Alameda County Assessor Property Search, APN Lookup & Tax Records 2026
An Alameda County property search may begin with an Oakland condominium, Berkeley duplex, Fremont home, Hayward commercial parcel, Livermore acreage, Dublin subdivision, unincorporated Castro Valley property, tax bill, trust transfer, deed, or supplemental assessment notice. The correct answer is usually spread across separate Assessor, Treasurer-Tax Collector, Clerk-Recorder, parcel-map, planning, and appeals systems. This guide shows the safe order in which to use them.
Quick Answer: How to Search Alameda County Property Records
Use the official Alameda County Property Search when you know the Assessor Parcel Number or property address. The current public search offers parcel-number, type-ahead address and property-address fields. Its APN example uses the format 123-345-67.
Owner names are not displayed in the normal online property search. Limited ownership information may be requested by phone, obtained in writing for a fee, or viewed free at the Assessor’s public kiosk. Use the Tax Collector portal for bills and payments, and use the Clerk-Recorder’s Official Public Records system for deeds, liens and recorded documents.
Alameda County Record Route Builder
Select the task you need to complete and see which official system normally handles it.
Your official route will appear here
Select the task that best matches your question.
Important: Planning help only. Not an official tax bill, legal survey, title report, appraisal decision, exemption approval or government determination.
APN and Address Search Preparation Tool
Use this before opening the county search so you know which identifier and backup records to prepare.
Search checklist
Select the information you have and the record you need.
Important: This tool does not access county databases or verify a parcel, owner, value, tax balance or boundary.
Alameda County Supplemental Tax Planning Estimator
Estimate a possible supplemental tax amount after a purchase, ownership change or new construction.
Supplemental planning result
Enter the new and prior assessed values to estimate the taxable value difference.
Important: Estimate only. Not an official tax bill, escrow calculation, assessed value, exemption decision or payment amount.
Who This Alameda County Property Guide Is For
Check the APN, assessed value, parcel map, Homeowners’ Exemption, mailing address, supplemental assessment and decline-in-value options.
Compare the Assessor record, tax account, Recorder documents, parcel map, local permit system, zoning and possible supplemental taxes.
Confirm the unit number, APN, deed, tax bill and homeowners association documents rather than relying on the building address alone.
Review assessed value, supplemental bills, recorded documents, business property, local rent rules and permit records through the correct agencies.
Use the Recorder for deeds and the Assessor for ownership statements, exclusions, Proposition 19 and reassessment questions.
Business personal property, fixtures, boats, aircraft and possessory interests may use unsecured accounts instead of the normal secured parcel workflow.
Alameda County Assessor Quick Facts
| Item | Current Verified Detail | Official Next Step |
|---|---|---|
| Official office | Alameda County Assessor’s Office | Open the official Assessor website |
| County Assessor | Phong La | Verify current officeholder information before formal correspondence. |
| Main office | 1221 Oak Street, Room 145, Oakland, CA 94612 | Use for Assessor public counter, records kiosk and general real-property questions. |
| Dublin Assessor office | 7600 Dublin Boulevard, Suite 270, Dublin, CA 94568 | Provides full Assessor services for East and South Alameda County. |
| Main phone | (510) 272-3787 | Call the Assessor |
| Toll-free phone | (800) 660-7725 | Call toll-free |
| Lobby hours | Monday–Friday, 9:00 AM–4:30 PM, except holidays | Verify holiday closures before visiting. |
| Public property search | Parcel number or property address | Open Alameda County Property Search |
| Online owner names | Not displayed on the public Assessor website | Review official ownership request options |
| Tax bills and payment | Alameda County Treasurer-Tax Collector portal | Open the tax portal |
| Recorder office | 1106 Madison Street, Oakland, CA 94607 | Review Clerk-Recorder services |
| Regular appeal period | July 2 through September 15 | Verify current application, fee and deadline before filing. |
How to Use the Official Alameda County Property Search
The official search currently provides three public search modes: parcel number, type-ahead address and property address. It does not list owner name as a normal online search option.
