Massachusetts State Prison Inmate Locator 
Click Here
Massachusetts County Jail Rosters
If marked NA then none are available then link will go to Sheriff or Jail
Barnstable (NA) Berkshire (NA) Bristol (NA) Dukes (NA)
Essex (NA) Franklin (NA) Hampden (NA) Hampshire (NA)
Middlesex (NA) Nantucket (NA) Norfolk (NA) Plymouth (NA)
Suffolk (NA) Worcester    

Federal Inmate Locator
Click Here
You can identify a federal inmate as they will always have five numbers, dash then three numbers 00000-000.

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