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.
Sonoma County formal appeal application and hearing resources. An appeal addresses the specific assessment and enrolled year; another year may require another application.
Assessment appeals — Obtain and complete the county appeal application
Download the Assessment Appeal Application and Instructions or request a copy from the Assessment Appeals Board:
Agent source review: October 15, 2026 · Snapshot 0b59beb1fb70f2a8
Official state service profiles
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