Search the King County Assessment Record and Follow the Parcel to the Right Record
King County’s Assessor maintains the property valuation record. The fastest starting point is eReal Property when you know an address or parcel number; Parcel Viewer is better when you also need a map, jurisdiction, levy-code context or help identifying the parcel.
Washington assesses real property at 100% of true and fair market value, so there is no separate 19%, 35% or 40% assessment ratio to calculate. The more important questions are which assessment year you are viewing, which levy area applies and whether you need an Assessor record, tax account, deed or historical record.
Quick answer: use eReal Property for the assessment and Parcel Viewer when you need the map
Open the official King County eReal Property Search when you want assessed value, property characteristics, levy information, sale history or tax-roll history. Use the King County Parcel Viewer when you need to identify a parcel visually or search by address, parcel number or condo name.
King County property-record facts
Choose the King County property question you need answered
Assessment data, tax billing, recorded deeds and historical records sit in different County systems.
The Assessor, Treasury, Recorder and GIS answer different property questions
Property facts
Sales history
Jurisdiction
Levy code
Payment
Balance
Liens
Recorded documents
Evidence
Decision
What you need |
Official source |
Best use |
Do not confuse it with |
|---|---|---|---|
Assessed value and property characteristics |
Assessor eReal Property |
Current value, property details, levy and sale information. |
Final amount currently due. |
Parcel location or mapped context |
King County Parcel Viewer |
Address, parcel, condo, jurisdiction and map research. |
Legal boundary survey. |
Property tax balance or payment |
Treasury Operations |
Tax statement, installments, payment and delinquency. |
Assessor’s market-value record. |
Deed, mortgage, lien, plat or recorded document |
Recorder’s Office / Landmark |
Recorded real-estate documents. |
Treating eReal owner data as a title search. |
Formal value appeal |
Board of Equalization |
Challenge true and fair market value. |
Appealing solely because the tax bill increased. |
How to search a King County tax assessment record
eReal Property is the Assessor’s primary property-information system. King County also links to it from its property research and tax-payment pages when a taxpayer needs to find a parcel number from an address.
- Open the official eReal Property Search.
- Accept any site acknowledgment shown by the County system.
- Enter the street address using the search fields provided.
- Open the result that matches the physical property.
- Save the parcel number before moving to another County system.
- Use the parcel number from a tax statement or value notice.
- Enter it in the Assessor search.
- Confirm the site address before using the record.
- Review valuation and property details.
- Reuse the same parcel ID for tax or Recorder research where supported.
- Use Parcel Viewer or eReal search options available for a condo/apartment complex.
- Do not assume the mailing or unit address is the parcel address.
- Open the matching parcel or unit record.
- Verify the parcel number.
- Continue into the complete eReal Property report.
After the property report opens
Use Parcel Viewer when the map helps identify the property
Parcel Viewer supports searches by address, parcel number or condo name. After selecting a parcel, the map can display summary information and link into the full Assessor Property Report and the Districts and Development Conditions Report.
“King County property records” can mean five different records
Record |
What it can answer |
Official source |
Useful search clue |
|---|---|---|---|
Assessment record |
Assessed value, property characteristics, valuation history and sale information. |
eReal Property |
Address or parcel number |
Parcel map |
Mapped parcel location, jurisdiction, levy code and links to reports. |
Parcel Viewer |
Address, parcel or condo name |
Property-tax account |
Amount due, installment status and online payment. |
Treasury Operations |
Parcel/tax account number |
Recorded land document |
Deeds, mortgages, liens, plats, surveys and other recorded documents. |
Recorder / Landmark |
Name, parcel, recording number or legal search |
Historical property record |
Older assessment rolls, historical property cards and pre-digital records. |
King County Archives / Puget Sound Regional Archives |
Parcel number, legal description, name and date |
What to inspect before relying on a King County assessment
Field |
What it tells you |
What to verify |
Why it matters |
|---|---|---|---|
Parcel number |
County identifier for the property account. |
Match it across Assessor, Treasury and Recorder research. |
More reliable than using address text alone. |
Site address |
Location associated with the parcel. |
Correct property and unit. |
Mailing addresses and parcel addresses can differ. |
Appraised / assessed value |
King County’s annual market-value assessment. |
Assessment year. |
The assessment year normally funds taxes in the following year. |
Property characteristics |
Land and improvement facts used in appraisal work. |
Building size, use, lot information and relevant features. |
A factual error can affect value. |
Sale history |
Transactions connected with the parcel. |
Date, price and whether the sale was market-based. |
Sale context matters when judging value. |
Levy code / rate |
Taxing-area information associated with the parcel. |
Correct tax year and levy area. |
There is no single property-tax rate for all of King County. |
Tax-roll history |
Prior value / tax-roll information available through the property report. |
Year-by-year comparison. |
Useful for understanding how the assessment changed over time. |
King County assesses property at 100% of true and fair value
No separate residential assessment ratio
Washington law requires real and personal property to be valued at 100% of true and fair value unless another law provides a different treatment. King County describes true and fair value as market value.
