RANKING · 2025 ESTIMATES · 14 SHOWN OF 14

Most densely populated, Massachusetts counties

Massachusetts counties ranked by residents per square mile (2025). This list covers the 14 counties in Massachusetts that qualify, ranked against each other statewide. The median across all 14 is 753.

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SAME RANKING BYCities States Metros

YEAR1990 2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION DENSITYVS 2000

01Suffolk County, MAMA791,89113,594+15%

02Middlesex County, MAMA1,669,9792,042+14%

03Norfolk County, MAMA739,7491,868+14%

04Essex County, MAMA826,6531,678+14%

05Bristol County, MAMA593,6401,073+11%

06Plymouth County, MAMA546,829830+16%

07Hampden County, MAMA464,338753+2%

08Barnstable County, MAMA233,539592+5%

09Worcester County, MAMA888,502588+18%

10Nantucket County, MAMA14,758319+55%

11Hampshire County, MAMA164,065311+8%

12Dukes County, MAMA21,219206+42%

13Berkshire County, MAMA128,224138−5%

14Franklin County, MAMA70,698101−1%

SHOWING 1–14 OF 14

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