California note
Alameda County property tax questions start with value or payment
Alameda County property tax questions usually split between the Assessor for value and records, and the Treasurer-Tax Collector for bills and payments.
In Alameda County, property tax errands get easier when you split the question in two: value or payment.
The Assessor side is about the property record. That includes assessed value, owner details, parcel details, exemptions, maps, and other record questions tied to the assessment.
The Treasurer-Tax Collector side is about the bill. That includes paying secured, supplemental, or unsecured property taxes. It also includes bill lookup, tax-defaulted property, and payment questions.
This split matters after buying a home. It also matters when you get a supplemental bill, check a parcel, change a mailing address, or help a family member. A tax bill can feel like one piece of paper. Two offices may still touch it.
Start with the paper in front of you. If the question is why the value or owner record looks that way, begin with the Assessor. If the question is how to pay, replace, or track the bill, begin with the Treasurer-Tax Collector.
Where to see it
Alameda County Assessor and Treasurer-Tax Collector property tax pages.
Official sources
Official pages
Reviewed July 3, 2026
Current rules, forms, fees, deadlines, maps, and office instructions.
Rules, forms, fees, deadlines, and office procedures can change. Check the current page before you file, pay, or rely on a date.
Connected places
Open the local directory
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