King County Property Search 2026: Free Lookup by Address
Looking up a home, condo, commercial building or vacant parcel in King County? Start with the county’s official eReal Property system or GIS Parcel Viewer. Both can help you locate a parcel using its street address.
From there, you can review assessed values, property characteristics, parcel identifiers and sales information. Separate county services provide tax bills, payment history, recorded deeds and detailed property maps.
Quick Answer: How to Search King County Property Records
For a free King County property search by address, open the official Parcel Viewer, enter the property address and select the matching parcel. Click the property report to access the Assessor’s detailed information.
If you already have the parcel number, you can use the Assessor’s property information tools without starting on the map.
Important: The Assessor, Treasury and Recorder manage different records. One search may not provide every document you need.
How to Search King County Property Records by Address
The following method works well when you know the property’s street address but not its parcel number. The GIS map connects the address to the county’s assessment records.
Open King County Parcel Viewer
Visit the county’s official interactive parcel map. It supports address, parcel number and condominium-name searches.
Enter the Property Address
Type the street number and street name into the address search field. Select the appropriate match. Use the correct city when streets have similar names across King County.
Identify the Parcel
The map displays the selected property and related parcel information. Check the location, address and parcel number to make sure you have the correct land record.
Open the Property Report
Use the Property Report link from the parcel details to review Assessor information, including available property characteristics, assessments and valuation history.
Use the Parcel Number for More Records
Keep the parcel number. Use it to access property tax information and, where supported, recorded documents from the King County Recorder’s Office.
Check the Record Date and Source
Make sure the value year, sale date or tax year matches the information you need. For legal ownership or a transaction, review recorded instruments rather than relying on the property summary alone.
Official King County Property Search Tools
Choose the service that matches the record you need. These are county-operated resources, not third-party record aggregators.
What Information Can a King County Property Search Show?
Different databases serve different purposes. A property assessment record is not the same thing as a recorded deed, title report or property tax receipt.
| Record type | What you may find | Best source |
|---|---|---|
| Parcel identification | Parcel number, situs address and property location. | Assessor / Parcel Viewer |
| Assessed value | Land value, improvement value and assessment-year data. | Assessor |
| Property characteristics | Available building details, land area, use and other assessment characteristics. | eReal Property |
| Sales information | Recorded or assessment-related sale history, subject to available coverage. | Assessor / eSales |
| Property taxes | Charges, payments, balances and tax-year history. | Treasury Operations |
| Deeds and mortgages | Recorded instruments and indexed parties. | Recorder’s Office |
| Parcel mapping | Approximate parcel outlines, location and selected geographic layers. | GIS Parcel Viewer / iMap |
How to Find a Property Owner in King County
Property ownership research is most useful when it begins with the parcel rather than a name alone. A parcel search can help identify the assessment account and connect you to recorded instruments.
Search by Property Address
Use Parcel Viewer or the Assessor’s property search. Review the owner or taxpayer information made publicly available with the parcel record, if shown.
Remember that the taxpayer listed on an assessment record is not necessarily the full legal ownership picture.
Verify Using Recorded Documents
Use the parcel identifier or known party names to search the Recorder’s Office index. A recorded deed can provide important information about a property transfer.
If legal ownership, encumbrances or marketable title matters, a professional title examination may be necessary.
What if the Property Is Owned by an LLC or Trust?
The assessment record or deed may identify an entity rather than an individual. Do not assume that a mailing address or registered agent identifies the beneficial owner. Entity information and title ownership are separate questions.
Can You Find an Owner’s Phone Number?
King County’s property records are not a general personal-contact directory. Public records may include certain mailing or ownership information, but should not be treated as a source of private telephone numbers or personal email addresses.
King County Property Tax Search: Bills, Balances and Payments
King County Treasury Operations administers property tax billing and collection. Its online service lets users research tax accounts and review payment information.
Find Your Account
Locate the parcel number using the Assessor, then use the Treasury search with that number. The county instructs users to omit dashes from the tax-account search.
Review Tax Years
Check annual charges, payment history and current balances. A paid amount from an earlier year does not establish that the current tax year has been paid.
Pay Through the County
Use the official Treasury payment portal for available payment methods. Payment processor charges depend on the method selected.
King County 2026 Property Tax Deadlines
Washington property taxes in King County are ordinarily due in two installments. The county’s published deadlines are:
| Installment | 2026 deadline | What to check |
|---|---|---|
| First half | April 30, 2026 | Payment or postmark requirement and any unpaid balance. |
| Second half | November 2, 2026 | October 31 falls on a Saturday; county guidance moves weekend deadlines to the next business day. |
For tax deadlines or delinquent accounts, rely on the current county payment page. Late payments may result in statutory interest and other applicable charges.
