King County Assessor Property Search 2026: Owner & Parcel

King County, Washington • verified August 11, 2026

Find a King County Parcel Without Using the Wrong Search

Use King County Parcel Viewer or eReal Property for a free address, parcel or condo lookup; use Treasury Operations for tax balances and payments; and use the Recorder’s Landmark system when your starting point is an owner name, deed, mortgage, lien, plat or recorded document.

This guide explains the owner-name workaround, address formatting, parcel IDs, GIS boundaries, 2026 tax dates, current payment fees, valuation appeals, senior and disabled exemptions, deferrals, deed-copy costs, record corrections and the exact office to contact when the data looks wrong.

Search by Owner or Name Search by Address 2026 Tax Help

Direct Assessor lookup Address / Parcel / Condo Parcel Viewer does not provide a direct owner-name input.

Name-only research Use Recorder Landmark Search recorded documents by last name and first name.

Next 2026 tax date October 31 Second-half property tax due date; weekend/holiday rules can apply.

2026 assessment appeal July 1 / 60-day rule A later value-notice mailing date can create a later filing deadline.

Fast Answer: Which King County Property Tool Do You Need?

Know the street address? Start with Parcel Viewer or eReal Property. Know the parcel number? Use eReal Property for assessment detail. Know only an owner or company name? Use the Recorder’s Landmark name search, identify the matching recorded property, then return to Parcel Viewer/eReal. Need tax payment? Use Treasury Operations. Need a formal value appeal? Use the Board of Appeals and Equalization.

Independent-site disclosure: AssessorPropertySearch.org is an informational guide and is not King County Government, the King County Assessor, Treasury Operations, Recorder’s Office or Board of Appeals and Equalization. Do not send this website bank details, exemption documents, Social Security numbers or other sensitive property-owner information.

Can You Search King County Property by Owner Name?

This is the most important search-intent correction on the page: the current Assessor Parcel Viewer directly offers Address, Parcel number and Condo name searches, not a public owner-name input box.

If you know the address

Search Parcel Viewer by address. Select the correct parcel. The parcel summary can show the taxpayer name plus address, appraised value, lot area, levy code and related reports.

Official King County GIS Search Parcel Viewer

If you know only a person’s name

Use the free Recorder Landmark database. Its official Name Search uses the format Last Name, First Name. Review deeds and other recorded instruments, then match the legal or parcel information back to Assessor records.

Official King County Recorder Search Recorded Records

If you want every property owned by a person

Do not assume a recorded-name result is a perfect portfolio list. Indexing changes over time, names can vary, ownership may be held through trusts or entities, and Washington law restricts commercial use of lists of individuals.

Name-only lookup workflow

Open Recorder Landmark

Choose the Name Search rather than attempting to force a name into Parcel Viewer.

Enter the name in Recorder format

Start with Doe, John. If results are weak, shorten the first name, review company/trust variants or adjust the date range.

Identify a relevant deed or land record

Compare recording date, grantor/grantee, legal description and parcel information rather than selecting a document only because the name matches.

Copy the parcel ID or address

Recorded documents can provide the clues needed to identify the property in Parcel Viewer or eReal Property.

Return to the Assessor tools

Confirm the current parcel, taxpayer display, assessed value and property characteristics through Parcel Viewer/eReal Property.

Grantor vs grantee: in Recorder results, a grantor is generally the giving party and a grantee is the receiving party. Which side matters depends on the document and transaction you are researching.

Assessor, Parcel Viewer, Treasury, Recorder or Appeals Board?

King County Assessor

Use for assessed value, valuation notices, property characteristics, eReal Property, exemptions, deferrals, destroyed-property relief, manifest errors and general assessment questions.

King County Department of Assessments Open Assessor

Parcel Viewer

Use when you have an address, parcel number or condo name and want map context, approximate parcel lines, taxpayer information and links to complete property reports.

King County GIS Center Open Parcel Viewer

Treasury Operations

Use for tax statements, balances, payments, electronic-payment fees, delinquency, payment plans and tax-payment customer service.

