Contra Costa County Assessor Property Search, APN, Tax & GIS Guide 2026
A Contra Costa County property search may begin with a Richmond address, Walnut Creek condominium, Concord tax bill, Brentwood subdivision, San Ramon business, Delta parcel, hillside lot, unincorporated home, trust transfer, or recorded deed. The useful answer rarely comes from one search box. This guide shows how to identify the correct nine-digit APN, check assessed values without relying on an online owner-name search, review every tax bill, distinguish county zoning from city zoning, find deeds and surveys, apply for exemptions, and protect assessment-appeal deadlines.
Quick Answer: How to Search Contra Costa County Property Records
Use the county-linked ParcelQuest Lite service to search by a nine-digit Assessor Parcel Number or street address. The service can display parcel maps, assessed values, and available property characteristics. Vacant land may not have a usable street address, so an APN is usually required.
Contra Costa County does not publish property-owner names through its online Assessor property-information page. For ownership history, deed parties, liens, or recorded documents, use the County Clerk-Recorder’s official property-document service. For parcel location, zoning, aerial imagery, roads, and other map layers, use CCMAP.
What You Can Search Online—and What Requires Another Record
| Information Needed | Best Search Method | Important Limitation |
|---|---|---|
| APN and basic parcel details | ParcelQuest Lite or CCMAP | Verify the selected parcel against a tax bill, deed, or title report. |
| Assessed value and property characteristics | ParcelQuest Lite | Online details depend on data released and maintained by the county. |
| Current property owner name | Latest recorded deed or Recorder index | Owner names are not displayed on the county’s online Assessor property-information page. |
| Tax amount due and payment history | Treasurer-Tax Collector portal | Pending payments or corrections may not appear immediately. |
| Zoning and land-use information | CCMAP plus the responsible planning department | County zoning layers apply to unincorporated areas; incorporated cities administer their own zoning. |
| Exact boundary or easement rights | Recorded map, title report, deed, and licensed surveyor | Online parcel lines are not a legal survey or title guarantee. |
Contra Costa APN Formatter and Search Planner
Enter the APN from a bill, deed, title report, or map result. The helper removes extra characters and creates a standard nine-digit display.
Your APN search plan will appear here
A Contra Costa County APN generally contains nine digits, commonly displayed in three groups such as 155-280-015.
Important: This helper does not access county records and cannot confirm that an APN belongs to the intended property.
Which Contra Costa County Office Handles Your Task?
Choose the problem you are trying to solve. The result identifies the appropriate first office and the information to gather.
Your office result will appear here
Select a task to see whether the Assessor, Tax Collector, Clerk-Recorder, Public Works, city planning department, County planning department, Auditor-Controller, or Assessment Appeals Board is the correct first step.
Important: Planning help only. Not an official record, tax bill, legal survey, title opinion, approval, or legal advice.
California Supplemental Property Tax Estimator
Use this planning calculator after a purchase, ownership change, or completed new construction that may increase the assessed value.
Estimated supplemental amount
Enter the prior value, expected new value, estimated rate, and a planning period.
Important: Estimate only. It is not an official tax bill and does not include every direct charge, exemption, adjustment, or supplemental period.
Who This Contra Costa County Property Guide Helps
Find the APN, check assessed value, verify homeowners’ exemption status, understand special charges, and request a value review.
Compare ParcelQuest, CCMAP, tax history, deeds, liens, recorded maps, city or county zoning, and potential supplemental bills.
Use the APN, parcel map, road records, surveys, easements, planning jurisdiction, utilities, and site-specific professional review.
Watch for the regular secured bill, homeowners’ exemption application, and one or more supplemental tax bills sent directly to the owner.
Check Proposition 19, disabled-veterans exemptions, homeowners’ exemption, and qualifying base-year transfer rules.
Use Assessor records for tax administration and Recorder documents, title reports, and surveys for ownership and legal-right questions.
