King By County Property Assessor 2026: Search & Tax Records

King County WA Address, Parcel & 2026 Tax Guide

Find King County Property by Address, Parcel Number, Value & Tax Record

The easiest way to complete a King County assessor property search by address is to start with the official Parcel Viewer or eReal Property system. Enter the street address, identify the correct parcel, copy its King County parcel number, and then use that parcel to open assessed values, property characteristics, levy information, sale history, tax bills, recorded deeds and development-condition reports.

This matters because several King County systems are parcel-based rather than address-based. The Recorder’s official land-record system, for example, does not maintain an address search field. Starting with the address in Parcel Viewer creates the parcel-number “key” that lets you move reliably through the Assessor, Treasury and Recorder systems.

Address → parcel number → Assessor report

Valuation, characteristics, levy & sales history

2026 tax bill, late charges & October deadline

Appeals, senior relief, deeds & GIS research

Search Property by Address Open eReal Property View / Pay Property Tax Search Deeds & Records

ADDRESS → 10-DIGIT PARCEL → VALUE → TAX / DEED

KING COUNTY PROPERTY

Parcel VERIFY

Assessed Value CHECK

Levy Rate OPEN

Sale History REVIEW

Tax / Deed CONNECT

PARCEL VERIFIED FROM STREET ADDRESS

County Assessor John Wilson

Assessor phone 206-296-7300

Parcel format Usually 10 digits

Tax hotline 206-263-2890

Last reviewed August 12, 2026

Current August 2026 position

First-Half Taxes Are Past Due — Second Half Is Due October 31

2026 tax bill: the first-half deadline was April 30. If unpaid, monthly late charges began May 1. The second-half deadline is October 31, 2026.

2026 assessment appeals: July 1 has passed, but a taxpayer can still be timely when the parcel’s valuation notice creates a later 60-day appeal deadline.

Do not automatically assume your 2026 assessment appeal is closed. King County mails valuation change notices between May and November. A petition is due by the later of July 1 of the assessment year or 60 calendar days after the valuation notice mailing date.

Limited-income deferral still has a current deadline: qualifying owners can apply by September 1. The county’s current program uses a $57,000 prior-year household-income limit plus ownership, occupancy and equity requirements.

Exact keyword intent: property search by address

How to Search King County Property by Street Address

Open King County Parcel Viewer. Go directly to King County Parcel Viewer.

Select Address in the search control. The map supports address and parcel-number searching as well as selecting a parcel directly from the map.

Enter the property street address. Select the correct match rather than relying only on a visually similar property.

Read the parcel summary. The selected parcel appears on the map and the summary panel provides the parcel number and property links.

Copy the King County parcel number. Real-property parcel numbers are commonly 10 digits; one county example is formatted 806100-0045.

Click Property Report. Parcel Viewer links directly into the Assessor’s eReal Property information for the selected parcel.

Open the Districts Report if needed. This adds planning, electoral and administrative district information and can connect to map, survey and development resources.

Use the parcel number for taxes and recorded documents. Once the address has been converted to a parcel ID, later searches become much more precise.

Why Parcel Viewer is ideal for an address-first search: King County’s Recorder does not index its official land-record database by street address. Parcel Viewer converts your address into the parcel number that the Recorder can use.

Assessor property information

What eReal Property Shows After You Find the Address

King County’s eReal Property system is the Assessor’s searchable Property Information System. County property-research guidance says it can be searched by address, parcel number or condominium/apartment complex name.

Property Report Parcel identity, current owner, legal description and tax-roll information.

Property Detail Land, building and other parcel characteristics used in assessment research.

Sales History Recent sale and conveyance information for the subject property.

Assessed Values Current and historical valuation data relevant to tax calculations and appeals.

Levy Information Taxing-district and levy-rate data affecting the parcel’s property tax.

Related Records Links can connect the parcel to tax bills, district reports and relevant recorded documents.

