Washington Counties by Population (2025)

The most populous counties in Washington are King County with 2,271,380, Pierce County at 928,696, Snohomish County with 844,761, Spokane County at 551,455, and Clark County with 521,150. You can get the most current Census population data for all 39 Washington counties, sorted from the most populous counties in Washington to the least, according to the 2023 Population Estimates Program.

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