| | | Barnstable County | MA | 25001 | | Barnstable Town, MA 12700 | Boston-Worcester-Providence,
MA-RI-NH-CT 148 | Central | metro county (urban) | recreation | https://maps.google.com/?q=BarnstableCounty+MA |
| | | Berkshire County | MA | 25003 | | Pittsfield, MA 38340 | | Central | metro county (urban) | recreation | https://maps.google.com/?q=BerkshireCounty+MA |
| | | Bristol County | MA | 25005 | | Providence-Warwick, RI-MA 39300 | Boston-Worcester-Providence,
MA-RI-NH-CT 148 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=BristolCounty+MA |
| | | Dukes County | MA | 25007 | | Vineyard Haven, MA 47240 | | Central | nonmetro county (rural) | recreation | https://maps.google.com/?q=DukesCounty+MA |
| | | Essex County | MA | 25009 | Cambridge-Newton-Framingham,
MA 15764 | Boston-Cambridge-Newton,
MA-NH 14460 | Boston-Worcester-Providence,
MA-RI-NH-CT 148 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=EssexCounty+MA |
| | | Franklin County | MA | 25011 | | Greenfield Town, MA 24640 | Springfield-Greenfield
Town, MA 521 | Central | nonmetro county (rural) | nonspecialized | https://maps.google.com/?q=FranklinCounty+MA |
| | | Hampden County | MA | 25013 | | Springfield, MA 44140 | Springfield-Greenfield
Town, MA 521 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=HampdenCounty+MA |
| | | Hampshire County | MA | 25015 | | Springfield, MA 44140 | Springfield-Greenfield
Town, MA 521 | Central | metro county (urban) | federal/state
government-dependent | https://maps.google.com/?q=HampshireCounty+MA |
| | | Middlesex County | MA | 25017 | Cambridge-Newton-Framingham,
MA 15764 | Boston-Cambridge-Newton,
MA-NH 14460 | Boston-Worcester-Providence,
MA-RI-NH-CT 148 | Central | metro county (urban) | nonspecialized | https://maps.google.com/?q=MiddlesexCounty+MA |
| | | Nantucket County | MA | 25019 | | | | Non-metropolitan | nonmetro county (rural) | recreation | https://maps.google.com/?q=NantucketCounty+MA |
