Massachusetts Counties by Population (2026)
2026 Pop.
200K
400K
600K
800K
1M
1.2M
1.4M
1.6M
Top 5 Most Populous Counties
1,717,004
898,118
839,420
816,076
757,504
| County | 2026 Pop. ↓ | Area (mi²) | Density (/mi²) | Change (2020) |
|---|---|---|---|---|
| Middlesex County | 1,717,004 | 818 | 2,099 | 5.49% |
| Worcester County | 898,118 | 1.5K | 594 | 4.79% |
| Essex County | 839,420 | 493 | 1,703 | 3.92% |
| Suffolk County | 816,076 | 58 | 14,070 | 2.36% |
| Norfolk County | 757,504 | 396 | 1,913 | 4.66% |
| Bristol County | 595,673 | 553 | 1,077 | 3.28% |
| Plymouth County | 550,656 | 659 | 836 | 4.2% |
| Hampden County | 468,197 | 617 | 759 | 0.97% |
| Barnstable County | 232,192 | 394 | 589 | 1.81% |
| Hampshire County | 164,825 | 527 | 313 | 10.93% |
| Berkshire County | 128,452 | 927 | 139 | -1.05% |
| Franklin County | 70,893 | 699 | 101 | -0.06% |
| Dukes County | 21,425 | 103 | 208 | 4.11% |
| Nantucket County | 14,942 | 46 | 325 | 4.94% |
Sources
- US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
- US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
- American Community Survey (2009 - 2013)
- Census QuickFacts
- Historical Populations of States and Counties (1790 - 1990)