Official King County tax portal View Property Taxes

Recorder’s Office

Use for deeds, mortgages, liens, releases, plats, surveys, recorded ownership changes, certified copies and name-based land-record research.

Official King County Recorder Recorder Search Help

Board of Appeals and Equalization

Use for a formal property-assessment appeal after receiving the applicable valuation notice or other appealable determination.

Independent county appeals board Review Appeal Process

Property Tax Advisor

Use when you need neutral help understanding assessment procedures, comparable sales, levies or the appeal process before filing.

King County Tax Advisor

Phone: 206-477-1060

How to Search King County WA Property Records by Address

Address search is the easiest path when you do not already have the parcel or tax account number.

Open Parcel Viewer or eReal Property

Parcel Viewer is especially useful when you need an address-to-map workflow. eReal Property is best once you have the parcel or tax account number and want detailed assessment information.

Enter a simple street address

Start with the house number and main street name. Avoid unnecessary punctuation or extra location wording if the first search fails.

Choose the correct parcel

Compare address, jurisdiction, taxpayer display, parcel number and map location before relying on the result.

Open the complete property report

Use the selected-parcel links to review eReal Property information, assessed value, property characteristics, sale history and related district information.

Save the parcel/tax account number

This identifier makes later tax, Recorder, appeal and map research much more precise than repeatedly guessing address formatting.

Move to the correct final-action system

Use Treasury for payment, Recorder for deeds, or the Appeals Board for a formal valuation challenge.

King County Property Search by Address: Free Search Fixes

Start simple

Use house number plus the main street name. If the result fails, remove unnecessary direction, suffix, punctuation or unit wording and try again.

Use the map when text fails

Parcel Viewer lets you zoom to an area and select a visible parcel, which is useful for vacant land, waterfront property, unusual addresses and jurisdiction-edge parcels.

Save the ID after one success

Once you locate the correct parcel, stop relying on address variations. Save its parcel/tax account number.

Free-search answer: King County’s official property-research systems are public tools. You do not need to purchase a private report simply to search an address, parcel or condo and review Assessor information.

King County Assessor Parcel Search

A parcel number is the best exact-match identifier when the address is duplicated, has changed, belongs to a condo or does not format cleanly.

Where you found the number	How to use it	Important distinction
Property Value Notice	Use the parcel/account number in eReal Property or Parcel Viewer.	Make sure you are viewing the correct assessment year.
Property tax statement	Use the parcel/tax account to open the Treasury payment account.	Real-property tax accounts may be displayed with 10 or 12 digits depending on the system.
Parcel Viewer	Select the parcel visually and save the displayed parcel number.	Map boundaries are approximate.
Recorded document	Use the first 10 parcel-ID digits for the Recorder’s parcel search where applicable.	Recorder parcel-ID searching retrieves recorded documents from 1997 forward.
Closing/title paperwork	Use it as a starting clue, then confirm against the current King County record.	Do not assume an old document reflects a later parcel split or combination.

Address-to-parcel shortcut: if you need a tax account number for payment, search the address once in the Assessor/Parcel Viewer system, copy the parcel number, then move to the Treasury portal.

King County Condo and Apartment Complex Property Search

Parcel Viewer includes a dedicated Condo name search, which can be more reliable than a unit address when the Assessor’s site-address format differs from mailing or building signage.

Search the condo or complex name

Use Parcel Viewer’s Condo name option when a unit address produces no clean result.

Select the individual parcel

Condominium units can have separate parcel/tax accounts. Confirm the correct unit before reviewing value or taxes.

Use Recorder records for legal documents

Declarations, amendments, plats and recorded condo documents belong in the Recorder system rather than being inferred from the Assessor map.

King County Assessor Property Search Map: Parcel Viewer

Parcel Viewer is the most useful map-based search when you need visual context instead of a text-only Assessor report.

What you can search

Street address.
Parcel number.
Condo name.
Cross streets.
Visible parcels on the map.

