Massachusetts counties
Every county in Massachusetts, with the ZIP codes recorded in each. Pick one to see its full ZIP code list.
- counties
- 14
- ZIP codes
- 685
All Massachusetts counties
| County | ZIP codes | Largest city |
|---|---|---|
| Barnstable County | 55 | Buzzards Bay |
| Berkshire County | 38 | Pittsfield |
| Bristol County | 44 | New Bedford |
| Dukes County | 7 | Chilmark |
| Essex County | 57 | Lynn |
| Franklin County | 30 | Greenfield |
| Hampden County | 53 | Springfield |
| Hampshire County | 29 | Amherst |
| Middlesex County | 111 | Cambridge |
| Nantucket County | 3 | Nantucket |
| Norfolk County | 45 | Quincy |
| Plymouth County | 61 | Brockton |
| Suffolk County | 53 | Boston |
| Worcester County | 99 | Worcester |
Scope every county-equivalent recorded in Massachusetts. Source Census 2024 county Gazetteer (2024 Gazetteer) and GeoNames US postal codes (2026-07 postal dump). Updated . Names and boundaries follow the Census Bureau's current county-equivalent set, not the MA postal source's older names.