STATE ยท MA
Counties in Massachusetts
Massachusetts has 14 counties and county equivalents. The most populous is Middlesex County with 1,623,952 people (Census 2023 estimate).
| County | Type | FIPS | Population (2023) |
|---|---|---|---|
| Barnstable County | county | 25001 | 231,735 |
| Berkshire County | county | 25003 | 126,818 |
| Bristol County | county | 25005 | 581,841 |
| Dukes County | county | 25007 | 20,819 |
| Essex County | county | 25009 | 810,089 |
| Franklin County | county | 25011 | 70,836 |
| Hampden County | county | 25013 | 460,291 |
| Hampshire County | county | 25015 | 162,502 |
| Middlesex County | county | 25017 | 1,623,952 |
| Nantucket County | county | 25019 | 14,444 |
| Norfolk County | county | 25021 | 727,473 |
| Plymouth County | county | 25023 | 535,308 |
| Suffolk County | county | 25025 | 768,425 |
| Worcester County | county | 25027 | 866,866 |
Sources: U.S. Census Bureau geographic reference files; Census Bureau Population Estimates, Vintage 2023. Last reviewed 2026-10-27. Looking for yours? Find your county.