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Alameda County, CA,

General & Ownership Information
(510) 272-3787

Business Personal Property:
(510) 272-3836

Our business hours are from 8:30AM to 5:00PM Monday through Friday except for holidays


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Assessor's Functions

As mandated by the California Constitution, the primary purpose of the Assessor is to accurately determine the taxable value of all land, improvements, and business and personal property located in Alameda County.

The Assessor’s staff:

  • Locates and identifies the ownership of all taxable property in Alameda County
  • Determines the taxability of all property
  • Determines if property is subject to reappraisal at fair market value when it changes ownership
  • Determines if property that undergoes new construction or alteration is subject to reappraisal
  • Annually assesses all real estate in accordance with the California Constitution (Proposition 13)
  • Annually assesses all taxable business personal property at its fair market value
  • Determines and applies all legal exemptions
  • Surrenders an accurate assessment roll to the Auditor-Controller’s Office prior to July 1st

Contrary to popular opinion, the Assessor:

  • Does not compute property tax bills.
  • Does not collect property taxes.
  • Does not establish property tax laws.
  • Does not set rules by which property is appraised.

Related County Offices

Department Telephone Number Website
Treasurer-Tax Collector (Tax bills and payment information) (510) 272-6800
Auditor-Controller (Tax rates) (510) 272-6564
Clerk-Recorder (Deed recording
(510) 272-6363
Clerk, Assessment Appeals Board
(Information on filling Application for Changed Assessment)
(510) 272-6352

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