King County Property Record Decoder

Property field	What it tells you	What to verify next
Parcel Number	Tax identifier used to connect Assessor, Treasury, GIS and land-record research.	Copy all digits before changing systems.
Current Owner	Ownership shown in Assessor property information.	Use the recorded deed when legal title matters.
Legal Description	Tax-parcel legal-description information.	Use the full deed, plat or survey for legal reliance.
Assessed Value	County opinion of taxable market value for the applicable assessment date.	Confirm the assessment year before comparing a tax bill.
Land Data	Parcel land characteristics relevant to valuation.	Check acreage, lot characteristics and development limitations.
Building Data	Structure characteristics used by residential or commercial appraisal.	Look for incorrect size, condition or improvement information.
Sale History	Property transaction history useful for appraisal and ownership research.	Open corresponding recorded document where available.
Levy Rate	Combined rate applying to the property’s specific taxing districts.	Do not substitute a Seattle or countywide rate for another levy code.
Permit History	Recent permitting information can appear in property-detail research.	Use the applicable city or King County permitting agency for full permit files.

Parcel Viewer + Districts Report + iMap

Use GIS to Understand More Than the Assessed Value

Parcel Viewer Find the parcel by address, parcel number or map click and open Assessor and district reports. Districts & Development Conditions Research planning, administrative and electoral districts plus development-related designations. King County iMap Add aerial imagery, contours, unincorporated-area zoning, planning areas and district boundaries.

Parcel-map boundaries are not a substitute for a legal survey. Use recorded plats, surveys and deeds when an exact boundary, easement or encroachment matters.

Annual market-value assessment

How King County Residential Property Is Assessed

King County assesses residential property each year at market value—what a willing buyer would pay a willing seller. For taxes paid in a given year, most property is valued as of January 1 of the preceding year.

Sales Comparison Appraisers compare the subject to relevant market sales and account for property differences.

Cost Approach Appraisers can estimate the replacement cost of improvements as another valuation method.

Annual Assessment Property is reassessed annually, while the county also identifies specific physical-inspection areas for field review.

2026 tax-year distinction: most taxes being paid in 2026 are based on a January 1, 2025 valuation. A valuation notice issued during the 2026 assessment year generally affects taxes payable in 2027.

Useful for buyers and assessment appeals

Use King County eSales to Find Comparable Properties

The Assessor’s eSales tool can search residential, residential condominium and commercial sales. For residential searches, filters include area, document dates, sale price, present use, waterfront status, view, lot size, building grade, building condition, living area and year built.

Find the subject parcel first. Use your street address in Parcel Viewer and copy the parcel number.

Open eSales. Use King County Residential eSales.

Enter the subject parcel when helpful. eSales can prefill or limit search fields using the subject property’s characteristics.

Choose the correct sale period. Appeals should focus on market evidence relevant to the valuation date rather than unrelated current listings.

Compare superior and inferior features. Building condition, size, lot, view, waterfront and location can materially change comparable value.

July 1 OR 60 days from valuation notice

King County 2026 Property Assessment Appeal Deadline

Valuation date Assessment reflects market value as of the statutory date.

Value notices King County mails valuation change notices during the assessment year.

General date Standard Board of Equalization filing date.

Notice rule A later deadline can apply based on the notice mailing date.

Hearing Complete petitions proceed through Board review and hearing.

As of August 12, July 1 itself has passed—but your appeal may still be timely. The controlling deadline is the later of July 1 or 60 calendar days after the valuation notice mailing date.

Look up your parcel’s actual appeal due date. King County says eAppeals can show the filing date after you enter the property address or parcel number.

Review eReal property characteristics first. If the Assessor agrees that a factual error exists and corrects the value, a formal appeal may not be necessary.

Prepare your opinion of market value. An appeal must explain why the Assessor’s value exceeds true and fair market value.

File online or by mail. King County accepts real-property appeals through eAppeals or mailed petitions; petitions are not accepted by email.

Include the valuation notice. A complete petition includes the Assessor parcel number, property information, Assessor value, taxpayer value opinion, supporting reasons and a copy of the notice.

Evidence that directly addresses market value

Comparable sales near valuation date
Recent arm’s-length sale of subject property
Independent appraisal
Contractor repair estimates
Photos documenting physical problems
Easements limiting use
Development restrictions
Maps showing access or environmental limitations

Free independent help: King County’s Property Tax Advisor can help residential taxpayers identify comparable sales, understand appeals and research property records. Phone: 206-477-1060.

Open Official King County Appeal Instructions Check the parcel-specific deadline, required evidence and online/mail filing routes.