2026 Online Payment Service Fees
King County lists the following payment processing fees for its property tax service:
| Payment method | Published service fee |
|---|---|
| Electronic check (eCheck) | $0.55 flat fee |
| Domestic credit/debit card or PayPal | 2.35%, minimum $2.00 |
| International credit card | 3.95%, minimum $2.00 |
Fees can change. Confirm the final amount on the official payment screen before submitting a transaction.
King County Parcel Maps, Lot Lines and GIS
Parcel Viewer is designed for quick property identification. King County iMap is useful when you need a wider selection of map layers and geographic context.
Parcel Viewer
Use this tool to search by address, condo name or parcel number. Select a parcel to open its summary and related assessment report.
iMap
Use iMap for customized map displays, geographic layers, aerial imagery and additional mapping questions.
Are Parcel Boundaries Legally Exact?
No. King County Parcel Viewer explicitly warns that lot lines are approximate and not for legal use. The GIS outline is helpful for locating property, but it does not replace a boundary survey or recorded legal description.
Does a King County Parcel Map Show Zoning?
GIS tools can display certain zoning-related layers. However, zoning authority depends on whether the parcel lies inside an incorporated city or unincorporated King County.
A parcel in Seattle, Bellevue, Redmond, Kent or Renton may require zoning confirmation from that city’s planning department. Unincorporated parcels are subject to the applicable King County land-use authority.
How to Search King County Deeds and Recorded Property Documents
The King County Recorder’s Office maintains an online official-records search. Its Landmark system provides access to indexed land documents, including deeds, mortgages, liens, plats and certain surveys.
Search a Deed Using a Parcel Number
- Use the Assessor or Parcel Viewer to find the property’s parcel number.
- Open the Recorder’s Office search page.
- Follow the official Start Search link to Landmark.
- Select the parcel search and enter the first ten digits of the parcel identifier in the appropriate field.
- Review matching instruments, parties, recording dates and available document images.
The county notes that parcel-based document searches cover records from 1997 onward. Other search approaches, including party name and recording number, may help with records that are not returned using a parcel number.
Can You Search Recorded Deeds Directly by Address?
Not in the Recorder’s standard index. The county explains that its recorded-documents search does not maintain an address search field. Convert the property address to a parcel number first, then use the appropriate search method.
Free Viewing vs. Certified Document Copies
The county provides free online searching and unofficial document images where available. If you need an official certified copy for a legal, lending or administrative purpose, a fee applies.
| Copy request | Published fee |
|---|---|
| Certified recorded document, legal size or smaller | $3 first page; $1 each additional page |
| Uncertified recorded document, legal size or smaller | $1 per page |
These are the county’s listed standard copy charges, not a guarantee of the final cost for every document or ordering method. Verify current fees through the official copy-request instructions.
What About Older Records?
The county states that most recorded documents dating from August 1991 can be accessed through the online system. Earlier records may require assistance from King County Archives. Digital search coverage and parcel-index coverage are not identical.
Understanding King County Assessed Property Values
An assessed value is the value determined under the county’s property assessment process. It should not automatically be interpreted as today’s listing price, a lender’s appraisal or a guaranteed sale price.
Land Value
The assessed value attributed to the land portion of a parcel.
Improvement Value
The assessed value attributed to buildings or other qualifying improvements.
Total Assessed Value
The combined assessment value shown for the relevant year, subject to the county’s classification and reporting.
Why Can Tax Bills Change When Assessed Value Changes?
Property tax bills depend on more than one property’s valuation. Taxing district levies, voter-approved measures, applicable exemptions and other charges can affect the amount due.
Two homes with similar assessment values may have different tax bills because they are in different taxing districts or have different applicable adjustments.
2026 Taxes vs. 2026 Assessment Values
These are not the same reporting period. Washington’s assessment process generally uses assessed values to determine taxes payable in the following year.
When comparing values and taxes, check both the assessment year and the tax year displayed in the county records.
What to Do if Your King County Property Assessment Seems Wrong
Start by reviewing the physical characteristics and valuation history in your eReal Property report. Incorrect square footage, building characteristics or other assessment details may affect the recorded valuation.
Step 1: Contact the Assessor About Factual Errors
If you find inaccurate property characteristics, contact the King County Assessor at 206-296-7300. The county recommends asking about possible corrections before submitting a formal appeal.
Step 2: Gather Supporting Evidence
Relevant evidence may include comparable property sales, photographs, independent appraisals, contractor estimates or documents showing restrictions on use or development.
Step 3: File With the Board of Equalization
Formal property valuation appeals are handled by the King County Board of Equalization. According to the county, the filing deadline is the later of July 1 of the assessment year or 60 days from the mailing date on the valuation notice, subject to applicable rules.
