King County Assessor Property Search: Find eReal Property Records, Tax Bills, Parcel Viewer Maps and Deeds
If you are looking for King County property records, the fastest path depends on what you need. The Department of Assessments gives you eReal Property data, values, property characteristics, levy rates and sale history. Treasury Operations handles property tax bills and payments. The Parcel Viewer helps you locate parcels by address, parcel number or condo name. The Recorder’s Office handles deeds, mortgages, plats, surveys and official recorded documents.
This guide shows you the correct official route for property search, parcel lookup, address search, tax records, senior exemption help, personal property reporting, appeals, GIS maps and recorded documents, without sending users to private property-record pages first.
Choose the Correct King County Property Tool
King County property research is split across several official systems. Choose the task first, then open the matching official page.
eReal Property Search: Values, Characteristics, Levy Rates and Sale History
Use King County Department of Assessments eReal Property Search when you need valuation data, property characteristics, levy rates, sale history, parcel details and assessment information.
Where to Search King County Property Records in 2026
For most users, start with King County Assessor eReal Property Search if you need property value, building characteristics, sale history or levy-rate details. Use King County Parcel Viewer when you want to search by map, parcel number, address or condo name. Use Treasury Operations property tax resources when you need the tax bill, payment deadline, receipt or payment status. Use the Recorder’s Office online records search when you need deeds, mortgages, plats, surveys, liens or official recorded documents.
Use eReal Property for property values, parcel details, characteristics, levy rates and sale history.
Use Treasury Operations for property tax payments, tax deadlines, payment reminders, bills and receipts.
Use Recorder records for deeds, mortgages, plats, surveys, liens and other official recorded documents.
Do not confuse assessed value with the amount due. The Department of Assessments values property and administers tax relief programs, while Treasury handles property tax payment information. The Recorder’s Office is the better source for recorded legal documents.
Verified Official Resource Status
Publish-ready as of: May 15, 2026. This guide was checked against official King County resources before writing, including the Department of Assessments, eReal Property Search, Parcel Viewer, Treasury Operations, property tax payment system, Recorder’s Office, online records search, senior and disabled tax relief information, and Board of Equalization appeal resources.
No private aggregator, copied directory, or guessed search URL is used as the main source. Some official King County tools open on separate county application domains such as blue.kingcounty.com, gismaps.kingcounty.gov, payment.kingcounty.gov and recordsearch.kingcounty.gov.
What This King County Property Assessor Search Guide Covers
Before You Search King County Property Records, Keep These Details Ready
King County tools work best when you use clean property identifiers. If you have the parcel number, that is usually the most direct path. If not, start with address search or Parcel Viewer.
Best details to search with
- 10-digit parcel number if available
- Property street address
- Condo name if searching a condominium parcel
- Owner or taxpayer name if using recorded-document systems
- Recording number, book/page or parcel ID for deed research
- Tax year if checking payment or bill records
Best way to avoid wrong records
- Use the official King County tool for the exact task
- Compare parcel number before paying or appealing
- Use eReal Property for assessment details
- Use Treasury for bills and payments
- Use Recorder records for deeds and mortgages
- Use Parcel Viewer for map-based confirmation
If you do not know the parcel number, start with Parcel Viewer by address. Once you find the parcel, use its links or parcel number to open eReal Property, tax information and related research pages.
How to Search King County Assessor Property Records Online
Start with eReal Property if you need assessment details
Open the King County eReal Property Search when you need property value information, characteristics, sale history, levy rates and assessment details.
Use Parcel Viewer if you need to find the parcel first
Open King County Parcel Viewer if you only know the address, condo name or approximate map location. Once a parcel is selected, use the links to reach deeper property information.
Check the parcel number and site address
Before using the record, compare the parcel number, site address, building data, sale history and value year. Seattle, Bellevue, Renton, Kent, Redmond, Kirkland and unincorporated areas can have similar street names.
Move to Treasury if the question is about payment
For tax payment deadlines, bills, receipts and payment questions, use King County property tax information or the official property tax payment system.
Use Recorder records for deeds and legal documents
For deeds, mortgages, liens, plats, surveys and recorded instruments, use the King County online records search or Recorder’s Office resources.
How to Read King County eReal Property and Assessor Records Correctly
A King County property record can include parcel data, value information, sale history, building characteristics, levy rates and links to other county resources. Read it in layers instead of reacting to one number.
Parcel Number
King County parcel search commonly uses a 10-digit parcel number. Save it before moving between eReal Property, Parcel Viewer, tax payments and Recorder records.
Property Address
Use this to confirm the physical parcel. Do not confuse it with mailing address, owner contact address or tax billing contact.
Property Characteristics
Review building count, square footage, year built, land data and other characteristics. Wrong characteristics can affect valuation questions.
Assessed Value
This is the value used in the property tax system. It is not the same thing as your tax bill, sale price or mortgage estimate.
Sale History
Sale history can help with research, but recorded documents are still the stronger source when legal ownership or recording details matter.
Levy Rates
Levy-rate details help explain tax calculation, but your final bill still comes from Treasury and depends on the applicable tax year and taxing districts.
