This page helps users complete a property search in San Mateo County, California by using official county property map and Assessor resources. It explains how to search by address or APN, find assessor maps, and contact the right office for help.
The main online tool is the San Mateo County Property Maps Portal, which provides access to county land layers and scanned parcel map documents maintained by Public Works and the Assessor’s office.
Property Maps Portal property search
Use the search the Property Maps Portal option when you need parcel map information for a San Mateo County property.
Have one of these search details ready before you begin:
- Property address
- Assessor’s Parcel Number, also called APN
The portal supports separate parcel searches by address and by APN.
- Open the Property Maps Portal.
- Select the HOME tab.
- Choose Find parcels by ADDRESS or Find parcels by APN.
- Enter the address or APN.
- Select Search.
- Use the Assessor Map link or All Available Recorded Maps link to retrieve available map documents.
Assessor maps and recorded maps
The ACRE Assessor Maps page explains how to download Assessor’s maps and recorded maps, including subdivision maps and parcel maps, for free online.
For map searches, users can work from parcel details or from map document references:
- Search by address to find parcel-related assessor and recorded map links.
- Search by APN to retrieve assessor maps or all available recorded maps for a parcel.
- Search Assessor Maps by book and page number from the PROPERTY MAPS tab.
- Search recorded maps by volume and page number under Parcel Maps or Subdivision Maps.
Official copies are available at the County Recorder Division during regular business hours and may be printed there for a fee.
Assessor property records
The San Mateo County Assessor determines the assessed value of taxable property in the county. The Assessor Division creates the local assessment roll, shares it with the County Controller and Tax Collector, and makes it publicly available.
The local assessment roll is built through identifying, mapping, inspecting, and calculating the assessed value for real property and business property. A copy of the Local Assessment Roll is available for public inspection at the Assessor Division front counter.
Assessment data fees
The county lists several assessment data and map copy fees for users who need more than an online map view:
| Item | Fee |
|---|---|
| Assessment Appeals Board file, digital copy of appeal documents and status | $305.00 |
| Assessment Roll Master digital copy for secured or unsecured properties, fixed ASCII text | $305.00 |
| Assessment Roll Master digital copy for secured or unsecured properties, PDF | $120.00 |
| Assessor’s Map photocopy | $2.00, plus $1.00 to certify |
| Property Characteristics | $305.00 |
| Property Sales History | $305.00 |
Property search contacts
Use these ACRE contacts for assessor, mapping, and map-copy questions related to San Mateo County property records.
-
Assessor Division, 555 County Center, 1st floor, Redwood City, CA 94063
Phone: (650) 363-4500
General Information: [email protected]
Business Personal Property Valuation: [email protected] -
County Clerk-Recorder, 555 County Center, 1st floor, Redwood City, CA 94063
Copies of Deeds and Maps: (650) 363-4500
County Recorder Email: [email protected]
Common questions
Where can I search San Mateo County property maps online?
Use the San Mateo County Property Maps Portal to search parcels by address or APN and retrieve available assessor or recorded map links.
Can I download assessor maps for free?
Yes. The Assessor Maps information states that Assessor’s maps and recorded maps, including subdivision maps and parcel maps, can be downloaded online for free.
How do I search if I only have a book and page number?
Use the PROPERTY MAPS tab in the Property Maps Portal. For assessor maps, choose Assessor Maps and enter the book and page number. For recorded parcel or subdivision maps, use the volume number and page number.
Where can I get an official map copy?
Official copies are available through the County Recorder Division at 555 County Center, 1st floor, Redwood City, CA 94063 during regular business hours, Monday through Friday, 8 a.m. to 5 p.m.
Who handles assessed property value information?
The San Mateo County Assessor determines assessed values, creates the local assessment roll, and makes the roll available for public inspection at the Assessor Division front counter.