2026 senior / disability relief

Senior, Disabled & Disabled Veteran Property Tax Exemption

Principal residence The program is intended for qualifying owners who live in the home as their principal residence.

Age / disability test King County’s current portal includes owners at least age 61 by December 31 of the preceding year, qualifying persons with disabilities and qualifying disabled veterans.

$84,000 income limit For reductions on 2024, 2025 and 2026 property taxes, current King County guidance uses household income of $84,000 or less after qualifying deductions.

Apply online when possible: King County recommends its Senior Exemption Portal because paper applications take longer to process.

Check Eligibility & Apply Review the current qualifying rules, prepare documents and submit the application through the county portal.

September 1, 2026 deadline is upcoming

Limited-Income Property Tax Deferral

This program is different from the senior exemption. Under King County’s current limited-income deferral program, the Washington Department of Revenue can pay 50% of property taxes on behalf of a qualifying owner. The deferred amount plus interest becomes a lien against the property until repaid.

$57,000 income limit Current program guidance uses prior-year annual household income of $57,000 or less.

Own for 5+ years The applicant must meet the program’s property-ownership, occupancy and equity requirements.

September 1 Applications are due September 1 each year and the program does not automatically renew.

First half must already be paid. King County says the taxpayer must pay the first-half taxes before applying to defer the second installment.

Open Limited-Income Deferral Rules Review income, occupancy, equity and filing requirements before September 1.

Treasury Operations handles tax collection

How to Find & Pay King County Property Taxes from an Address

Convert the address to a parcel number. Search the property in Parcel Viewer or eReal Property.

Open King County Property Taxes. Use the official Treasury payment system.

Enter the real-property parcel / tax account number. Real-property accounts are generally 10 or 12 digits.

Verify the property before paying. Confirm parcel, taxpayer/property identity, tax year and balance.

Check whether first-half tax is delinquent. The April 30 deadline has passed and late charges began May 1 on unpaid first-half taxes.

Prepare for October 31. Second-half 2026 property tax must be paid or postmarked by October 31 or becomes delinquent November 1.

If the full year’s tax is less than $50: King County requires full payment by April 30 rather than two installments.

Mortgage escrow does not remove the owner’s responsibility. King County advises taxpayers to make sure the mortgage company actually pays the tax on time.

2026 Online Tax Payment Fee & Deadlines

April 30 First-half property-tax deadline. This date has passed for tax year 2026.

October 31 Second-half property-tax deadline and the next major payment date.

2.35% card fee Beginning January 1, 2026, debit and credit card tax payments carry a 2.35% processor service fee with a $2 minimum.

Delinquent taxes continue to accrue late charges. Use the live Treasury account rather than manually estimating a payoff amount.

Uses the county’s levy-rate formula

King County Property Tax Estimate Calculator

Enter the assessed value and the parcel’s actual levy rate per $1,000. King County publishes 2026 taxing-district codes and levy rates, but there is no single correct countywide rate because cities, schools and special districts differ.

Assessed value

Levy rate per $1,000

Estimated annual property tax

Use the parcel’s assessed value and actual levy rate.

Formula: Assessed Value ÷ 1,000 × Levy Rate = estimated property tax.

Open 2026 Levy Codes & Rates Match the parcel to its actual taxing-district code rather than borrowing a nearby city’s rate.

Address → Parcel Viewer → Landmark

How to Find a King County Deed When You Only Know the Address

The King County Recorder’s Landmark system does not maintain a street-address search field. If all you know is the address, obtain the parcel number first and then move into the recorded-document search.

Deeds Recorded instruments transferring or establishing property ownership.

Mortgages Recorded real-estate financing instruments and related documents.

Easements / Liens Restrictions, rights and claims affecting a parcel.

Plats / Surveys Recorded maps and survey documents useful for land research.

Search the address in Parcel Viewer. Select Address, enter the street address and copy the resulting parcel number.

Open the Recorder’s free online records search. Use King County Recorder Records Search.

Choose Parcel search. Enter the first 10 digits of the Parcel ID in the Parcel ID field next to “Starts With.”

Know the parcel-search date limitation. King County says parcel-ID searches in Landmark retrieve recorded documents from 1997 to current.

Try name search for broader historical research. Enter names as Last Name, First Name—for example, Doe, John.

