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. The median across all 14 is +4,543.

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SAME RANKING BYCities States Metros

RELATEDLargest by population Fastest growing Fastest shrinking Most population lost Most densely populated Most sparsely populated

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS 2000

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

02▲2Worcester County, MAMA888,502+26,391−36%

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

04▲2Plymouth County, MAMA546,829+16,010−57%

05▲2Bristol County, MAMA593,640+14,440−49%

06▼1Norfolk County, MAMA739,749+13,768−60%

07▲1Barnstable County, MAMA233,539+4,543−87%

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

09▲2Dukes County, MAMA21,219+619−82%

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

11▲2Franklin County, MAMA70,698-331−123%

12▲2Berkshire County, MAMA128,224-802−82%

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

14▼12Suffolk County, MAMA791,891-6,045−123%

SHOWING 1–14 OF 14

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU POPULATION ESTIMATES