Contra Costa County Assessor Quick Facts
| Item | Current Detail | Best Next Step |
|---|---|---|
| Official office | Contra Costa County Assessor | Open official Assessor page |
| Assessor address | 2530 Arnold Drive, Suite 100, Martinez, CA 94553 | Call before visiting for a specialist or deadline-sensitive matter. |
| Assessor phone | (925) 313-7400 | Call the Assessor |
| Assessor hours | Monday–Friday, 8:00 AM–4:00 PM | Verify holiday closures before traveling. |
| Online parcel search | ParcelQuest Lite by APN or street address | Open county ParcelQuest access page |
| Parcel locator | CCMAP parcel and address search | Open CCMAP |
| Tax bills | Contra Costa County Treasurer-Tax Collector | Open official tax portal |
| Assessment appeals | Separate Assessment Appeals Board process | Review appeal rules |
How to Search Contra Costa County Property Records by APN or Address
ParcelQuest Lite is the county-linked property-information service for Assessor maps, assessed values, and available building or parcel characteristics. CCMAP is useful when you need a visual parcel locator, APN, aerial imagery, road information, or planning layers.
If you have a tax bill, deed, title report, or closing statement, use the APN. For a normal residential parcel, an address search can help you discover the APN.
The ParcelQuest access page explains that the service is off-site and that map lines may not accurately reflect legal descriptions.
Compare the street address, city, parcel shape, assessed value, building details, and map location before saving the APN.
Use the APN in the Tax Collector portal to review the annual secured bill, paid status, supplemental bills, or delinquent amounts.
Use the Recorder for ownership documents and the appropriate city or county planning department for zoning and development questions.
Search by APN or street address for parcel maps, assessed values, and available property details.
Search addresses and parcels, copy the APN, view aerial imagery, and review available county layers.
How to Find and Verify a Contra Costa County APN
Contra Costa County commonly displays its Assessor Parcel Number as nine digits in three groups, such as 155-280-015. The APN identifies the assessment parcel and is the most reliable search key for tax, map, survey, and county-record research.
Where to find the APN
What the APN does not prove
Local Search Tips for Contra Costa County Cities and Unincorporated Areas
Contra Costa County includes dense Bay shoreline cities, central-county suburbs, Tri-Valley communities, Delta neighborhoods, agricultural land, hillside parcels, and large unincorporated areas. A county parcel search identifies the APN, but zoning and permit authority depends on where the parcel is located.
For property inside Richmond, Walnut Creek, Concord, Antioch, Brentwood, San Ramon, or another incorporated city, verify zoning and permits with that city.
County zoning and General Plan layers in CCMAP are intended for unincorporated areas such as Alamo, Bay Point, Bethel Island, Crockett, or El Sobrante.
Discovery Bay, Bethel Island, Byron, Knightsen, and agricultural parcels may require flood, levee, road, easement, water, and wastewater research.
How to View and Pay Contra Costa County Property Taxes
The Assessor establishes assessed value. The Auditor-Controller calculates the tax by applying the tax rate and adding direct charges. The Treasurer-Tax Collector issues and collects secured, unsecured, supplemental, redemption, and delinquent taxes.
Search using the APN, property address, unsecured bill number, or another supported account identifier.
Verify the situs address, APN, annual bill, supplemental bill, installment, and paid or delinquent status.
E-check currently has no service fee. PayPal, credit-card, and debit-card payments currently carry a 2.50% fee with a $3.50 minimum.
Keep the bill PDF, confirmation number, payment date, payment method, and bank or card record.
| Payment Method | Current Listed Service Fee | Important Note |
|---|---|---|
| E-check | No service fee | A rejected e-check may be subject to a county returned-check fee of up to $85. |
| Credit Card | 2.50%, $3.50 minimum | Verify the final processor fee before authorizing payment. |
| Debit Card | 2.50%, $3.50 minimum | Do not assume a debit card has a flat fee. |
| PayPal | 2.50%, $3.50 minimum | Review the payment account and fee before submission. |
Regular secured property-tax dates
| Installment | Due | Delinquent After |
|---|---|---|
| First installment | November 1 | December 10 |
| Second installment | February 1 | April 10 |
Open the official Contra Costa County tax lookup and payment portal or review official secured-property-tax information.