Open the document line item. This displays indexed document details and, where available, the recorded document image.

Online document availability: most documents recorded on or after August 1, 1991 are available online. Earlier documents are generally accessed through King County Archives.

Use RANS to Monitor Future King County Recordings

The Recorder’s free Recording Activity Notification System sends an email when a land-record document matching a registered personal or business name is recorded.

Register a name Monitor your personal name or a business name associated with property ownership.

Receive email notice A new matching land-record filing triggers notification.

Verify immediately Use Landmark to inspect the actual recorded document when an alert is unfamiliar.

Open King County Recorder Choose Recording Activity Notification System (RANS) to register for the free service.

Buyer & Homeowner Address-Search Checklist

Situation	Search first	Then verify
Know only the street address	Parcel Viewer.	Parcel number + Property Report.
Buying a Seattle-area home	eReal value, sales history and characteristics.	Tax bill, deed, district conditions and permits.
Value seems too high	Property characteristics and eSales comparables.	Parcel-specific appeal deadline.
Need current tax amount	Parcel number from eReal/Viewer.	Live Treasury balance.
Need legal owner	Assessor owner / sale record.	Recorder deed in Landmark.
Need development restrictions	Districts & Development Conditions Report.	Applicable planning/permitting jurisdiction.
Senior homeowner	Senior Exemption eligibility portal.	$84,000 current program income threshold and residence requirements.
Low income, not senior	Limited-Income Deferral.	September 1 deadline and equity requirements.

King County Property Offices in Seattle

King County Assessor John Wilson
King Street Center Customer Service Center
201 South Jackson Street, 2nd Floor
Seattle, WA 98104

206-296-7300
Assessor.Info@KingCounty.gov
Mon–Fri, 8:30 a.m.–4:30 p.m.

Treasury Operations King Street Center
201 South Jackson Street, Suite 710
Seattle, WA 98104

Property tax: 206-263-2890
Mon–Fri, 8:30 a.m.–4:30 p.m.

Recorder’s Office 201 South Jackson Street, Suite 204
Seattle, WA 98104

206-477-6620
Walk-in: Mon–Fri, 8:30 a.m.–4:30 p.m.
Recording ends at 3:30 p.m.

One-building advantage: the Assessor customer service area, Treasury Operations and Recorder’s Office are all at King Street Center, 201 South Jackson Street, although they use different floors/suites.

King County Address Search Problems & Fixes

Problem	Best fix	Correct route
Address gives no parcel	Try Parcel Viewer and simplify the street entry.	Parcel Viewer
Need map and parcel together	Use Parcel Viewer instead of only eReal.	GIS
Need full property characteristics	Open Property Report / Property Detail Report.	eReal
Need comparable sales	Use eSales with the subject parcel and valuation-relevant dates.	Assessor eSales
July 1 appeal date passed	Check whether the valuation notice creates a later 60-day deadline.	eAppeals / BOE
First-half tax unpaid	Open live Treasury balance because monthly late charges are accruing.	Treasury
Need deed from address	Use Parcel Viewer to obtain parcel ID, then Landmark.	Recorder
Parcel search finds no old deed	Use name/legal searches; parcel indexing was not consistently used historically.	Landmark / Archives
Need pre-August 1991 document	Contact King County Archives.	Archives
Exact boundary uncertain	Do not rely on Parcel Viewer alone; locate survey/plat and obtain professional survey help.	Recorder / Surveyor

Official final-action routes

King County Address, Parcel & Tax Action Center

Search by Address Find parcel number, map location, Assessor report and district report. Open eReal Property Values, characteristics, legal description, levy information and sales history. View / Pay Tax Current tax balance, delinquency and online payment. Search Recorded Documents Deeds, mortgages, liens, plats, surveys and document copies.

Exactly 10 King County property answers

King County Assessor Property Search by Address FAQs

1. How do I search King County property by address?

Open King County Parcel Viewer, select Address in the search control and enter the street address. Choose the correct property, copy its parcel number and click Property Report to open the Assessor’s parcel information.

2. Can I search King County eReal Property by address?

Yes. King County’s property-research guidance states that eReal Property supports searches by address, parcel number or condominium/apartment complex name. Parcel Viewer is particularly useful when you also need to see the property on a map.