What a selected parcel can show

Parcel number.
Address.
Jurisdiction.
Taxpayer name.
Appraised value.
Lot area.
Levy code.
Units/buildings.

Advanced map functions

Select multiple parcels by line or polygon.
Export selected parcel information.
Turn address-point and parcel-number layers on or off.
View King County zoning context.
Measure approximate area or distance.
Open a complete Property Report or Districts Report from a selected parcel.

Do not use parcel lines as a survey: King County explicitly labels Parcel Viewer lot lines as approximate and not for legal use. A fence, easement, encroachment or exact boundary issue should be checked against recorded plats/surveys and professional surveying when necessary.

Official King County GIS Parcel Viewer Open King County Parcel Map

What a King County eReal Property Record Can Tell You

Record item	Useful for	Do not assume
Parcel/account number	Exact Assessor, map and tax-account matching.	It is the same as a Recorder recording number.
Taxpayer / owner display	Seeing the name currently carried with the assessment record.	It replaces a title search or proves no newer document exists.
Site address	Confirming physical property location.	It is always the same as the taxpayer mailing address.
Appraised / assessed value	Understanding the value used in the property-tax process.	It equals the amount of tax due.
Property characteristics	Checking land, building, use and assessment facts.	Every characteristic is immune from data-entry or timing errors.
Sales history	Assessment research and comparable-sale context.	Every transaction is an arms-length market sale.
Levy code / rate context	Understanding which taxing districts affect the parcel.	A countywide single tax rate applies to every property.
Map/report links	Moving between parcel, district and development-condition research.	GIS information establishes legal ownership or boundary location.

Data-use limitation: the eReal Property system warns that information can be affected by changes and that users rely on it at their own risk. It also displays Washington’s restriction against using lists of individuals for commercial purposes.

Official King County eReal Property Open eReal Property

2026 Tax Bill vs 2026 Assessment: Do Not Mix the Years

King County assesses property every year, but the assessment year normally comes before the tax year in which that value is used.

Taxes being paid in 2026

King County explains that for taxes paid in a given year, most residential properties were valued as of January 1 of the prior year. The 2026 tax bill therefore should not automatically be compared with a new 2026 valuation notice as though both belong to the same assessment cycle.

2026 assessment

A 2026 assessment generally determines taxes payable in 2027. If you appeal the 2026 assessed value, keep that later tax-year relationship in mind when deciding which tax bill or notice you are reviewing.

Quick diagnostic: when a tax bill “does not match” the value you just received, first write down the assessment year, tax year, parcel number and levy code. Many apparent mismatches are year or taxing-district issues rather than calculation errors.

King County 2026 Property Tax Dates

April 30, 2026 — first half due

The first half of annual property tax was due April 30. If the full annual tax was less than $50, the entire amount was due at that time.

May 1 — late charges begin on delinquent first-half tax

If the required first-half amount was not timely paid, delinquency charges begin under Washington law.

July 1 — standard Board appeal date

July 1 is the ordinary calendar deadline, but the separate value-notice 60-day rule can provide a later applicable filing date.

September 1, 2026 — limited-income deferral deadline

Eligible owners seeking the limited-income second-installment deferral must meet the program requirements and apply by September 1.

October 31, 2026 — second half due

The second-half annual property-tax installment is due October 31, subject to King County’s next-business-day rule when a due date falls on a weekend or county holiday.

Mortgage escrow does not remove your responsibility to check: King County states that taxpayers remain responsible for making sure taxes are paid on time even when a mortgage company handles the payment.

