Ranking of Massachusetts Counties By Total Voting-age Population (18yrs and over) from Census 2020

Updated on August 22, 2023.

According to the data from the US 2020 Census, as at April 2020, among all the counties in Massachusetts, Middlesex County had the highest voting-age population (18 years and over) (1.31M), followed by Worcester County (683.59K), and Suffolk County (670.29K).

The chart below shows the top 10 counties with high voting-age population, and the table below shows the ranking of all Massachusetts counties based on voting-age population.

You can also see the ranking of counties by population for other states as well as for the whole United States.

Ranking of Massachusetts Counties By Total Voting-age Population from Census 2020
Middlesex
1.31M
Worcester
683.59K
Suffolk
670.29K
Essex
640.84K
Norfolk
577.34K
Bristol
461.88K
Plymouth
419.52K
Hampden
367.44K
Barnstable
196.28K
Hampshire
138.41K
Ranking of Massachusetts Counties By Total Voting-age Population from Census 2020
Rank
County
Voting-age Population
1 Middlesex County 1,313,737
2 Worcester County 683,585
3 Suffolk County 670,286
4 Essex County 640,842
5 Norfolk County 577,336
6 Bristol County 461,876
7 Plymouth County 419,524
8 Hampden County 367,439
9 Barnstable County 196,284
10 Hampshire County 138,414
11 Berkshire County 106,768
12 Franklin County 58,799
13 Dukes County 17,281
14 Nantucket County 11,552
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