Enter the APN as shown on the tax bill. The search page gives an example format of 123-345-67.
Begin typing the physical property address and choose the correct suggestion instead of relying on an unconfirmed free-text match.
Check the street address, APN, assessed land and improvement values, parcel map and related property information.
Use the Treasurer-Tax Collector for bills, the Recorder for deeds, and the applicable city or county planning department for zoning and permits.
What to Do When Address Search Returns No Result
How to Find Alameda County Property Ownership Information
Ownership information is part of the public assessment roll, but Alameda County does not display owner names online because of privacy and statutory address-protection concerns.
| Ownership Method | What the County Provides | What You Need |
|---|---|---|
| Telephone | Limited ownership information for a small number of parcels | Property address or parcel number; call (510) 272-3787 during 9:00 AM–4:30 PM phone hours. |
| Public kiosk | Ownership information free of charge at the Assessor’s public counter | Visit 1221 Oak Street, Room 145, Oakland during normal lobby hours. |
| Written request | Written ownership information for a fee | Call the Assessor for current fee and submission instructions. |
| Recorder documents | Recorded deeds and transfers indexed by the names appearing on the document | Grantor/grantee name, approximate recording date, document type or document number. |
| Title professional | Not a county service, but appropriate for insured title conclusions | Property address, APN and transaction information. |
Review Alameda County’s official ownership-information policy
Alameda County APN Format, Parcel Changes and Map References
An Assessor Parcel Number identifies a parcel for assessment and tax administration. Alameda County’s public search gives 123-345-67 as an example format.
| APN Issue | What It Means | Best Action |
|---|---|---|
| APN on tax bill | The parcel identifier associated with that bill and roll year | Enter it exactly in the Assessor and tax portals. |
| New subdivision | A recorded subdivision may create new parcel numbers | Ask when the new APNs will become effective. |
| Parcel combination | Multiple parcels may be combined for assessment after required approvals and processing | Compare prior APNs with the current tax roll and recorded documents. |
| Boundary adjustment | A recorded lot-line adjustment or map may change parcel configuration | Use the recorded map and ask the Assessor about the effective roll year. |
| May–June processing delay | Parcel-map processing may pause during annual tax-roll preparation | Allow additional time and confirm status before relying on a pending APN. |
Local Search Tips Across Oakland, Berkeley, Fremont, Hayward and the Tri-Valley
A building address may contain many separately assessed units. Match the APN, legal unit description, deed and tax bill.
Several dwelling units may share one parcel and one Assessor record. Rental, zoning and permit questions belong to separate local agencies.
New construction can produce an added assessment even when the original land value remains unchanged. Check permits with the responsible city or county office.
Land and buildings may appear on the secured roll, while fixtures and business personal property may be assessed through an unsecured account.
The Assessor’s Dublin satellite office offers full services for East and South Alameda County at Suite 270.
Castro Valley, San Lorenzo, Ashland, Cherryland, Fairview, Sunol and other unincorporated areas may use county planning rather than a city permit office.
Alameda County Property Tax Search, Payment Fees and Due Dates
The Assessor determines taxable value but does not compute or collect the final bill. Use the Treasurer-Tax Collector portal for secured, supplemental, delinquent and unsecured tax accounts.
Open the official Alameda County property tax portal
Which Tax Search Should You Choose?
