, so use a recorded plat or a licensed surveyor for fences, setbacks or a sale.