RANKING · 2025 ESTIMATES · 14 SHOWN OF 14

Most population gained, Massachusetts counties

Massachusetts counties that added the most residents from the 2020 census to 2025, by raw count of people rather than percentage. This list covers the 14 counties in Massachusetts that qualify, ranked against each other statewide.

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SAME RANKING BYCities States Metros

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS 2000

01Middlesex County, MAMA1,669,979+37,977−43%

02Worcester County, MAMA888,502+26,391−36%

03Essex County, MAMA826,653+16,824−68%

04Plymouth County, MAMA546,829+16,010−57%

05Bristol County, MAMA593,640+14,440−49%

06Norfolk County, MAMA739,749+13,768−60%

07Barnstable County, MAMA233,539+4,543−87%

08Hampshire County, MAMA164,065+1,757−69%

09Dukes County, MAMA21,219+619−82%

10Nantucket County, MAMA14,758+503−86%

11Franklin County, MAMA70,698-331−123%

12Berkshire County, MAMA128,224-802−82%

13Hampden County, MAMA464,338-1,487+1713%

14Suffolk County, MAMA791,891-6,045−123%

SHOWING 1–14 OF 14

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU POPULATION ESTIMATES