Massachusetts Citizen Voting-age Population By County in 2011 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2011, the citizen voting-age population for Massachusetts was 4,645,085 and represented 71.33% of the total Massachusetts population.

Among all Massachusetts counties, Middlesex had the highest citizen voting-age population (1.04M), followed by Worcester (565.74K), and Essex (518.15K).

In terms of percentages, Barnstable had the highest percentage of its population being citizens of voting-age (79.48%), followed by Hampshire (78.90%), and Franklin (78.41%).

The chart and table below shows the citizen voting-age population of each county and the percentage of each county's population that were citizens of voting-age.

You can see similar information for other states and by state for the United States.

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Massachusetts Citizen Voting-age Population By County in 2011
Massachusetts Citizen Voting-age Population By County in 2011
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County Citizen Voting-age Population % of County Population
Middlesex 1035620 69.42
Worcester 565740 71.16
Essex 518150 70.07
Suffolk 480185 67.34
Norfolk 477295 71.62
Bristol 400515 73.18
Plymouth 357405 72.51
Hampden 335405 72.48
Barnstable 172180 79.48
Hampshire 124370 78.90
Berkshire 102700 78.27
Franklin 56060 78.41
Dukes 12380 75.70
Nantucket 7075 69.81