Massachusetts Population By County in 2015

Updated on January 29, 2024.

Based on the US Census Vintage data estimates, in 2015, the population of Massachusetts was 6,797,484. Among all Massachusetts counties, Middlesex[object Promise] had the highest population (1,586,107), followed by Worcester[object Promise] (818,446), and Suffolk[object Promise] (783,177). Nantucket[object Promise] was the least populated county (10,933).

Hover over or click on the counties in the map below to see the populations. The data can also be found in a table below. You can use the table to sort, filter, and explore the data further.

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

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Massachusetts Population By County in 2015
Massachusetts Population By County in 2015
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County Population % of State Population
Barnstable 214015 3.15
Berkshire 127950 1.88
Bristol 557104 8.20
Dukes 17290 0.25
Essex 777228 11.43
Franklin 70911 1.04
Hampden 469251 6.90
Hampshire 160885 2.37
Middlesex 1586107 23.33
Nantucket 10933 0.16
Norfolk 694774 10.22
Plymouth 509413 7.49
Suffolk 783177 11.52
Worcester 818446 12.04