San Mateo County Assessor – Property Records, Parcel Lookup, APN Search & Tax Info | California

by

All Links Verified — April 2026
San Mateo County, California (650) 363-4500 Updated: April 2026
Free Property Search
APN Lookup
GIS Parcel Maps
No Login Required
Property Search GIS Parcel Map Pay Property Tax Call Assessor

San Mateo County Assessor Property Search

San Mateo County property records help you verify ownership, check assessed value, find parcel numbers (APN), review tax history, and confirm land details before buying, selling, or investing. Using the official San Mateo County Assessor website ensures accurate and legally reliable data.

How to Search Property Records (Step-by-Step)

  1. Go to the official San Mateo County Assessor website
  2. Select property search option
  3. Enter APN, address, or owner name
  4. Review property details (value, owner, land use)
  5. Open full record and download if needed
Pro Tip: In San Mateo County, using APN gives the most accurate results. Address searches may show multiple units or partial matches.

Search Methods You Can Use

  • APN Lookup: Best for exact property identification
  • Address Search: Useful for quick lookup
  • Owner Name: Find all properties owned by a person
  • GIS Map: Visual parcel boundary search

San Mateo County Assessor Office Contact

DetailInformation
OfficeSan Mateo County Assessor
Address555 County Center, Redwood City, CA 94063
Phone(650) 363-4500
WebsiteOfficial Website
HoursMon–Fri 8 AM – 5 PM

San Mateo County Property Tax Records

You can check property tax bills, due dates, and payment history through the official Treasurer-Tax Collector portal.

→ Pay Property Taxes Online (Official)

Important: Under California Proposition 13, property tax increases are capped at 2% annually unless ownership changes.

APN (Parcel Number) Guide

The Assessor’s Parcel Number (APN) is a unique ID assigned to each property.

  • Found on tax bill or deed
  • Required for legal and tax purposes
  • Used in GIS and assessor search tools

GIS Map & Parcel Viewer

The GIS system allows you to visually explore parcels, zoning, aerial imagery, and land use.

→ Open San Mateo County GIS Map

Property Tax Exemptions

Homeowner Exemption: Save up to $7,000 in assessed value
Apply Here
Disabled Veteran Exemption: Additional tax relief for qualified veterans
Senior Benefits: Property tax relief and transfer benefits available

Appeal Property Assessment

  1. Check your assessed value
  2. Compare with market value
  3. File appeal with Assessment Appeals Board
  4. Attend hearing if required

Buyer’s Checklist (Before Purchasing Property)

  • Verify ownership
  • Check tax dues
  • Review assessed value
  • Confirm zoning via GIS
  • Check exemptions
  • Review sales history
  • Check for liens
  • Verify parcel boundaries
  • Understand Prop 13 impact

Official Resources

ResourceLink
AssessorVisit
GIS MapOpen
Tax CollectorPay Taxes
RecorderRecorder Office
CA BOEState Resource

Frequently Asked Questions

How do I find my APN in San Mateo County?

You can find your APN on your property tax bill or by using the official Assessor search tool. Enter your address to retrieve parcel details.

How can I check property taxes in San Mateo County?

Visit the Tax Collector website, enter your parcel number, and view or pay your tax bill online securely.

Is San Mateo County property search free?

Yes, the official Assessor and GIS tools are free to use and do not require account registration.

Can I search property by owner name?

Yes, the assessor portal allows owner name search, but results may vary depending on formatting.

What is Proposition 13?

Proposition 13 limits property tax increases in California to 2% per year unless ownership changes or new construction occurs.

Leave a Comment