| County Population Centroids for Massachusetts |
| ST | COU | COUNTY NAME | POPULATION | LATITUDE | LONGITUDE |
| 25 | 001 | Barnstable | 222,230 | 41.690295 | -70.328016 |
| 25 | 003 | Berkshire | 134,953 | 42.463230 | -73.217343 |
| 25 | 005 | Bristol | 534,678 | 41.791630 | -71.107952 |
| 25 | 007 | Dukes | 14,987 | 41.419527 | -70.603215 |
| 25 | 009 | Essex | 723,419 | 42.623629 | -70.983958 |
| 25 | 011 | Franklin | 71,535 | 42.579031 | -72.562434 |
| 25 | 013 | Hampden | 456,228 | 42.126022 | -72.575124 |
| 25 | 015 | Hampshire | 152,251 | 42.311857 | -72.576317 |
| 25 | 017 | Middlesex | 1465396 | 42.448531 | -71.253895 |
| 25 | 019 | Nantucket | 9,520 | 41.269931 | -70.092208 |
| 25 | 021 | Norfolk | 650,308 | 42.203151 | -71.146372 |
| 25 | 023 | Plymouth | 472,822 | 42.026290 | -70.856195 |
| 25 | 025 | Suffolk | 689,807 | 42.333258 | -71.078720 |
| 25 | 027 | Worcester | 750,963 | 42.306288 | -71.806896 |