Official King County 2026 property-tax information Review 2026 Tax Dates

Pay King County Property Tax: Methods, Fees and Confirmation

Method	Current guidance	Before you submit
Online credit card	The 2026 payment portal lists a 2.35% service fee with a $2 minimum.	Confirm parcel, installment and displayed processor fee.
Online debit card	The live 2026 portal currently says debit and credit cards are subject to the same 2.35% / $2 minimum rule.	A separate county information page still shows a conflicting flat debit fee, so trust the fee displayed at checkout.
eCheck	County payment guidance lists a $0.55 convenience fee.	Verify bank details, parcel number and current displayed fee.
Mail	Pay by check and include the tax account number on the memo line.	Use the correct Treasury mailing address and preserve proof of timely mailing.
In person	King Street Center customer service is available during listed weekday service hours.	Confirm holiday/closure status before traveling.
Secure drop box	A Treasury drop box is available inside the security-gate area during access hours.	Do not deposit cash; clearly identify the tax account.

After an online payment

Save the payment-confirmation screen.
Save the confirmation email.
Record the payment date and transaction number.
Check your bank or card account for successful processing.
Recheck the county tax account after processing.
Contact Treasury if the payment reverses or does not appear correctly.

Posting time: the county says an online payment may take time to appear in county records even after bank/card processing. A confirmation record is therefore worth keeping until the tax account reflects the payment.

Official King County tax payment portal View or Pay Property Taxes

King County 2026 Property Assessment Appeal

As of August 11, the ordinary July 1 date has passed, but a 2026 appeal can still be timely if the applicable Property Value Notice or other determination was mailed late enough for the 60-day rule to extend the deadline.

Deadline rule: the 2026 Real Property Petition states that the petition must be filed or postmarked by July 1, 2026 or within the applicable 60-day period after the mailing date on the Official Property Value Notice or other determination. If filing after July 1 based on the later-notice rule, include a copy of that notice/determination.

Before filing

Review eReal property characteristics first. If the issue is a clear data error and the Assessor corrects it to a value you accept, a formal appeal may not be necessary.

File the correct petition

Real property includes homes, vacant land and commercial real estate. Separate appeal forms exist for personal property, current-use decisions and exemption/deferral determinations.

One petition per parcel

The 2026 Real Property Petition requires a separate petition for each parcel being appealed.

What the petition needs

Assessor parcel number.
Owner/appellant name and contact information.
Signature and filing date.
Property description and relevant characteristics.
Assessor’s value.
Your opinion of true and fair market value.
Specific reasons the assessment is incorrect.
Supporting evidence.
Representative authorization when applicable.
Value notice or other determination when required.

Evidence that helps more than “my taxes are too high”

Comparable property sales.
Qualified appraisal.
Photos documenting material condition.
Contractor repair estimates.
Evidence of easements or development restrictions.

Environmental or sensitive-area restrictions.
Incorrect building or land characteristics.
Maps supporting a location-related value issue.
For income property, required income/expense and lease information.
A clear market-value conclusion tied to the evidence.

Evidence deadline: additional evidence from the taxpayer and Assessor is due 21 business days before the hearing. Waiting until the hearing date to produce a new appraisal or repair estimate can create an evidence-admissibility problem.

Hearing and decision

The Board can hold an oral hearing, and alternative/no-attendance procedures are available in appropriate situations. King County generally sends the hearing date in advance. If you later disagree with the Board decision, a further appeal to the Washington Board of Tax Appeals generally has its own 30-day deadline from the decision mailing date.

Taxes still matter while the appeal is pending: King County instructs owners to pay taxes by their regular deadlines to avoid interest and penalties even when an assessment appeal has not yet been decided.

Official King County Board of Appeals and Equalization

How to Appeal 2026 Appeal Forms

2026 Senior, Disabled and Disabled-Veteran Property Tax Exemption

This program reduces qualifying property taxes; it is different from a payment deferral and different from an appeal of market value.

Income

For a reduction on 2026 property taxes, King County currently lists a maximum household income of $84,000 after applicable qualified-expense deductions under the program.

Age / disability

The program includes qualifying senior, disabled and certain service-connected disabled-veteran applicants. Apply the full current eligibility rules rather than using age alone.

Home

The property must satisfy ownership and principal-residence/occupancy requirements for the applicable program year.