If a building size, bathroom count, property class or sale history looks wrong, take screenshots and contact the Department of Assessments before filing an appeal. A record correction and a valuation appeal are not always the same workflow.
King County Property Tax Bills, Payments, Deadlines and Receipts
Use Treasury Operations when your question is about the bill, due date, receipt, payment status, property tax reminder or personal property tax bill. The Department of Assessments values property, but Treasury is the better route for payments and tax bill questions.
Use property tax records for
- Real property tax bills
- Payment status
- Online payment
- Payment deadlines
- Receipts and payment confirmation
- Personal property tax bill questions
Do not use tax records alone for
- Full assessment explanation
- Recorded deed proof
- Survey-grade parcel boundaries
- Legal ownership chain
- Property characteristic corrections
- Senior exemption eligibility review
Before paying, confirm the parcel number, property address, tax year and amount due. Save the confirmation page or receipt. Do not pay using a link from an email, ad or private website unless it clearly routes to the official King County payment system.
King County Parcel Viewer, GIS Map and Property Research Help
King County Parcel Viewer is useful when you need a map-based search. It can help you locate a parcel by parcel number, address or condo name, then connect to related property research tools.
Use Parcel Viewer when you need
- Map-based parcel lookup
- Parcel number from an address
- Condo-name search
- Nearby parcel context
- Links to assessor reports
- District and development-condition research
Do not use Parcel Viewer alone for
- Legal boundary disputes
- Survey measurements
- Final deed interpretation
- Tax payment proof
- Recorded easement research
- Title insurance decisions
Parcel maps are useful for research, but they are not a substitute for a survey, recorded plat, deed review or professional boundary opinion. Use Recorder records and survey documents when legal boundaries matter.
King County Deed Records, Mortgages, Plats, Surveys and Official Records
Use the Recorder’s Office when you need official recorded documents. The Recorder records and preserves documents such as real estate deeds, mortgages, plats, surveys and registered land records.
Open the online records search
Use King County Landmark Web Official Records Search for online recorded-document research.
Search by the strongest document clue
Use recording number, parcel ID, legal description, book/page, document type, record date or name search depending on what you have.
Do not rely only on eReal Property for legal proof
Assessment data is helpful, but deed history, mortgages, liens, surveys and plats should be verified through the Recorder’s Office or a qualified title professional.
Assessor and tax records are not title reports. For purchase, refinance, estate, lien, divorce, easement or boundary decisions, verify recorded documents through the official Recorder’s Office and professional advice when needed.
King County Senior, Disabled Person and Disabled Veteran Property Tax Relief
The King County Assessor administers property tax relief programs for qualifying seniors, disabled persons and disabled veterans. The Assessor’s official page says the State of Washington gives seniors a tool to help remain in their homes, and King County encourages eligible users to apply online for faster processing.
Use tax relief resources when
- You are age 61 or older and own your home
- You are a disabled person
- You are a disabled veteran
- You need exemption or deferral program information
- You need income-threshold guidance
- You need application support
Helpful official contacts
- Senior and disability exemptions: 206-296-3920
- Assessor main phone: 206-296-7300
- Property Tax Advisor: 206-477-1060
- Email: Assessor.Info@KingCounty.gov
Income thresholds, age rules, disability rules and veteran qualification rules can change. Use the official tax relief portal or contact the Assessor before assuming you do or do not qualify.
How to Appeal a King County Property Valuation
If you disagree with the assessed value of real or personal property, the King County Board of Equalization hears and decides appeals of assessed value and other actions of the Assessor. Appeals are evidence-based, so collect proof before filing.
Before you appeal, collect
- Parcel number and tax year
- Current eReal Property record
- Recent comparable sales
- Photos of condition issues
- Evidence of incorrect building data
- Repair estimates or professional appraisal if available
Do not appeal only because
- The tax bill increased
- You dislike the levy rate
- Your mortgage escrow changed
- A neighbor paid less tax
- A private website shows a different estimate
- The market feels lower without evidence
The strongest appeals focus on market value evidence and property-specific errors, not only on the final tax bill. If your issue is a missing exemption, use the tax relief path instead of filing the wrong kind of appeal.
King County Personal Property Tax and Business Equipment Reporting
King County also has personal property tax reporting for business equipment and supplies. This is different from a normal residential parcel search. Business owners should use the official personal property reporting resources rather than the eReal Property search alone.
Personal property may include
- Business equipment
- Furniture and fixtures
- Tools and supplies
- Commercial assets
- Taxable business property
Official help paths
- Business equipment and supplies lists: 206-296-5126
- Personal property tax information: 206-263-2844
- Email: Personal.Property@kingcounty.gov
Do not use a residential parcel search as a substitute for personal property reporting. Business personal property follows a separate reporting and tax process.
King County Assessor Property Search Not Working? Try These Fixes
If eReal Property, Parcel Viewer or the payment system does not show what you expect, do not assume the record is missing. Often the issue is formatting, tool choice or update timing.