What New Contra Costa County Property Owners Should Know About Supplemental Bills
A qualifying ownership change or completed new construction can trigger reassessment and a supplemental tax bill. The supplemental bill taxes the increase in assessed value from the event date through the end of the applicable fiscal year. It is separate from the regular secured tax bill and does not replace it.
Why more than one supplemental bill may arrive
An ownership change or completed construction event occurring between January 1 and May 31 can affect two fiscal periods. This can produce more than one supplemental bill for the same event.
Review official supplemental-property-tax guidance and read the county’s new-property-owner information.
Why a Contra Costa County Tax Bill May Include More Than the Basic Property Tax
The Assessor controls assessed value but does not create every charge appearing on the tax bill. A bill may include voter-approved debt, school bonds, Mello-Roos or Community Facilities District charges, sewer or water charges, lighting or landscaping assessments, and other direct charges from local agencies.
| If the Question Is About… | Best Office or Agency | What to Check |
|---|---|---|
| Assessed property value | County Assessor | Base-year value, land value, improvement value, exemption, and reassessment event. |
| Tax-rate calculation | Auditor-Controller | Applied tax rate and mathematical calculation. |
| Mello-Roos, CFD, sewer, school, or district charge | Agency listed beside the direct charge | District name, phone number, charge basis, payoff, and protest or correction process. |
| Payment, penalty, receipt, or delinquency | Treasurer-Tax Collector | Payment date, amount, installment, penalty, and transaction confirmation. |
How to Use CCMAP for Parcels, Zoning, Aerial Imagery, and Roads
CCMAP is Contra Costa County’s parcel locator. It can help users search an address or parcel, identify the APN, view aerial imagery, and display available layers such as General Plan, zoning, creeks, school locations, fire stations, and county-maintained roads.
Search the address, select the property, and copy the nine-digit APN from the parcel information panel.
County General Plan and zoning information is intended for unincorporated Contra Costa County parcels.
Public Works instructs users to enable the Public Works and Maintained Roads layer. A green-highlighted road indicates county maintenance.
How to Find Assessor Maps, Surveys, Subdivision Maps, and Road Records
Contra Costa County Public Works provides Laserfiche access to recorded subdivision maps, minor-subdivision maps, records of survey, corner records, annotated Assessor parcel books, and archived parcel-book pages.
The APN identifies the parcel book and page needed for the annotated Assessor parcel-book search.
Review map references associated with the parcel. Survey references may appear using record-of-survey or corner-record book and page identifiers.
Use the recorded-map search to retrieve the subdivision, parcel map, record of survey, or corner record.
A recorded subdivision map may show some easements, but Public Works warns that not every easement will necessarily appear on that map.
Review official Maps and Records guidance or open the Public Works Laserfiche record system.
How to Search Contra Costa County Deeds, Liens, and Recorded Documents
Use the County Clerk-Recorder when you need the latest recorded deed, deed of trust, lien, release, reconveyance, easement document, transfer record, or certified copy. The Assessor’s online property page is not an ownership-history or title-search system.
Use the APN, deed, title report, closing statement, or available property documents to identify likely grantor and grantee names.
Search available indexes by party name, document number, recording date, or APN when supported.
An index entry does not show every legal term, easement, condition, vesting detail, or restriction contained in the document.
The latest deed alone may not reveal every lien, encumbrance, easement, court matter, or ownership issue affecting the property.
Open the official Contra Costa County Recorder property-document page.
