Assessor
Find property assessments, parcel information and property tax exemptions.
Source checked October 12, 2026[1]www.acassessor.org
Opens this office’s own website. CountyWiki does not process applications, take payments or provide personal records.
Contact details & office locations ↓Online services & information
These links were found on official source pages. Each service is handled by the office.
Read the county’s parcel-map guidance, access options and use restrictions before opening its viewer. Assessment maps are approximate and do not establish legal property boundaries.
Before you start
- Availability · Parcel map accuracy and boundaries
- Parcel maps are for assessment purposes, not legal surveys or boundary-dispute determinations. [10]
- Eligibility & access · Parcel Viewer permitted uses
- The county posts restrictions on Parcel Viewer use, including personal matters, political campaigns and profit. Read its full disclaimer before proceeding. [11]
- Processing time · New parcel map processing
- Parcel map processing may pause in May and June for annual roll preparation; this is not a guarantee of completion time. [12]
Official assessor maps and property information. Read the office’s current requirements before continuing.
County-linked viewer for parcel maps and assessment information. The county’s use restrictions and map limitations apply.
Fees
Fees are quoted only when a source document supports the amount and conditions.
Check the official website for its current fee schedule. No fee should be assumed to be free.
Forms & documents
Official forms and document pages for this office’s services.
Sources & last checked3 source pages · 15 citations
Sources were checked by an AI-assisted research process. A checked website does not mean every service or fee on it has been reviewed.
- [1] Alameda County — departments directory (opens in a new tab)
Alameda County · Department directory: Assessor
Source reviewed October 12, 2026View supporting excerpt
Department Website
- [2] Alameda County — assessor (opens in a new tab)
Alameda County · Service link: Look up a parcel
Source reviewed October 12, 2026View supporting excerpt
Look up a parcel
- [3] Alameda County — assessor (opens in a new tab)
Alameda County · Forms/document link: Assessor Forms
Source reviewed October 12, 2026View supporting excerpt
Assessor Forms
- [4] Alameda County — assessor (opens in a new tab)
Alameda County · Forms/document link: FORMS
Source reviewed October 12, 2026View supporting excerpt
FORMS
- [5] Alameda County — assessor (opens in a new tab)
Alameda County · Contact information — phone
Source reviewed October 12, 2026View supporting excerpt
ce 7600 Dublin Blvd, #270 Dublin, CA 94568 Phone Main: (510) 272-3787 Fax: (510) 272-3803 BPP: (510) 272-3836 Boats & Aircraft: (510) 272-3838 Toll Free: (800) 660-
- [6] Alameda County — assessor (opens in a new tab)
Alameda County · Contact information — address
Source reviewed October 12, 2026View supporting excerpt
NESSES MAPS APPEALS FORMS OFFICE LOCATIONS MAIN OFFICE 1221 Oak Street, Room 145, Oakland, CA 94612 Business Personal Property is also handled at this location. Mon-Fri 9:00AM-4:30PM <br /> View
- [7] Alameda County — assessor (opens in a new tab)
Alameda County · Contact information — hours
Source reviewed October 12, 2026View supporting excerpt
ircraft@acgov.org Public Lobby Hours Oakland Offices – 9:00 AM to 4:30PM Monday – Friday except for holidays Dublin Satellite Office – 9:00 AM to 4:30PM Monday through Friday except for holidays Legal /
- [8] Alameda — property query (opens in a new tab)
Alameda County official service / referred provider · County property lookup — Parcel maps and assessment records — instructions
Source reviewed October 15, 2026View supporting excerpt
Assessor Parcel Maps along with assessment and property related data can be accessed through Assessor Parcel Viewer.
- [9] Alameda — property query (opens in a new tab)
Alameda County official service / referred provider · County property lookup — Open the county-linked Parcel Viewer
Source reviewed October 15, 2026View supporting excerpt
Open Parcel Viewer
- [10] Alameda — property query (opens in a new tab)
Alameda County official service / referred provider · County property lookup — Parcel map accuracy and boundaries
Source reviewed October 15, 2026View supporting excerpt
Assessor parcel maps are prepared for assessment purposes only. They are not legal surveys and should not be used to determine exact property boundaries or resolve boundary disputes.
- [11] Alameda — property query (opens in a new tab)
Alameda County official service / referred provider · County property lookup — Parcel Viewer permitted uses
Source reviewed October 15, 2026View supporting excerpt
Prohibited uses include, but are not limited to, uses for political campaigns, personal matters, or profit.
- [12] Alameda — property query (opens in a new tab)
Alameda County official service / referred provider · County property lookup — New parcel map processing
Source reviewed October 15, 2026View supporting excerpt
Please note that parcel map processing may be paused during May and June each year due to annual tax roll preparation.
- [13] Alameda — property query (opens in a new tab)
Alameda County official service / referred provider · Assessor parcel-map questions — main office — phone
Source reviewed October 15, 2026View supporting excerpt
Phone: (510) 272-3787
- [14] Alameda — property query (opens in a new tab)
Alameda County official service / referred provider · Assessor parcel-map questions — main office — address
Source reviewed October 15, 2026View supporting excerpt
Main Office: 1221 Oak Street, Room 145, Oakland, CA 94612
- [15] Alameda — property query (opens in a new tab)
Alameda County official service / referred provider · Assessor parcel-map questions — main office — hours
Source reviewed October 15, 2026View supporting excerpt
Public Lobby Hours: 9:00 AM to 4:30 PM, Monday through Friday (except holidays)