| | Worcester County | MA | 25027 | | Worcester, MA 49340 | Boston-Worcester-Providence,
MA-RI-NH-CT 148 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=WorcesterCounty+MA |
| | Franklin County | MA | 25011 | | Greenfield, MA 24640 | Springfield-Amherst
Town-Northampton, MA 521 | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=FranklinCounty+MA |
| | Hampden County | MA | 25013 | | Springfield, MA 44140 | Springfield-Amherst
Town-Northampton, MA 521 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=HampdenCounty+MA |
| | Hampshire County | MA | 25015 | | Amherst Town-Northampton,
MA 11200 | Springfield-Amherst
Town-Northampton, MA 521 | Central | metro county (urban) | federal/state
government-dependent | https://maps.google.com/?q=HampshireCounty+MA |