Assessor Forms for Exemptions, Address Changes, and Ownership Events
Contra Costa County provides forms for homeowners’ exemption, address changes, Proposition 8 value reviews, business property, boats and aircraft, ownership changes, deaths of property owners, and qualifying reassessment exclusions.
| Task | Likely Form or Process | What to Prepare |
|---|---|---|
| Claim homeowners’ exemption | Claim for Homeowners’ Property Tax Exemption | APN, owner information, principal-residence address, occupancy date, and requested identification details. |
| Change the mailing address | Change of Address Form | APN, prior address, new address, owner signature, and contact information. |
| Request a value review | Residential/Multi-Family or Commercial/Apartments Proposition 8 form | January 1 opinion of value, comparable sales, property-condition evidence, and current assessment information. |
| Report a transfer | Preliminary Change of Ownership Report | APN, deed, transfer terms, buyer and seller information, and applicable exclusion claims. |
| Report death of an owner | Change in Ownership Statement—Death of Real Property Owner | APN, date of death, deed, trust or estate documents, and legal description if needed. |
| Transfer a qualifying base-year value | Current Proposition 19 form | Original and replacement residence information, values, dates, age, disability, or disaster evidence. |
Open official Contra Costa County Assessor forms and review the county’s Proposition 19 guidance.
Homeowners’ Exemption and Other Property Tax Savings
An eligible owner who occupies the property as a principal residence may claim a $7,000 reduction in assessed value. Contra Costa County explains that this generally reduces the annual property tax bill by at least $70.
A new property owner should complete and return the exemption application even if the prior owner had an exemption.
Current eligibility can involve owners age 55 or older, severely disabled owners, disaster victims, and qualifying parent-child or grandparent-grandchild transfers.
Eligibility and exemption amount depend on service-connected disability, income where applicable, ownership, residency, and current state rules.
How to Request a Value Review or File an Assessment Appeal
Start with the Assessor’s free informal value-review process when you believe the January 1 market value is below the assessed value. Use the residential or commercial form that matches the property type and provide market evidence.
Save the APN, land value, improvement value, total assessed value, exemption, and property characteristics.
Use comparable sales, an appraisal, photographs, condition evidence, repair estimates, leases, or income data appropriate to the property.
Submit the current Assessor form and keep a complete copy, delivery record, and any response.
A pending informal review does not replace or extend the formal Assessment Appeals Board filing period.
| Appeal Type | Current Filing Rule | Important Detail |
|---|---|---|
| Regular assessment appeal | July 2 through November 30 | Verify the current calendar-year instructions before filing. |
| Supplemental or escape assessment | Within 60 days of the Assessor notice | Use the notice mailing date and instructions. |
| Application fee | $40 | Verify the fee, payee, and accepted payment method on the current application. |
Open the free informal value-review page or review formal Assessment Appeals Board instructions.
Assessor Public-Counter Records and Listed Service Fees
Some information or printed material is available from the Assessor’s public service counter when the online system does not provide what you need. Verify the current fee before ordering or traveling.
| Service | Current Listed Fee | Planning Note |
|---|---|---|
| Assessor map page | $3 each | An additional mailing charge may apply. |
| Mailing an Assessor map page | $2.50 additional | Confirm the total before requesting delivery. |
| Radius search | $50 | Ask what data and distance the search covers. |
| Property information printout | $1 per page | Specify the parcel and information needed. |
| Property characteristics | $7.50 per parcel | Verify whether online details already answer the question. |
Decision Table: Which Contra Costa County Office Should You Use?
