#1Williamstown
Berkshire County7,520 in 2020·9,186 in 2025·+1,666 people
Williamstown, #1 on this list · Photo: Daderot · Public domainMassachusetts rankings · Growth
Fastest-growing towns in Massachusetts
Williamstown has grown fastest of Massachusetts’ 284 towns of 2,500+: up 22.2% from 7,520 residents in April 2020 to an estimated 9,186 in July 2025 (Census Bureau estimates). The typical town here changed +1.7%; 52 of the 284 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+22.2%
#2Bolton
Worcester County5,657 in 2020·6,477 in 2025·+820 people
#3Millis
Norfolk County8,461 in 2020·9,463 in 2025·+1,002 people
All 284 towns
Growth since 2020, highest first.
284 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 Massachusetts?
Williamstown (Berkshire County): it grew 22.2%, from 7,520 residents in April 2020 to an estimated 9,186 in July 2025. Bolton (+14.5%) and Millis (+11.8%) 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 (284 in Massachusetts). 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 Massachusetts page.
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All Massachusetts rankings →More Massachusetts lists
Every list ranks the same 2,500+ towns, so a town’s rank means the same thing on each.
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