Sammamish Property Tax Records
Sammamish property tax records are maintained and administered by King County, which handles all assessment, billing, and collection for real and personal property within the city. The King County Assessor values Sammamish parcels each year, and Treasury Operations processes all tax payments. You can find parcel data, assessed values, and payment options through the county's eReal Property portal and the online tax payment system. Taxes in Sammamish are due April 30 for the first half and in early November for the second half. This page explains where to find your records, how to pay, and what city and county resources are available to Sammamish property owners.
Sammamish Overview
King County Assessor and Sammamish Property Values
The King County Assessor values all Sammamish residential and commercial properties using two standard methods. The sales comparison approach reviews recent sales of similar properties in the neighborhood. The cost approach calculates what it would cost to replace the structure, subtracts depreciation, and adds land value. Your final property tax bill is based on your assessed value relative to the total taxable value in your community. Property taxes fund schools, roads, parks, libraries, hospitals, and fire districts throughout the county.
A rise in your Sammamish property value does not always mean a proportional rise in your tax bill. The amount each district may collect is constrained by state law, so your individual tax depends on what share of the community's total value your property represents. You can contact the Assessor at Assessor.info@kingcounty.gov or 206-296-7300. Property tax appeals can be filed online through the eAppeals system. You can also sign up on the Assessor's website to receive your assessment notice by email rather than by mail.
The Assessor provides a link to levy rate reports, exemption programs, and deferral information. Seniors, disabled veterans, and disabled persons may qualify for significant reductions in their Sammamish property tax bill if they meet the eligibility requirements.
The King County Assessor's portal is the main resource for Sammamish property valuations, exemption programs, and appeal information.
Start at the Assessor's site to check your Sammamish property's assessed value, find out if you qualify for an exemption, or file an appeal through eAppeals.
Search Sammamish Property Records Online
The King County eReal Property portal is the primary online search tool for Sammamish property tax data. You can enter a property address or parcel number to retrieve parcel-level information. The system shows property characteristics, assessed valuations, tax account status, and ownership details. Links from each property record connect to the King County Taxing Districts Codes and Levies PDF, the Parcel Viewer, the Property Tax Advisor, and the Washington State Board of Tax Appeals.
Washington State law under RCW 42.56.070(9) prohibits using lists of individuals from this system for commercial purposes. You must agree to that restriction before accessing data. The Assessor disclaims liability for errors, so use the portal for general reference and verify important data directly with county staff before making legal or financial decisions. The Recorder's Office is also accessible from the property research sidebar for recorded document searches.
The eReal Property system is your primary online tool for searching any Sammamish parcel's assessed value, tax account status, and ownership history.
Type in any Sammamish address in eReal Property to instantly see the assessed value, owner name, tax account number, and recent sale history.
Paying Sammamish Property Taxes
Sammamish property owners pay real and personal property taxes through the King County Treasury portal. For 2026, the first half is due April 30 and the second half is due November 2. Online payments by credit or debit card carry a 2.35% service fee with a $2.00 minimum. eCheck payments cost $0.55. King County does not receive any portion of these fees.
You can also pay by mail. Send a check, cashier's check, or money order to King County Treasury, 201 S. Jackson St., Suite 710, Seattle, WA 98104, with your property tax account number on the payment. In-person payments are accepted at the King County Customer Service Center at 201 S. Jackson St., second floor, Monday through Friday from 8:30 AM to 4:30 PM. A drop box is available on the corner of Second Avenue and South Jackson Street during the same hours.
For questions about your tax bill, call 206-263-2890 or email PropertyTax.CustomerService@kingcounty.gov. Mobile home and commercial personal property questions go to 206-263-2844. Tax foreclosure questions are handled at 206-263-2649. MAMS and Local Improvement District assessments are handled at 206-263-1893.
The King County Treasury payment portal lets Sammamish property owners pay taxes online with credit, debit, or eCheck options.
Sammamish property owners can pay their property taxes online at any time through the secure King County Treasury Operations payment site.
City of Sammamish Property Tax Resources
The City of Sammamish Finance Department is directed by Vicky Carlsen and provides a Property Tax Information card on its finance page. This card links to both county and city tax resources in one place. The Finance Department also covers Real Estate Excise Taxes (REET) for property transactions, sales and use taxes, the city fee schedule, and a Budget and Taxes at a Glance document for quick reference. City Hall can be reached at (425) 295-0500.
The city administers a utility tax program through its Finance Department. Under Sammamish Municipal Code Title 3.01 and Chapter 3.45, utility businesses operating in the city pay a utility tax. The city also offers a Low Income Household Utility Tax Relief rebate program. To qualify, a household must own or rent, be a full-time occupant within city limits for 12 months, and participate in either the Puget Sound Energy Home Energy Lifeline Program or the King County Property Tax Exemptions Program for Seniors and Persons with Disabilities. The rebate application form will be available by end of 2026 with submissions opening in January 2027.
Note: The City of Sammamish does not assess or collect property taxes. All assessment and collection functions belong to King County. The city's Finance page is a reference and navigation resource that directs you to the appropriate county tools.
Sammamish GIS and Parcel Maps
The King County Parcel Viewer covers all Sammamish parcels and is searchable by parcel number or street address. Once you select a parcel, the tool links directly to the King County Assessor's eReal Property report, property tax information, and other county resources. Layers include address points, parcel boundaries, parcel number labels, and King County zoning. This tool is accessible 24 hours a day and integrated with both the assessment and tax payment databases.
The City of Sammamish GIS Program provides its own online mapping tools through GIS Coordinator Beth Carpenter, reachable at bcarpenter@sammamish.us or (425) 295-0568. Online map applications include the Sammamish Property Tool, which has interactive layers for property, zoning, sensitive areas, and aerial imagery. The Development Activity Map shows active projects with contact information for assigned city staff. Engineering Records Vault provides access to approved construction plan sets and as-built drawings.
Additional city GIS resources include a Storm Bandit map of the stormwater system and PDF maps covering flow control, water quality, erosion hazards, critical drainage areas, and aquifer recharge zones. These city tools complement the county's property tax and assessment data by providing local planning and zoning context for any Sammamish parcel.
The King County Property Tax Advisor provides independent guidance for Sammamish property owners on appeals, levy codes, and taxpayer rights under state law.
Use the King County Parcel Viewer to find any Sammamish property on an interactive map and get direct links to its tax records and assessment details.
The King County Property Tax Advisor is independent of the Assessor's Office and the Board of Equalization. Under RCW 84.48.140, the Advisor helps Sammamish taxpayers understand how to appeal their valuations, explains levy codes, and clarifies taxpayer rights. Contact the Tax Advisor at taxadvisor@kingcounty.gov or 206-477-1060. The office provides referrals to the Assessor, the Board of Equalization, and the Board of Tax Appeals as needed.
King County Property Tax Records
Sammamish is in King County. All property tax records, assessment data, and tax collection for Sammamish flow through King County offices. For a complete overview of the county's assessment process, payment portal, exemption programs, and appeal steps, visit the King County property tax records page.
Nearby Cities
These cities are near Sammamish on the Eastside of King County.