| If You Need | Use This Office or Tool | Official Action |
|---|---|---|
| APN, assessed value, map, exemption, or property characteristics | Assessor / ParcelQuest Lite | Open Maps and Property Information |
| Visual parcel locator, aerial imagery, county zoning, or maintained-road layer | CCMAP | Open CCMAP |
| Tax amount, payment, receipt, history, or delinquency | Treasurer-Tax Collector | Open tax portal |
| Deed, lien, release, or recorded ownership document | County Clerk-Recorder | Open Recorder property search |
| Subdivision map, record of survey, corner record, or Assessor parcel book | Public Works Records / Laserfiche | Open Maps and Records guidance |
| Zoning or permit information inside a city | The incorporated city’s planning or building department | Confirm that the parcel is within the city before relying on county zoning. |
| Unincorporated zoning or land-use research | Contra Costa County planning and CCMAP | Open property and zoning research |
| Informal value review or formal appeal | Assessor first, then Assessment Appeals Board | Review appeal rules |
Contra Costa County Property Office Contacts
Address: 2530 Arnold Drive, Suite 100, Martinez, CA 94553
Phone: (925) 313-7400
Fax: (925) 313-7488
Hours: Monday–Friday, 8:00 AM–4:00 PM
Address: 625 Court Street, Room 100, Martinez, CA 94553
Phone: (925) 608-9500
Walk-in hours: Monday–Friday, 8:00 AM–5:00 PM
Call center: Monday–Friday, 8:00 AM–4:00 PM
Address: 1025 Escobar Street, 1st Floor, Martinez, CA 94553
Phone: (925) 655-2008
Hours: Monday–Friday, 8:00 AM–5:00 PM
Have the APN, assessment notice, filing date, and evidence ready.
Documents to Gather Before You Search, Call, File, or Pay
Common Contra Costa County Property-Search Mistakes
The county does not display owner names in its online Assessor property-information service. Use recorded documents for ownership research.
Condos, corner parcels, subdivisions, and multiple structures can share similar addresses. Verify the APN and parcel shape.
Incorporated cities maintain their own zoning and permit systems. County zoning layers are intended for unincorporated land.
The assessed-value calculation does not explain every CFD, school, sewer, lighting, landscape, or district charge.
Supplemental bills are sent directly to the homeowner and may not be handled automatically by the lender.
Use recorded maps, title evidence, legal descriptions, and a licensed surveyor when boundaries or easements matter.
Contra Costa County Property Search Troubleshooting
| Problem | Likely Reason | Best Next Step |
|---|---|---|
| Address search returns no parcel | Vacant land, private road, unit formatting, new subdivision, or address mismatch | Use CCMAP, a tax bill, deed, or title report to obtain the APN. |
| ParcelQuest shows the wrong property | Similar street names, wrong city, duplicate address, or adjoining parcel | Compare parcel shape, city, ZIP code, APN, and tax bill. |
| Tax portal shows several bills | Regular, supplemental, unsecured, corrected, or delinquent assessments | Open each bill and verify the bill type, event date, and responsible taxpayer. |
| Deed owner differs from Assessor information | Recorder and Assessor updates may occur on different schedules | Save the recorded document number and contact the Assessor about processing status. |
| CCMAP zoning differs from city records | The parcel is inside an incorporated city | Use the city’s current zoning map and contact its planning department. |
| Tax payment does not appear immediately | Posting delay, pending bank processing, or rejected transaction | Save the confirmation and contact the Tax Collector before paying again. |
What to Save After a Property Search, Payment, or Filing
Safety Warning for Property Reports, Tax Payments, and Appeal Offers
Sponsored search results, private owner databases, tax-reduction solicitations, paid parcel reports, and listing websites may reuse public information. They do not replace official Assessor records, Tax Collector bills, recorded documents, surveys, or city and county planning decisions.
