Massachusetts Population By County in 2021 (ACS-5Yrs)
Updated on February 28, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, the total population of Massachusetts was 6.99M. Among all Massachusetts counties, Middlesex was the most populated county (1.62M), followed by Worcester (856.86K), and then Essex (804.60K).
On the other hand, the least populated counties were: Nantucket (13.80K), Dukes (20.28K), and Franklin (71.08K).
The chart and table below shows the population of each county and the percentage of Massachusetts population in each county.
You can see similar information for other states and by state for the United States.
Related Topics: Massachusetts ACS-5Yrs Estimates, 2021 Topic List.
Data Source: US Census - ACS 5-Year Estimates, 2021 Census.
Massachusetts Population By County in 2021
Massachusetts Population By County in 2021
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| County | Population | % of State Population |
|---|---|---|
| Barnstable | 227942 | 3.26 |
| Berkshire | 129089 | 1.85 |
| Bristol | 576070 | 8.24 |
| Dukes | 20277 | 0.29 |
| Essex | 804598 | 11.51 |
| Franklin | 71085 | 1.02 |
| Hampden | 466265 | 6.67 |
| Hampshire | 161810 | 2.31 |
| Middlesex | 1623411 | 23.22 |
| Nantucket | 13795 | 0.20 |
| Norfolk | 720403 | 10.30 |
| Plymouth | 527602 | 7.55 |
| Suffolk | 792647 | 11.34 |
| Worcester | 856858 | 12.26 |