Read official King County assessment appeal instructions →
Property Tax Exemptions and Relief
King County offers information about property tax relief programs, including programs for qualifying seniors and people with disabilities. Eligibility and application requirements depend on the specific program.
Visit the Assessor’s official website to review available relief options and current application instructions.
King County Property Search Not Working? Common Problems
| Problem | Possible reason | What to do |
|---|---|---|
| No address match | Address formatting, unit information or search-index differences. | Try the street number and name without the unit, or locate the parcel on the map. |
| Multiple parcel matches | Condos, multi-parcel property or similar addresses. | Check the location, condo details and parcel identifier before proceeding. |
| Old owner information | Assessment data may not yet reflect a recorded transfer. | Check the Recorder’s Office and confirm the recording date. |
| Tax search fails | Incorrect account number or formatting. | Confirm the parcel number and remove dashes as instructed by Treasury. |
| No deed result | Different indexing, older record or parcel-based search limitation. | Try name, recording number or legal description where supported. |
| Incorrect building details | An outdated or incorrect assessment characteristic. | Contact the Assessor and provide documentation supporting the correction. |
| Map boundary disagreement | GIS boundaries are approximate. | Use recorded survey materials or a qualified surveyor for legal boundary questions. |
If a county tool is temporarily unavailable, begin from the responsible department’s official landing page rather than using an unfamiliar third-party payment or records service.
King County Property Records Offices and Contacts
Use the office that manages your particular request. These agencies have different roles in maintaining property information.
King County Assessor
Handles: Assessed values, property characteristics and valuation questions.
Phone: 206-296-7300
Email: assessor.info@kingcounty.gov
King County Treasury Operations
Handles: Property tax billing, payments, tax balances and related customer service.
Address: King Street Center, 201 S. Jackson St., Suite 710, Seattle, WA 98104.
Phone: 206-263-2890
Hours: Monday–Friday, 8:30 a.m.–4:30 p.m., subject to county closures.
King County Recorder’s Office
Handles: Recorded deeds, mortgages, liens, plats and recorded document copies.
Address: 201 S. Jackson St., Suite 204, Seattle, WA 98104.
Phone: 206-477-6620
In-person hours: Weekdays, 8:30 a.m.–4:30 p.m.; recording closes at 3:30 p.m.
Frequently Asked Questions
Is King County property search free?
Yes. King County provides free online access to its official property assessment search, GIS Parcel Viewer and recorded-document search. Fees may apply for certified copies, document orders and tax payment processing.
Can I search King County property records by address?
Yes. The county’s GIS Parcel Viewer and Assessor property research tools support address-based lookup. For recorded deeds, first identify the parcel number because the Recorder’s document index does not provide a standard address search field.
How do I find my King County parcel number?
Enter the property address in Parcel Viewer, select the correct parcel and review its parcel number. You may also find the number on a county tax statement or property value notice.
Can I find property ownership information online?
Assessment information may show publicly available taxpayer or owner details. For property transfers, search recorded deeds through the Recorder’s Office. A current title report may be needed to establish legal ownership and related interests.
Can I check if King County property taxes have been paid?
Yes. Use the Treasury’s official property tax lookup and open the appropriate tax account. Review the balance, payments and applicable tax year.
When are King County property taxes due in 2026?
The first-half deadline is April 30, 2026. The ordinary second-half deadline is October 31, but because that date falls on a Saturday in 2026, the county’s next-business-day rule places the deadline on November 2, 2026. Confirm the final deadline and any account-specific circumstances with Treasury.
Are King County parcel maps accurate for boundary disputes?
No. The county’s GIS parcel outlines are approximate and are not intended for legal boundary determinations. Use recorded survey information and professional surveying services when a legally reliable boundary is needed.
How do I find an older recorded deed?
Start with the Recorder’s online records search. If the document predates available online coverage or cannot be located, contact the Recorder’s Office or King County Archives about historical records.
Can I appeal my property’s assessed value?
Yes. King County property owners can challenge an assessment through the Board of Equalization. The filing period depends on the assessment year and the date of the valuation notice. Review the official instructions before filing.
Does a property search show the current market price?
Not necessarily. Assessed values, recorded sale prices and present-day market estimates serve different purposes. The county’s assessment information should not be treated as a guaranteed sale or listing price.
Official Source References
The following public agencies and tools provide the records used throughout this guide:
- King County Assessor — valuations, characteristics, tax relief and assessment information.
- King County GIS Property Research — assessment and geographic search tools.
- King County Parcel Viewer — address and parcel lookup.
- King County Treasury — tax accounts and payments.
- King County Recorder’s Office — recorded land documents.
- King County Assessment Appeals — formal appeal information.
Information reviewed for the 2026 guide. County websites and services may change; verify time-sensitive account information directly with the responsible office.