3. How many digits are in a King County parcel number?

King County property research guidance describes the Assessor tax parcel number as usually ten digits. A county example is 806100-0045. Real-property tax account numbers can be 10 or 12 digits in the Treasury system.

4. Who is the King County Assessor in 2026?

John Wilson is the current King County Assessor. The Assessor’s customer service office is at 201 South Jackson Street, second floor, Seattle, WA 98104. The main phone number is 206-296-7300.

5. When are King County property taxes due in 2026?

The first half was due April 30, 2026 and monthly late charges began May 1 on unpaid first-half taxes. The second half is due October 31, 2026 and becomes delinquent November 1 if unpaid.

6. Is the King County 2026 assessment appeal deadline already over?

Not necessarily. July 1 is the general filing date, but King County allows a petition by the later of July 1 or 60 calendar days after the valuation notice mailing date. Because notices are mailed from May through November, some parcel-specific 2026 deadlines can fall after July 1.

7. How do I find the actual appeal deadline for my King County property?

Use King County eAppeals and enter the property address or parcel number. The county specifically directs taxpayers to this lookup to see the filing due date associated with the parcel’s valuation notice.

8. Who qualifies for King County senior or disabled property tax relief?

King County’s current exemption portal includes qualifying homeowners who own and occupy their principal residence and meet age, disability or disabled-veteran criteria. For reductions on 2024, 2025 and 2026 property taxes, the current household-income limit is $84,000 after allowed deductions.

9. How do I search a King County deed if I only know the property address?

First search the address in Parcel Viewer and obtain the parcel number. Then open the King County Recorder’s Landmark search and search by parcel, owner name or other indexed information. The Recorder system itself does not maintain a street-address search field.

10. Are King County Parcel Viewer boundary lines legally exact?

No. Parcel Viewer is an excellent research and mapping tool, but exact property boundaries should be verified with recorded plats, surveys, deeds and, when necessary, a licensed survey professional.

Official Sources & 2026 Verification

King County Assessor John Wilson, office information, eReal Property, tax relief and 2026 physical inspection links. King County Parcel Viewer Address and parcel-number lookup, map selection, Property Report and District Report. eReal Property Assessor property information, values, characteristics, levy rates and sale history. Property Research Official explanation of eReal, Parcel Viewer, iMap, district reports, tax links and recorded-document connections. 2026 Property Taxes April 30, July 1, September 1 and October 31 calendar dates plus current 2026 tax information. Treasury Property Taxes Live property-tax account lookup, payment and 2026 card service-fee information. Board of Appeals & Equalization July 1 / 60-day filing rule, evidence requirements and appeal process. Senior Exemption Portal Current age/disability, occupancy and $84,000 income qualification information. Limited-Income Deferral $57,000 income threshold, September 1 deadline, ownership and equity rules. King County eSales Residential comparable-sale search by area, sale date, size, grade, condition and other property features. 2026 Levy Rates Official taxing-district codes, rates and county tax-estimation formula. Recorder Records Search Landmark deed, mortgage, lien, parcel, legal-description and recording searches.

Verified August 12, 2026: Assessor John Wilson, address-search workflow, Parcel Viewer, eReal Property, 2026 first/second-half tax dates, 2.35% card-payment service fee, July 1/60-day appeal rule, $84,000 senior/disabled exemption income threshold, September 1 limited-income deferral deadline, 2026 levy-rate availability, Recorder search rules and office contacts were checked against current King County government systems.

CountyPropertyAppraiser.org is an independent informational website. It is not affiliated with King County, the King County Assessor, Treasury Operations, Recorder’s Office, GIS Center, Board of Appeals and Equalization, Property Tax Advisor or Washington State government.

Property ownership, assessed values, levy rates, tax balances, late charges, appeal deadlines, exemption qualifications, recorded documents and government applications can change. Verify time-sensitive information with the responsible official agency before paying taxes, filing an appeal, applying for tax relief, purchasing property or relying on a land record.

Article slug: king-county-assessor-property-search-by-address

Value term	Simple meaning
Market value	The appraiser’s estimate of the property’s value as of the assessment date.
Assessed value	The value after limits or caps may be applied.
Exemptions	Approved reductions such as homestead or other exemptions.
Taxable value	The value used by taxing authorities after exemptions.