That is very different from states where an assessor first determines market value and then applies a percentage such as 19% or 35%. In King County, a $900,000 market assessment is generally a $900,000 assessed value before exemptions or special programs.
How residential value is developed
A 2026 assessment is generally used for taxes payable in 2027
This timing causes frequent confusion. King County assesses most property as of January 1 of an assessment year, and that value is generally used for property taxes paid the following year.
Use the parcel’s levy rate—not a countywide average—to estimate tax
King County’s Assessor publishes levy-rate reports and uses a straightforward estimate: assessed value divided by 1,000, multiplied by the parcel’s levy rate per $1,000.
King County tax-estimate calculator
Enter the assessed value from the property record and the levy rate for the correct tax year and levy area.
Formula: assessed value ÷ 1,000 × levy rate. The official Treasury account controls the actual amount due.
Use the tax account when you need the amount due or payment status
King County property taxes are normally paid in two installments. The first half is due April 30 and the second half is due October 31. If a due date falls on a weekend or County holiday, King County’s tax FAQ says payment is due the next business day.
Item |
2026 guidance |
What to do |
|---|---|---|
First-half taxes |
April 30 |
This regular 2026 installment date has passed. |
Second-half taxes |
October 31 |
Check the live Treasury account before paying; weekend/holiday rules can shift the operational due date. |
Taxes under $50 |
Full payment due with the first-half deadline |
Do not assume a second installment exists for a very small bill. |
eCheck |
$0.55 service fee |
Review the payment screen before submitting. |
Credit / debit / PayPal |
2.35% service fee; $2 minimum |
The processor fee is separate from the property tax. |
International credit card |
3.95%; $2 minimum |
Verify the live fee displayed by the payment system. |
After opening the payment system
July 1 has passed, but the 60-day notice rule can still matter
King County’s Board of Equalization requires a valuation petition to be filed by July 1 of the assessment year or within 60 days from the mailing date printed on the valuation notice, whichever gives the taxpayer the applicable filing window.
What King County requires in a valuation petition
If the assessment is accurate but the bill is difficult, check tax relief separately
An exemption does not mean the Assessor’s market value is wrong. King County administers a separate property-tax exemption program for qualifying seniors, people with disabilities and qualifying disabled veterans.
Use the Recorder or Archives when eReal is not the record you need
King County’s Recorder search covers most documents recorded on or after August 1, 1991 online. Landmark supports searches by name, document type, parcel ID, recording number, legal description and other indexing fields.
King County Archives and the Puget Sound Regional Archives hold older assessment rolls and historical property record cards. The historical record cards can include legal descriptions, building use, construction details and photographs.
King County Assessor contact and office map
King County Department of Assessments
King County tax assessment search and property record FAQs
1. Where do I search King County property assessment records?
Use the King County Assessor’s eReal Property Search for valuation, property characteristics, levy information and sales history. If you need to identify a parcel on a map first, use King County Parcel Viewer.
2. Can I search a King County property by address instead of parcel number?
Yes. King County property research tools support address searches. Once you find the property, save its parcel number because Treasury and Recorder searches are easier when you have the exact parcel identifier.
3. Is King County property assessed at full market value?
Yes. Washington generally requires property to be assessed at 100% of true and fair value, which means market value. King County does not apply a separate residential assessment percentage such as 19% or 35%.
4. Why does a 2026 King County tax bill usually use an earlier assessment?
King County assesses most property as of January 1 of the assessment year, and that value is generally used for taxes payable the following year. A 2026 tax bill therefore generally traces to the 2025 assessment year.
5. Where can I see a King County property’s prior values and tax-roll history?
Use the Assessor’s eReal Property report. King County’s property research guidance says value history and tax-roll history are available through the property details portion of the report.
6. What is the difference between Parcel Viewer and eReal Property?
Parcel Viewer is map-centered and helps identify parcels, jurisdiction information and mapped context. eReal Property is the detailed Assessor record for valuation, characteristics, levy information, sales and related property data.
