Massachusetts Population By County in 2020

Updated on August 1, 2024.

Based on the US Census Vintage data estimates, in 2020, the population of Massachusetts was 6,997,713. Among all Massachusetts counties, Middlesex had the highest population (1,628,235), followed by Worcester (859,669), and Essex (807,791). Nantucket was the least populated county (14,237).

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 2020
Massachusetts Population By County in 2020
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County Population % of State Population
Barnstable 228012 3.26
Berkshire 128619 1.84
Bristol 576772 8.24
Dukes 20593 0.29
Essex 807791 11.54
Franklin 70923 1.01
Hampden 464311 6.64
Hampshire 146616 2.10
Middlesex 1628235 23.27
Nantucket 14237 0.20
Norfolk 724554 10.35
Plymouth 530200 7.58
Suffolk 797181 11.39
Worcester 859669 12.29