| Tax Type | Typical Property | Search Method |
|---|---|---|
| Secured | Land and improvements secured by real property | Property address or parcel number. |
| Supplemental | Additional assessment after ownership change or completed new construction | Use the secured/supplemental search and match the supplemental bill. |
| Unsecured | Business property, boats, aircraft and certain possessory interests | Use the separate unsecured tax search and account information. |
| Prior-year delinquent | Past-due secured property taxes | Use the portal and confirm redemption or delinquent balance details. |
Current Electronic Payment Fees
| Payment Method | Official Portal Currently States | Before Submitting |
|---|---|---|
| Electronic check | No fee | Confirm routing number, account number, APN, bill type and installment. |
| Credit card | 2.3% convenience fee | Review the final convenience fee and total before authorizing payment. |
| Telephone payment | Available through (510) 272-6800 | Confirm the convenience fee stated by the phone system. |
| Returned payment | Current FAQ lists a $61 returned-check fee | Verify account funds and payment posting before retrying. |
Secured Property Tax Calendar
| Installment | Due | Last Day Without Penalty |
|---|---|---|
| First installment | November 1 | December 10, subject to weekend and legal-holiday rules. |
| Second installment | February 1 | April 10, subject to weekend and legal-holiday rules. |
Alameda County Parcel Maps, GIS Data and Boundary Limits
Assessor parcel maps can show approximate parcel boundaries, APNs, dimensions, acreage, street addresses and map references. They are compiled for assessment purposes and are not legal surveys.
Parcel maps can help match the tax parcel with its map page, dimensions and surrounding parcels.
Review the official parcel-map page and current viewer terms
Alameda County provides geospatial datasets and map resources through its Open Data Hub.
County zoning maps apply to unincorporated areas. Incorporated cities maintain their own zoning and permit systems.
What Parcel Maps Cannot Prove
Alameda County Deeds, Liens, Easements and Official Public Records
The Clerk-Recorder maintains deeds, liens, easements, reconveyances, releases and other recorded real-property documents. Records from 1969 to the present are electronically indexed and may be searched online. Earlier records must be researched in person.
Save the APN, property address and names appearing on the tax bill, deed or title report.
Use grantor, grantee, document type, recording date or document number when available.
Save the instrument number and recording date before ordering a plain or certified copy.
Current Public Record Copy Fees
| Copy Type | Official Page Currently Lists | Use |
|---|---|---|
| Plain copy | $3.50 per page | Reference copy when certification is not required. |
| Certified copy | $4.50 for the first page and $3.50 for each additional page | When an agency, court or transaction requires certification. |
1106 Madison Street, Oakland, CA 94607
Hours: Monday–Friday, 8:30 AM–5:00 PM
Recording cutoff: 4:30 PM
Phone: (510) 272-6362
7600 Dublin Boulevard, Suite 160, Dublin, CA 94568
Hours: Monday–Friday, 8:30 AM–5:00 PM
Recording cutoff: 4:30 PM
Mail transactions are not accepted at this location.
Mailing Address Changes, Exemptions, Proposition 19 and Tax Relief
| Task | Current Official Guidance | What to Prepare |
|---|---|---|
| Change mailing address | Submit the Assessor’s mailing-address change request | APN, owner name, property address, old address, new address and signature. |
| Homeowners’ Exemption | Reduces taxable assessed value by $7,000 for a qualifying principal residence | APN, ownership information, occupancy date and claim form. |
| Timely exemption filing | February 15 is the regular exemption deadline; December 10 is the late-claim deadline listed on the county calendar | File as early as possible and retain proof of receipt. |
| Proposition 19 base-year transfer | May help qualifying homeowners age 55 or older, severely disabled owners and disaster victims | Original and replacement property APNs, sale/purchase dates, eligibility evidence and claim form. |
| Parent-child family transfer | Post-February 2021 transfers follow Proposition 19’s narrower principal-residence or family-farm rules | Recorded transfer, residency evidence, relationship documents and applicable BOE-19 form. |
| Calamity reassessment | County guidance lists at least $10,000 in damage and filing within 12 months | APN, event date, photographs, repair estimates, insurance information and damage description. |
| Disabled Veterans’ Exemption | Available to qualifying veterans rated 100% disabled and certain surviving spouses | Current claim form, VA rating documentation, DD214 and principal-residence evidence. |
Change the mailing address, review exemptions, review Proposition 19, or open Assessor forms.