2026 paper-application checklist

Parcel number.
Owner/applicant information.
2025 household income information for the 2026 application.
Proof of age or qualifying disability where required.
Ownership/residence information.
Trust, life-estate or cooperative ownership documents when applicable.
Relevant spouse/partner or co-owner information.
Qualified-expense documentation when claimed.
Signature.

Protect sensitive documents: King County’s application instructions warn applicants not to email sensitive application documents. Redact Social Security numbers and account numbers where the instructions permit and use the online portal, mail or secure drop-off route provided by the Assessor.

Paper follow-up: the 2026 instructions tell applicants to contact the office if they do not receive confirmation within about six weeks. This is a follow-up checkpoint, not a promise that every application will be fully approved within six weeks.

Official King County exemption resources

Check Eligibility / Apply Download 2026 Forms

King County Tax Deferral Options: Do Not Confuse Them With Exemptions

Program	Main current requirements	Important consequence
Limited-income deferral	Own property at least 5 years; live there January 1; occupy it at least 6 months during the application year; prior-year household income $57,000 or less; meet equity rules.	State pays 50% on your behalf; deferred tax and interest become a lien.
Limited-income deadline	Pay the first half before applying to defer the second installment; apply by September 1.	The program must be reapplied for annually.
Senior / disability deferral	Different program with age/disability, ownership/occupancy, income and equity requirements.	A deferral delays tax rather than forgiving it; deferred tax and interest remain a lien until repaid.

August 2026 action point: the September 1 limited-income deferral deadline has not yet passed. If you think the program fits, review the official requirements now rather than waiting until the October tax deadline.

Official King County limited-income deferral Review Deferral Eligibility

Wrong Square Footage, Damaged Property or Other Assessor Error?

Not every problem requires the same appeal form. Separate a factual record error from a market-value disagreement or disaster-related value loss.

Manifest error

A clear property-description mistake—such as incorrect house or lot square footage—may qualify for King County’s manifest-error correction process. Depending on the evidence and circumstances, refunds can reach back as far as six years.

Destroyed or damaged property

Fire, flood, storm or other destruction can have a separate relief route. Keep photos, insurance/adjuster material, incident reports and repair/rebuild estimates.

Market-value disagreement

If the property facts are correct but you believe the assessed market value is too high, use the regular valuation-review/appeal process rather than a manifest-error request.

Official Assessor correction resources

Manifest Error Corrections Destroyed Property Relief

King County Deed, Mortgage, Lien and Recorded Document Search

Use Recorder records when your question is about the actual recorded instrument rather than the Assessor’s current property summary.

Search by name

Landmark supports name searching. The official example uses last name, comma, first name: Doe, John.

Search by parcel

Enter the first 10 digits of the Parcel ID using the appropriate “Starts With” option. Parcel-ID searching retrieves recorded documents from 1997 forward.

Search by legal record

Landmark can also search document type, book/page, consideration, recording date, recording number, legal description and Torrens number.

No address field in Recorder search? Start in Parcel Viewer with the street address, copy the parcel ID, then use the Recorder’s parcel or legal search.

Online coverage

Most documents recorded on or after August 1, 1991 are available through the online Recorder system. Older documents are generally held on microfilm through King County Archives. Remember that the narrower parcel-ID search itself only retrieves recorded documents from 1997 forward.

Current copy fees

Copy	Current listed 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
Non-recorded uncertified document	$0.15 per page
18×24 bond map	$3 uncertified / $5 certified per page
18×24 Mylar map	$5 uncertified / $7 certified per page
Conformed-copy label	$1 per instrument

Certified online orders: King County explains that uncertified copies can be available electronically after purchase, while certified copies ordered online are mailed so the official certification can be preserved.

Official King County Recorder

Recorder Search Instructions Open Landmark Search Recorded Copy Fees

Free Recording Activity Alerts With King County RANS

King County’s Recording Activity Notification System is a free email alert service that notifies subscribers when a land-record document matching a subscribed personal or business name is recorded.