Try these first
- Search by 10-digit parcel number if available
- Use Parcel Viewer when you only know the address
- Remove apartment/unit text from the first search
- Try condo name if it is a condo parcel
- Check the tax year before paying
- Compare eReal Property with tax payment records
If still not found
- Check Recorder records for recent sale documents
- Use parcel number instead of owner name
- Call the Assessor with address and parcel details
- Use Treasury if the issue is a payment or bill
- Use Recorder if the issue is deed or mortgage documents
- Try again later if a county application is under maintenance
King County Assessor Contact, Office Address, Phone Numbers and Map
King County’s Department of Assessments is the main office for property values, eReal Property, assessment questions, tax relief and appeal-related assessment issues. Treasury and Recorder resources handle payment and recorded-document issues separately.
King County Department of Assessments
Address: King Street Center Customer Service Center, 201 South Jackson Street, 2nd Floor, Seattle, WA 98104
Mailing: KSC-AS-0708, 201 South Jackson Street, Seattle, WA 98104
Phone: 206-296-7300
Email: Assessor.Info@KingCounty.gov
Hours: Monday–Friday, 8:30 am–4:30 pm
Which King County office should you contact?
Assessor: values, characteristics, exemptions, tax relief, personal property and appeal-related assessment questions.
Treasury: property tax payment, tax bill, receipt, deadline and account payment questions.
Recorder: deeds, mortgages, plats, surveys, recorded documents and copies.
Map: King County Department of Assessments
201 South Jackson Street, Seattle, WA 98104
Official King County Property Search, Tax Records, Parcel Viewer and Deed Links
King County Assessor
Main Department of Assessments page for property values, tax relief, appeals and property information.
Open AssessoreReal Property Search
Search King County property values, characteristics, levy rates and sale history.
Open eReal PropertyParcel Viewer
Search parcels by parcel number, address or condo name using the county GIS tool.
Open Parcel ViewerProperty Tax Information
Use Treasury Operations resources for property tax bills, deadlines, reminders and payment help.
Open Property TaxesProperty Tax Payment System
Official county payment application for King County property taxes.
Open Tax PaymentRecorder’s Office
Use for deeds, mortgages, plats, surveys, copies and recorded documents.
Open RecorderOnline Records Search
Search King County official recorded documents through Landmark Web.
Open Records SearchSenior Exemption Portal
Apply online for senior, disabled person or disabled veteran property tax relief where eligible.
Open Tax ReliefAssessment Appeals
Use the Board of Equalization resources for property tax assessment appeal forms and process details.
Open AppealsPersonal Property Reporting
Use when reporting business equipment, supplies and taxable business personal property.
Open Personal PropertyProperty Research
King County property research and maps guidance, including eReal Property report help.
Open Property ResearchAssessor Contact
Use for Department of Assessments phone, email, mailing address and office help.
Open Contact PageKing County Assessor Property Search FAQs
How do I search King County property records online?
Use King County eReal Property Search for assessment records, property characteristics, assessed value, levy rates and sale history. Use Parcel Viewer if you need to find a parcel by address, parcel number or condo name first.
Can I search King County property by parcel number?
Yes. eReal Property and Parcel Viewer support parcel-based research. King County parcel searches commonly use a 10-digit parcel number with no hyphens or spaces.
Can I search King County property by address?
Yes. Parcel Viewer is a good starting point when you know the property address but not the parcel number. After selecting a parcel, use the official links to open the eReal Property report and related information.
Is King County eReal Property the same as the tax bill?
No. eReal Property shows assessment information such as values, characteristics, levy rates and sale history. Treasury Operations handles property tax bills, deadlines and payment information.
Where do I pay King County property taxes?
Use King County Treasury Operations property tax resources or the official property tax payment system. Always confirm the parcel, tax year, address and amount due before paying.
Where can I find King County deed records?
Use the King County Recorder’s Office or Landmark Web Official Records Search for deeds, mortgages, plats, surveys, liens and other recorded documents.
How do I appeal a King County property valuation?
Use King County Board of Equalization appeal resources. Before filing, gather parcel details, eReal Property data, comparable sales, photos and evidence of property-specific errors.
Who handles King County senior property tax exemptions?
The King County Department of Assessments administers tax relief programs. The senior and disability exemption help number is 206-296-3920, and the county encourages eligible users to apply online where possible.
Is King County Parcel Viewer enough for a boundary dispute?
No. Parcel Viewer is useful for research and orientation, but it is not a substitute for a survey, recorded plat, deed review or legal boundary advice.
What should I do if the King County property search shows no result?
Try Parcel Viewer by address, search by 10-digit parcel number, remove unit text or punctuation, verify the tax year, and check Recorder records if the property recently sold or was recorded under a different document reference.
Best Way to Search King County Property Records Without Getting the Wrong Result
The safest King County workflow is to start with eReal Property or Parcel Viewer, confirm the parcel number and address, then move to Treasury for tax bills or the Recorder’s Office for deed records. For exemptions, appeals and property characteristics, use the Department of Assessments.
This route prevents the most common mistakes: confusing assessed value with the tax bill, using a private property-record site before official county data, relying on maps for legal boundaries, or treating assessment records as deed records.