Decline-in-Value Review and Alameda County Assessment Appeals
If market value on January 1 may be below the Proposition 13 assessed value, an owner may request a free informal Proposition 8 decline-in-value review. The county states that informal requests are available from July 1 through December 31.
Record the APN, land value, improvement value, total enrolled value, notice date and tax year.
Use comparable sales, an appraisal, photographs, repair estimates, income and expense information for relevant commercial property, or evidence of incorrect property characteristics.
Regular assessment appeals must generally be filed from July 2 through September 15. Do not wait beyond the deadline for an informal-review response.
File within 60 days of the notice mailing date or postmark, whichever is later, under the current official instructions.
Current Appeal Application Costs and Requirements
| Appeal Item | Current Official Application States | Important Note |
|---|---|---|
| Application processing fee | $50 non-refundable fee per application | Verify the latest filing packet before submitting because general county pages may use different language. |
| Application copies | File the form in duplicate | Do not attach hearing evidence to the application. |
| Hearing evidence | Bring five copies when the hearing is scheduled | Follow later hearing instructions if they differ. |
| Written findings | $160 per parcel, up to $480 | Optional and normally relevant when judicial review may be considered. |
| Tax payment | Taxes must still be paid by the bill deadline | An appeal does not suspend payment or prevent penalties. |
Open Assessment Appeals Board resources
Decision Table: Which Alameda County Office Handles Your Task?
| If You Need | Correct Office or System | Official Action |
|---|---|---|
| APN, assessed value or address-based parcel search | Alameda County Assessor Property Search | Open Property Search |
| Owner name associated with a parcel | Assessor phone, written request or public kiosk | Review ownership options |
| Current tax bill, payment or penalty | Treasurer-Tax Collector | Open tax portal |
| Deed, lien, easement or recorded map | Clerk-Recorder Official Public Records | Search public records |
| Approximate parcel map | Assessor parcel-map resources | Review parcel maps |
| Zoning or permit information | Applicable city or Alameda County Planning | Open County Planning resources |
| Homeowners’ Exemption, Prop 19 or mailing change | Alameda County Assessor | Open homeowner services |
| Formal assessment appeal | Assessment Appeals Board / Clerk of the Board | Review appeal filing |
Alameda County Assessor Contact Information and Oakland Office Map
Assessor: Phong La
Address: 1221 Oak Street, Room 145, Oakland, CA 94612
Phone: (510) 272-3787
Toll-free: (800) 660-7725
Fax: (510) 272-3803
Email: AssessorWebResponse@acgov.org
Hours: Monday–Friday, 9:00 AM–4:30 PM, except holidays.
Address: 7600 Dublin Boulevard, Suite 270, Dublin, CA 94568
Phone: (510) 272-3787
Hours: Monday–Friday, 9:00 AM–4:30 PM, except holidays.
This location serves East and South Alameda County and is separate from the Recorder’s Suite 160 office.
Documents to Gather Before You Search, Pay, File or Appeal
Common Alameda County Property Search Mistakes
Alameda County does not display owner names through its normal Assessor website search.
Assessor and GIS maps are references, not legal surveys or proof of an encroachment.
The Treasurer-Tax Collector handles tax balances, payments and penalties.
A purchase or completed new construction can produce one or more bills after closing.
File a protective formal appeal when necessary and withdraw it later if the issue is resolved.
The Assessor is Suite 270; the Clerk-Recorder is Suite 160.
