Counties in Massachusetts
Each county page says how cases move there under Massachusetts's rules, and lists the police agencies that serve it.
14 counties, largest first
- Middlesex County1,669,979 people · 70 agencies
- Worcester County888,502 people · 72 agencies
- Essex County826,653 people · 43 agencies
- Suffolk County791,891 people · 25 agencies
- Norfolk County739,749 people · 36 agencies
- Bristol County593,640 people · 27 agencies
- Plymouth County546,829 people · 32 agencies
- Hampden County464,338 people · 30 agencies
- Barnstable County233,539 people · 18 agencies
- Hampshire County164,065 people · 25 agencies
- Berkshire County128,224 people · 27 agencies
- Franklin County70,698 people · 27 agencies
- Dukes County21,219 people · 8 agencies
- Nantucket County14,758 people · 3 agencies
Population: Census Bureau county population estimates, Vintage 2025 (cc-est2025-alldata), July 1, 2025.