Useful for

Monitoring your personal name.
Monitoring a business name.
Learning quickly that a matching land record was recorded.
Reducing the need to manually search Landmark every week.

What it does not guarantee

An alert is a monitoring tool, not automatic proof of fraud, title ownership or a valid claim against your parcel. Review the actual recorded document when you receive an unexpected alert.

Official King County Recorder RANS Register for Recording Alerts

New King County Homeowner Property-Record Checklist

Assessor and parcel

Confirm the deed was recorded.
Find the property by street address.
Save the parcel/tax account number.
Check taxpayer/owner display.
Review building and land characteristics.
Check current assessed value and levy code.

Tax and documents

Check the Treasury tax account separately.
Confirm whether mortgage escrow will pay.
Know April and October payment dates.
Review exemption eligibility when applicable.
Keep the Property Value Notice.
Consider RANS recording alerts for your name.

King County Assessor Property Search Not Working?

Problem	Likely reason	Best next step
Cannot search by owner name	Parcel Viewer does not have a direct owner-name search field.	Use Recorder Landmark Name Search, then cross-check the parcel in Assessor tools.
Address gives no result	Formatting, unit complexity or unusual site address.	Shorten the address or use Parcel Viewer visually.
Condo unit is missing	Unit/site address differs from the searchable complex format.	Search Parcel Viewer by Condo name and select the unit parcel.
Parcel and tax bill seem different	Assessment year, tax year or account format may be getting mixed together.	Match parcel, assessment year, tax year and levy code.
Owner appears outdated	Recent recorded transfer may not yet be reflected consistently in every system.	Verify the recorded deed, then ask the Assessor about the current ownership display.
House square footage is wrong	Potential manifest property-description error.	Gather evidence and review King County’s Manifest Error Correction route.
Tax payment not showing	Posting delay or rejected transaction.	Keep confirmation, verify bank processing, then call Treasury at 206-263-2890.
Map boundary conflicts with fence	Parcel Viewer lines are approximate.	Use recorded surveys/plats and professional surveying for a legal boundary issue.
Recorder parcel search finds nothing before 1997	Parcel-ID searching is limited to 1997-current documents.	Try name, recording date, legal description or another Landmark search method.
Need a pre-August 1991 document	Older records generally are not in the online image collection.	Use King County Archives/microfilm guidance.

King County Property Offices, Phones and Visit Details

Office	Use it for	Current contact
King County Assessor	Assessment, eReal, value, property data, exemptions and corrections.	John Wilson, Assessor 201 S. Jackson St., 2nd Floor, Seattle, WA 98104 206-296-7300 Mon–Fri 8:30 a.m.–4:30 p.m.
Senior / Disability Exemptions	Exemption eligibility, application and status.	206-296-3920 Exemptions.Assessments@kingcounty.gov
Treasury Operations	Property tax statements, balances, payments and delinquency.	201 S. Jackson St., Suite 710, Seattle, WA 98104 206-263-2890 Mon–Fri 8:30 a.m.–4:30 p.m.
Board of Appeals and Equalization	Formal assessment appeals and appeal forms.	516 3rd Ave., Room 1222, Seattle, WA 98104-2306 206-477-3400 BOE@kingcounty.gov
Property Tax Advisor	Appeal, levy and assessment-procedure assistance.	206-477-1060 taxadvisor@kingcounty.gov
King County Recorder	Deeds, mortgages, liens, plats, surveys, copies and recording search.	201 S. Jackson St., Suite 204, Seattle, WA 98104 206-477-6620 In-person 8:30 a.m.–4:30 p.m.; recording ends 3:30 p.m.

Assessor call script

“I’m calling about parcel [number] at [address]. I need help with the [owner display / 2026 value / property characteristic / exemption / manifest error], and I have the current value notice available.”

Treasury call script

“I’m calling about tax account/parcel [number]. I need to confirm the 2026 [second-half balance / payment / delinquency / payment plan] and I have my transaction information available.”

Recorder call script

“I’m researching a recorded property document. I have the [name / parcel ID / recording date / legal description]. Which Landmark search or copy method is best for this record?”