Alameda County Property Search Troubleshooting
| Problem | Likely Cause | What to Do Next |
|---|---|---|
| No result by address | Address formatting, unit information, incorrect jurisdiction or new parcel | Use type-ahead search, remove the unit, check the tax bill or search by APN. |
| Owner name is missing | County privacy policy | Call the Assessor, visit the public kiosk or search recorded deeds. |
| Tax payment is not showing | Processing delay, failed transaction, wrong bill type or bank issue | Do not pay twice immediately. Save proof and call (510) 272-6800. |
| Parcel map differs from fence | Map geometry or aerial-image alignment is approximate | Review recorded documents and obtain a licensed survey. |
| Deed cannot be found online | Record predates 1969, name variation or incorrect date range | Search in person or contact the Clerk-Recorder with additional details. |
| Assessment seems higher than market value | Market change, new construction, ownership change, restored Prop 8 value or data issue | Request informal review and preserve the formal appeal deadline. |
| Property is in Castro Valley or San Lorenzo | It may be in unincorporated Alameda County rather than a city jurisdiction | Use County Planning and building resources for zoning or permits. |
What to Save After a Search, Payment, Form or Appeal
Property Search, Payment and Fraud Safety
Avoid websites that imitate the county portal, promise online owner-name access that Alameda County does not provide, guarantee a tax reduction, or demand urgent payment to correct a deed or lien.
Alameda County Property Search: Direct Answers
| Can the official search use an address? | Yes. The public search supports type-ahead address and property-address search. |
| Can the official website search by owner name? | No. Alameda County does not display owner names on the normal Assessor website. |
| Where do I check tax bills? | Use the Alameda County Treasurer-Tax Collector property tax portal. |
| Where do I find deeds and liens? | Use the Clerk-Recorder’s Official Public Records search. |
| Is the parcel map a legal survey? | No. Assessor parcel maps are prepared for assessment purposes only. |
| What is the regular appeal period? | July 2 through September 15. |
| What is the current online credit-card fee? | The official tax portal currently lists a 2.3% convenience fee; electronic check has no fee. |
Official Source Notes
Frequently Asked Questions
How do I search Alameda County Assessor property records?
Use the official Alameda County Property Search and enter the Assessor Parcel Number or property address. The search supports parcel-number, type-ahead address and property-address lookup.
Can I search Alameda County property records by owner name?
Owner names are not displayed on the public Assessor website. Limited ownership information may be requested by phone, obtained in writing for a fee or viewed free at the Assessor’s public kiosk.
How do I find an Alameda County APN?
Check the property tax bill, recorded deed, title report, closing statement or official address search. The public search gives 123-345-67 as an example APN format.
How do I pay Alameda County property taxes online?
Use the official Treasurer-Tax Collector property tax portal. Confirm the parcel, bill type, roll year, installment, amount and payment fee before submitting.
What are Alameda County’s current online payment fees?
The official portal currently states that electronic check payments have no fee and credit-card payments have a 2.3% convenience fee.
When are Alameda County secured property taxes due?
The first installment is due November 1 and is delinquent after December 10. The second installment is due February 1 and is delinquent after April 10, subject to weekend and legal-holiday rules.
Is the Alameda County parcel map a legal survey?
No. Assessor parcel maps are prepared for assessment purposes and cannot establish exact boundaries, easements, corners or encroachments.
How do I find an Alameda County deed or lien?
Use the Clerk-Recorder’s Official Public Records portal. Records from 1969 forward are electronically indexed, while earlier records must be researched in person.
How do I claim the Alameda County Homeowners’ Exemption?
Contact the Homeowners’ Exemption unit at (510) 272-3770 for a property-specific form or use the current general claim form when a filing deadline is approaching.
How do I request a lower Alameda County assessed value?
Submit a free decline-in-market-value review request with January 1 market evidence. Informal reviews are available from July 1 through December 31, but preserve the formal September 15 appeal deadline.
What is the Alameda County assessment appeal deadline?
Regular assessment appeals are generally filed from July 2 through September 15. Supplemental and escape assessment appeals generally must be filed within 60 days of the applicable notice.
Where is the Alameda County Assessor office?
The main office is at 1221 Oak Street, Room 145, Oakland, California 94612. A full-service satellite office is at 7600 Dublin Boulevard, Suite 270, Dublin.
What to Do Next
Start with the APN or property address. Use the Assessor search for parcel and value information, request ownership details separately, use the Treasurer-Tax Collector for the bill, and use the Clerk-Recorder for deeds and liens. Treat parcel maps as references and verify every deadline before filing or paying.