Assessor
County instructions for Assessor parcel information, value notices and maps, with separate third-party and ActiveMap options. Name searches are unavailable; ActiveMap’s listed zoning and land-use details apply to unincorporated areas.
- Availability · Online ownership privacy
- Search by parcel number or address. Owner-name searches and owner names in results are unavailable.
Source & saved evidence
Sonoma County official service / referred provider · Sonoma — property query (opens in a new tab)
County property lookup — Online ownership privacy
Searches by name are not available and the search results will not include owner name.
Agent source review: October 15, 2026 · Snapshot
d79d607029dd4c97 - Availability · Value-change notices — delivery
- The county says assessed-value-change and Prop 8 notices are available online and are no longer mailed unless specifically requested.
Source & saved evidence
Sonoma County official service / referred provider · Sonoma — property query (opens in a new tab)
County property lookup — Value-change notices — delivery
the Assessed Value Change Notices and Prop 8 Notices will no longer be mailed through the U.S. Postal Services unless specifically requested.
Agent source review: October 15, 2026 · Snapshot
d79d607029dd4c97 - Availability · ActiveMap zoning and land-use coverage
- The listed zoning and land-use information is for unincorporated Sonoma County. Confirm city information with the appropriate city.
Source & saved evidence
Sonoma County official service / referred provider · Sonoma — property query (opens in a new tab)
County property lookup — ActiveMap zoning and land-use coverage
Zoning and Land Use codes, Groundwater Availability, Supervisorial District, Williamson Act Land Contract, etc. (unincorporated areas only)
Agent source review: October 15, 2026 · Snapshot
d79d607029dd4c97
Source & saved evidence
Sonoma County official service / referred provider · Sonoma — property query (opens in a new tab)
County property lookup — Parcel information — Assessor query, maps and notices
Search results include Assessor Parcel Number lookup, basic parcel information, value notices and parcel maps
Agent source review: October 15, 2026 · Snapshot d79d607029dd4c97
County-linked Assessor query for parcel information, value notices and maps.
Source & saved evidence
Sonoma County official service / referred provider · Sonoma — property query (opens in a new tab)
County property lookup — Open the Assessor parcel-information query
Search Assessor's Parcel Information Now
Agent source review: October 15, 2026 · Snapshot d79d607029dd4c97
County-linked ActiveMap viewer collection. The listed zoning and land-use coverage is limited to unincorporated areas.
Source & saved evidence
Sonoma County official service / referred provider · Sonoma — property query (opens in a new tab)
County property lookup — Open ActiveMap GIS resources
Search an interactive map with a large choice of geographic, detailed and general map data for the unincorporated areas of Sonoma County.
Agent source review: October 15, 2026 · Snapshot d79d607029dd4c97
- Phone
- (707) 565-1888
- Address
- 585 Fiscal Drive Room 104F Santa Rosa, CA 95403
- Hours
- Monday – Tuesday 8:00 AM – 5:00 PM Wednesday 8:00 AM – 4:00 PM Thursday – Friday 8:00 AM – 5:00 PM Note: No fee transactions or document processing within 30 minutes of closing