Contra Costa County Property Search: Direct Answers
| How can I search Assessor property information? | Use ParcelQuest Lite and search by nine-digit APN or street address. |
| Can I search by owner name? | Owner names are not displayed through the county’s online Assessor property-information page. Use the latest recorded deed or Recorder index. |
| Where do I find the APN? | Check the tax bill, CCMAP, ParcelQuest, deed, title report, or closing statement. |
| Where do I pay property taxes? | Use the Contra Costa County Treasurer-Tax Collector’s official tax portal. |
| Where do I find deeds and liens? | Use the Contra Costa County Clerk-Recorder’s property-document search. |
| Where do I find surveys and subdivision maps? | Use Public Works Maps and Records and the Laserfiche recorded-map system. |
| Who handles zoning? | The county handles zoning for unincorporated parcels; incorporated cities handle their own zoning and permits. |
| What should I do if the value is too high? | Request a free informal value review, gather January 1 market evidence, and protect the formal appeal deadline. |
Official Source Notes
Frequently Asked Questions
How do I search Contra Costa County property records?
Use the county-linked ParcelQuest Lite service and search by the nine-digit Assessor Parcel Number or street address. Use CCMAP when you need a visual parcel locator, aerial imagery, or county map layers.
Can I search Contra Costa County Assessor records by owner name?
No owner names are displayed through the county’s online Assessor property-information page. Use the latest recorded deed or the Clerk-Recorder’s property-document search for ownership research.
Where can I find a Contra Costa County APN?
Look on the annual tax bill, ParcelQuest result, CCMAP parcel panel, recorded deed, preliminary title report, closing statement, or Assessor notice.
How many digits are in a Contra Costa County APN?
A Contra Costa County APN generally contains nine digits and is commonly displayed in three groups, such as 155-280-015.
Who handles Contra Costa County property-tax payments?
The Contra Costa County Treasurer-Tax Collector handles property-tax lookup, payments, receipts, paid history, delinquency, supplemental taxes, unsecured taxes, and redemption taxes.
What online tax-payment fees are currently listed?
E-check currently has no service fee. PayPal, credit-card, and debit-card payments currently carry a 2.50% service fee with a $3.50 minimum. A rejected e-check may be subject to a returned-check fee of up to $85.
Does my mortgage company automatically receive a supplemental tax bill?
No. Contra Costa County states that a supplemental tax bill is sent directly to the homeowner and not automatically to the mortgage company.
Can I receive more than one supplemental tax bill?
Yes. An ownership change or completed construction event between January 1 and May 31 can affect two fiscal periods and may produce more than one supplemental bill.
Is CCMAP a legal property survey?
No. CCMAP and ParcelQuest are useful research tools but do not replace a legal description, recorded map, title report, or licensed boundary survey.
Does Contra Costa County zoning apply inside every city?
No. County zoning and General Plan layers are intended for unincorporated Contra Costa County. Incorporated cities maintain their own zoning and permit systems.
How do I find a deed or lien in Contra Costa County?
Use the Contra Costa County Clerk-Recorder’s property-document search. Review the actual recorded document and use a title professional when a complete title search is needed.
How do I find surveys or recorded parcel maps?
Find the APN in CCMAP, use the Public Works annotated Assessor parcel books to locate map references, and open the associated survey, subdivision map, or corner record in Laserfiche.
How much is the Contra Costa County homeowners’ exemption?
An eligible principal residence may receive a $7,000 reduction in assessed value, generally reducing the annual tax bill by at least $70.
When can I file a regular Contra Costa County assessment appeal?
Regular assessment appeals must be filed from July 2 through November 30. Supplemental and escape assessments generally must be appealed within 60 days of the Assessor notice.
Does an assessment appeal postpone the tax-payment deadline?
No. Property taxes must generally be paid by the delinquent date even while an informal review or formal appeal is pending.
Are the calculators on this page official Contra Costa County tools?
No. They are educational planning helpers only and do not create an official assessment, tax bill, exemption approval, appeal decision, legal survey, title opinion, or government record.
What to Do Next
Start by finding the correct nine-digit APN in ParcelQuest or CCMAP. Use that APN to verify the tax account, identify recorded maps and documents, determine the correct city or county planning jurisdiction, and prepare exemption or appeal forms. Save every result and confirm the official record before paying taxes, buying property, relying on a boundary, filing an appeal, or recording an ownership transfer.