RANKING · 2020 CENSUS · 14 SHOWN OF 14

Largest by population, Massachusetts counties · 2020

The most populous Massachusetts counties as of the 2020 population estimates. This list covers the 14 counties in Massachusetts that qualify, ranked against each other statewide.

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SAME RANKING BYCities States Metros ZIP codes

RELATEDFastest growing Fastest shrinking Most population gained Most population lost Most densely populated Most sparsely populated

YEAR1990 2000 2010 2020 2025

RANKPLACESTATETOTAL POPULATIONVS 2000

01Middlesex County, MAMA1,632,002+11%

02Worcester County, MAMA862,111+15%

03Essex County, MAMA809,829+12%

04Suffolk County, MAMA797,936+16%

05Norfolk County, MAMA725,981+12%

06Bristol County, MAMA579,200+8%

07Plymouth County, MAMA530,819+12%

08Hampden County, MAMA465,825+2%

09Barnstable County, MAMA228,996+3%

10Hampshire County, MAMA162,308+7%

11Berkshire County, MAMA129,026−4%

12Franklin County, MAMA71,029−1%

13Dukes County, MAMA20,600+37%

14Nantucket County, MAMA14,255+50%

SHOWING 1–14 OF 14

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU DECENNIAL CENSUS