Before You Rely on a King County Property Record

The parcel number matches the intended property.
The site address and map location match.
The taxpayer/owner display is understood as an assessment record, not a complete title opinion.
The assessment year is correct.
The tax year is correct.
The levy code/taxing-district context is understood.
Recorded ownership documents have been checked when ownership matters legally.
Parcel Viewer boundaries have not been treated as survey lines.
Electronic-payment fees were checked at live checkout.
Deadline-sensitive appeal or exemption action was verified through the current official form/page.

Official King County Property Action Links

The article above explains the task first. Use these official systems when you are ready for the live lookup, payment, application, appeal or recorded-document action.

eReal Property

Assessment values, property characteristics, levy information and sale history.

Open eReal Property

Parcel Viewer

Address, parcel-number and condo-name map searching.

Open Parcel Viewer

Property taxes

View real or personal property tax accounts and make payments.

View Tax Account

Assessment appeal

Check deadline, evidence requirements and filing routes.

Appeal Instructions

Senior / disabled exemption

Review current qualification details and apply through the secure portal.

Check Tax Relief

Recorded documents

Name, parcel, document, legal-description and recording searches.

Open Landmark

King County Assessor Property Search FAQs

What is the official free King County assessor property search?

Use King County eReal Property and Parcel Viewer. Parcel Viewer provides free searches by address, parcel number or condo name, while eReal Property provides detailed assessment, property-characteristic, levy and sale-history information.

Can I search King County property by owner name for free?

The current Parcel Viewer does not provide a direct owner-name search box. If you know only a person or company name, use the free King County Recorder Landmark Name Search, identify the relevant recorded property, then confirm the parcel in Parcel Viewer or eReal Property.

How do I search King County property by address?

Start with Parcel Viewer using the street address. Select the matching parcel, confirm the taxpayer name and map location, then open the related Property Report or save the parcel number for eReal Property and tax research.

How do I search a King County parcel number?

Use the parcel or tax account number in Parcel Viewer or eReal Property. If researching recorded documents, the Recorder says to enter the first 10 digits of the Parcel ID using its parcel-search instructions; that Recorder parcel search covers records from 1997 forward.

Where can I view the King County assessor parcel map?

Use King County Parcel Viewer. It supports address, parcel-number and condo-name searches, map selection, multiple-parcel selection, export and zoning/address layers. Its lot lines are approximate and are not for legal boundary use.

What is the 2026 King County property assessment appeal deadline?

The standard deadline is July 1, 2026, but a petition can also be timely under the applicable 60-day period tied to the mailing date of the Official Property Value Notice or other determination. Owners relying on a later notice should check the exact notice date immediately.

When is the second half of 2026 King County property tax due?

The standard second-half due date is October 31, 2026. King County applies a next-business-day rule when a due date falls on a weekend or county holiday, so confirm the live payment portal before the deadline.

What is the 2026 King County senior or disabled exemption income limit?

King County currently lists a maximum household income of $84,000 for reductions on 2026 property taxes, subject to the program’s complete income, ownership, occupancy, age or disability requirements.

Where do I search King County deeds and ownership history by name?

Use the King County Recorder Landmark system. It supports name searching as well as document type, parcel ID, recording date, recording number, legal description and other fields. The official Name Search example uses last name, comma, first name.

Is the King County Parcel Viewer map a legal survey?

No. King County explicitly states that Parcel Viewer lot lines are approximate and not for legal use. For an exact property boundary, use recorded plats or surveys and obtain professional surveying help when appropriate.

Best Next Step

If you have an address, start with Parcel Viewer and save the parcel number. If you have only an owner name, start with Recorder Landmark and work from the recorded document back to the parcel. Once the parcel is confirmed, use eReal for assessment information and Treasury for the tax account.

For an appeal, exemption, deferral, tax payment, certified deed copy or legal boundary issue, use the official action page linked beside that workflow and verify the current deadline or fee before submitting.