#1Ridgefield
Clark County10,367 in 2020·16,132 in 2025·+5,765 people
Ridgefield, #1 on this list · Photo: Jeff Silverstein / Jeffsilverstein at en.wikipedia · Public domainWashington rankings · Growth
Fastest-growing towns in Washington
Ridgefield has grown fastest of Washington’s 149 towns of 2,500+: up 55.6% from 10,367 residents in April 2020 to an estimated 16,132 in July 2025 (Census Bureau estimates). The typical town here changed +3.5%; 37 of the 149 lost residents.
Census Bureau population estimates, Vintage 2025: July 1, 2025 against the April 2020 base, both on January 2025 town lines (people a town annexed are in its base, not its growth). Estimates, not counts. Unincorporated communities (census-designated places) get no estimate, so they aren’t listed. A described list: no letters. How grades work
#1+55.6%
#2Black Diamond
King County4,695 in 2020·6,978 in 2025·+2,283 people
#3Sultan
Snohomish County5,167 in 2020·7,230 in 2025·+2,063 people
All 149 towns
Growth since 2020, highest first.
149 towns ranked. Not here? See why a town may be missing.
#TownGrowth since 2020People addedResidents
Quick answers
Questions people ask
What is the fastest-growing town in Washington?
Ridgefield (Clark County): it grew 55.6%, from 10,367 residents in April 2020 to an estimated 16,132 in July 2025. Black Diamond (+48.6%) and Sultan (+39.9%) follow.
How are these towns ranked?
By the percent change in residents from the Census Bureau’s April 2020 estimates base to its latest July 1 estimate, highest first, on the exact change: two towns shown with the same tenth of a percent keep the order of their unrounded figures, and only an identical change shares a rank (T). The base is the 2020 Census count redrawn on today’s town lines, so a town that annexed land since 2020 changes only by births, deaths and moves, not by the people it took in. How grades work.
Why isn’t my town on this list?
The list covers the towns TownRatings grades that had 2,500+ residents in the 2020 estimates base (149 in Washington). Census-designated places (unincorporated communities) have no Census Bureau estimates, so they never appear; a town incorporated since 2020, or one TownRatings merges with its twin township, isn’t listed either. Every town is on the Washington page.
Go deeper
All Washington rankings →More Washington lists
Every list ranks the same 2,500+ towns, so a town’s rank means the same thing on each.
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