RANKING · 2025 ESTIMATES · 14 SHOWN OF 14

Most population lost, Massachusetts counties

Massachusetts counties that lost 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. Biggest climber in the top 100 since 2020: Suffolk County, MA, up 12 places to #1.

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SAME RANKING BYCities States Metros

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

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS 2000

01▲12Suffolk County, MAMA791,891-6,045−123%

02▲1Hampden County, MAMA464,338-1,487+1713%

03▼2Berkshire County, MAMA128,224-802−82%

04▼2Franklin County, MAMA70,698-331−123%

05Nantucket County, MAMA14,758+503−86%

06▼2Dukes County, MAMA21,219+619−82%

07▼1Hampshire County, MAMA164,065+1,757−69%

08▼1Barnstable County, MAMA233,539+4,543−87%

09▲1Norfolk County, MAMA739,749+13,768−60%

10▼2Bristol County, MAMA593,640+14,440−49%

11▼2Plymouth County, MAMA546,829+16,010−57%

12Essex County, MAMA826,653+16,824−68%

13▼2Worcester County, MAMA888,502+26,391−36%

14Middlesex County, MAMA1,669,979+37,977−43%

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