| County | Rank | Change (2020) ↓ | 2025 Pop. | 2020 Pop. |
|---|---|---|---|---|
| Hampshire County | 1 | 11.12% | 165,112 | 148,589 |
| Middlesex County | 2 | 4.02% | 1,692,980 | 1,627,578 |
| Nantucket County | 3 | 3.98% | 14,806 | 14,239 |
| Worcester County | 4 | 3.8% | 889,683 | 857,092 |
| Norfolk County | 5 | 3.51% | 749,129 | 723,750 |
| Plymouth County | 6 | 3.39% | 546,373 | 528,454 |
| Dukes County | 7 | 3.22% | 21,243 | 20,580 |
| Essex County | 8 | 2.96% | 831,679 | 807,781 |
| Bristol County | 9 | 2.66% | 592,133 | 576,776 |
| Barnstable County | 10 | 1.89% | 232,381 | 228,060 |
| Suffolk County | 11 | 0.92% | 804,610 | 797,239 |
| Hampden County | 12 | 0.53% | 466,174 | 463,714 |
| Franklin County | 13 | -0.07% | 70,882 | 70,934 |
| Berkshire County | 14 | -0.94% | 128,589 | 129,812 |
Massachusetts's counties show varied growth patterns from 2020 to 2025. Hampshire County leads with 11.12% annualized growth, followed by Middlesex County (4.02%) and Nantucket County (3.98%). The largest counties are Middlesex County (1,692,980), Worcester County (889,683), and Essex County (831,679). Of the 14 counties in Massachusetts, 12 are growing while 2 have experienced population decline. Overall, counties averaged 2.93% annualized growth, with total population growing by 3.02% annually.
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