About Us
About the Alameda County Assessor’s Office
The Alameda County Assessor’s Office is responsible for locating all taxable property in the county, establishing its assessed value, identifying ownership, and applying any legal exemptions. With over $451 billion in total assessed value, the Alameda County Assessor’s Office is one of the largest assessment agencies in the State of California.
The work of our office helps generate revenue for Alameda County, its 14 cities, and six unincorporated communities. These funds support critical public services including schools, public health, social and family support services, fire and police departments, road maintenance, and neighborhood improvements.
Our Mission
We provide equitable, accurate, and timely property tax assessments while delivering excellent customer service to the people of Alameda County.
Our Values
- Accuracy — Fair and consistent property valuations based on California law
- Transparency — Open access to assessment information and clear communication
- Service — Responsive, helpful assistance for property owners and the public
- Innovation — Modernizing systems with e-Forms, digitized records, and improved online tools
Quick Links
- Meet the Assessor — Learn about Assessor Phong La, his biography, and the Assessor’s responsibilities
- Visit or Contact Us — Office locations, hours, phone, and email
- Leave a Suggestion — Help us improve our services
Contact Us
Phone: (510) 272-3787 | Toll Free: (800) 660-7725
Email: AssessorWebResponse@acgov.org
Main Office: 1221 Oak Street, Room 145, Oakland, CA 94612
Dublin Satellite Office: 7600 Dublin Blvd, #270, Dublin, CA 94568
Public Lobby Hours: 9:00 AM to 4:30 PM, Monday through Friday (except holidays)