King County
Property Tax Guide

Property taxes in King County, Washington, represent one of the largest revenue sources for local government services, funding everything from public schools and fire protection to parks and libraries. For the 2025 tax year, King County will collect approximately $7.7 billion in property taxes, representing a modest 1.6% increase from the previous year's $7.6 billion. This increase reflects the county's continued growth, with total property values rising to $873 billion in 2025, up 4.8% from $833 billion in 2024.

King County's property tax system operates on a calendar year basis, with assessments based on the fair market value of your property as of January 1st each year. Unlike some states that reassess properties only when sold, King County revalues all properties annually with physical inspections conducted at least once every six years. The county follows Washington state's constitutional limit requiring property tax rates to provide no more than a 1% annual increase in revenue for most taxing districts, helping to moderate tax growth even as property values fluctuate.

What sets King County apart is its comprehensive approach to property tax relief, offering various exemptions for seniors, disabled individuals, and veterans, along with multiple convenient payment options including online payments and escrow management. The county also maintains an independent appeals process through the King County Board of Appeals and Equalization, ensuring property owners have recourse when they believe their assessments are incorrect.

Total Effective Rate Range: $8.00 - $15.00 per $1,000 of assessed value

Property tax rates in King County vary significantly based on your specific location and the combination of taxing districts that serve your property. The state imposes a base school levy ranging from $2.70 to $3.60 per $1,000 of assessed value, depending on the tax year and revenue growth calculations. Local school districts add their own levies, which can vary dramatically—some districts may have minimal additional levies while others may add $4-6 per $1,000 for local programs and facilities.

Your total tax rate depends on which city you live in (or if you're in unincorporated King County), your fire district, any special utility districts, and local improvement districts. For example, residents of Seattle will have different rates than those in Bellevue, Kent, or rural areas. The county assessor provides a detailed breakdown on each tax statement showing exactly which entities are taxing your property and at what rates.