7. When are King County property taxes due in 2026?
The regular installment dates are April 30 for the first half and October 31 for the second half. King County says that when a due date falls on a weekend or County holiday, the payment is due the next business day.
8. Can I still appeal a King County 2026 assessment after July 1?
Possibly. The standard deadline is July 1 of the assessment year, but King County also allows filing within 60 days from the mailing date on the valuation notice. Check the actual notice date or the County’s eAppeals filing information before assuming the deadline has passed.
9. Where do I search King County deeds, liens or recorded documents?
Use the King County Recorder’s Office online records search and Landmark system. The Assessor record is for property valuation and does not replace recorded deed or title research.
10. Are King County Parcel Viewer boundary lines legally accurate?
They are not a legal survey. King County states that Parcel Viewer lot lines are approximate and the map is not intended for legal boundary use. Use recorded survey documents and professional surveying when exact boundaries matter.
Official resources reviewed for this page
- King County Assessor — Assessor identity, eReal Property, valuation services, tax relief and contact information.
- Residential property taxes — annual market-value assessment, January 1 valuation date and appraisal methods.
- King County Property Research — eReal Property and Districts and Development Conditions research workflow.
- King County Parcel Viewer — parcel, address and condo search plus mapped record information.
- King County valuation appeal guidance — July 1 / 60-day filing rule and appeal requirements.
- King County Treasury property taxes — tax-account research and payment deadlines.
- King County Property Tax Payment — current online payment methods and service fees.
- King County Recorder online records search — deeds, liens, plats, surveys and other recorded-document research.
Khushboo Bobade is the editor and digital publisher of CountyAuditors.org. She oversees the research and editorial process for the website, ensuring that information about county auditor offices, property records, and government resources is accurate, verified, and easy for visitors to understand.
10 Ohio Property Tax Calculators & Auditor Tools
Built specifically for Ohio's 35% assessment ratio, current DTE forms, and 2026 Homestead, Owner-Occupancy, CAUV, Conveyance Fee, and Board of Revision rules. Every number reflects verified Ohio Department of Taxation amounts.
Annual Tax Bill Estimator
OHIOApplies Ohio's 35% assessment ratio plus your county's effective millage tier — the actual math your auditor uses.
Homestead Reduction Calculator
DTE 105A2026 Ohio Homestead: $29,000 general or $58,000 enhanced (100% disabled vet, KIA spouse). OAGI under $41,000 required for non-veteran applicants.
Owner-Occupancy & Non-Business Credits
DTE 105CEvery Ohio owner-occupied home qualifies for the 2.5% Owner-Occupancy Credit plus the automatic 10% Non-Business Credit. Most owners don't realize these stack.
Conveyance Fee Calculator
ORC 322When you sell or transfer Ohio property, the auditor collects $1 state + up to $3 county per $1,000, plus $0.50 per parcel. Counties choose their rate.
CAUV Agricultural Savings
DTE 109Ohio's Current Agricultural Use Value cuts taxable value dramatically for farmland (10+ acres, or smaller with $2,500+ annual gross income).
Mill Rate Converter
Ohio tax rates appear three ways on auditor sites: mills, percent, or dollars per $1,000. Convert between them instantly.
Parcel Number Cleaner
Ohio's 88 counties each format parcels differently — Franklin uses 010-123456-00, Cuyahoga uses 001-23-456, Hamilton uses 100-0001-0001-00. Auto-detects.
35% Ratio Sanity Check
Ohio law sets taxable value at 35% of market value. If yours is significantly higher, you're a strong BOR appeal candidate.
BOR Appeal Savings
DTE 1A successful Board of Revision complaint typically cuts your value 10–20%. Filing is free and stays in effect until the next reappraisal.
BOR Deadline Countdown
MAR 31Ohio's statutory Board of Revision filing deadline is March 31 for the prior tax year. Miss it and you wait until next year — no extensions.
Verify with the official Ohio source
These calculators use the verified 2026 Ohio Department of Taxation amounts and statutory rules. For your exact bill, exemption status, and county-specific deadlines, always confirm with your county auditor and the Ohio Revised Code:
Estimates use Ohio's 35% statutory assessment ratio and effective tax rate tiers averaged across major Ohio counties. Your actual bill depends on local school levies, voted millage, inside vs. outside millage splits, House Bill 920 reduction factors (HB 920), and special assessments. The 2026 Homestead general amount ($29,000) and enhanced amount ($58,000) reflect HB 187 inflation indexing — your county auditor's office may show slightly different transitional figures. Nothing here is legal or tax advice. CountyAuditors.org is an independent informational directory, not affiliated with any county government.