The FBI's Uniform Crime Reporting program lists 68 law enforcement agencies in Middlesex County, Massachusetts: 54 city or town police departments, 1 state police post, 12 campus police departments and 1 other agency.
City and Town Police Departments in Middlesex County
- Acton Police DepartmentCity or town police · ORI MA0090100 · NIBRS since 1996
- Arlington Police DepartmentCity or town police · ORI MA0090200 · NIBRS since 2002
- Ashby Police DepartmentCity or town police · ORI MA0090300 · NIBRS since 2004
- Ashland Police DepartmentCity or town police · ORI MA0090400 · NIBRS since 1995
- Ayer Police DepartmentCity or town police · ORI MA0090500 · NIBRS since 1995
- Bedford Police DepartmentCity or town police · ORI MA0090600 · NIBRS since 1995
- Belmont Police DepartmentCity or town police · ORI MA0090700 · NIBRS since 2002
- Billerica Police DepartmentCity or town police · ORI MA0090800 · NIBRS since 1999
- Boxborough Police DepartmentCity or town police · ORI MA0090900 · NIBRS since 2002
- Burlington Police DepartmentCity or town police · ORI MA0091000 · NIBRS since 2003
- Cambridge Police DepartmentCity or town police · ORI MA0091100 · NIBRS since 2007
- Carlisle Police DepartmentCity or town police · ORI MA0091200 · NIBRS since 2000
- Chelmsford Police DepartmentCity or town police · ORI MA0091300 · NIBRS since 2000
- Concord Police DepartmentCity or town police · ORI MA0091400 · NIBRS since 1997
- Dracut Police DepartmentCity or town police · ORI MA0091500 · NIBRS since 2001
- Dunstable Police DepartmentCity or town police · ORI MA0091600 · NIBRS since 2012
- Everett Police DepartmentCity or town police · ORI MA0091700 · NIBRS since 2000
- Framingham Police DepartmentCity or town police · ORI MA0091800 · NIBRS since 2011
- Groton Police DepartmentCity or town police · ORI MA0091900 · NIBRS since 1999
- Holliston Police DepartmentCity or town police · ORI MA0092000 · NIBRS since 1995
- Hopkinton Police DepartmentCity or town police · ORI MA0092100 · NIBRS since 1995
- Hudson Police DepartmentCity or town police · ORI MA0092200 · NIBRS since 1995
- Lexington Police DepartmentCity or town police · ORI MA0092300 · NIBRS since 1996
- Lincoln Police DepartmentCity or town police · ORI MA0092400 · NIBRS since 2002
- Littleton Police DepartmentCity or town police · ORI MA0092500 · NIBRS since 1995
- Lowell Police DepartmentCity or town police · ORI MA0092600 · NIBRS since 2007
- Malden Police DepartmentCity or town police · ORI MA0092700 · NIBRS since 2004
- Marlborough Police DepartmentCity or town police · ORI MA0092800 · NIBRS since 1995
- Maynard Police DepartmentCity or town police · ORI MA0092900 · NIBRS since 1997
- Medford Police DepartmentCity or town police · ORI MA0093000 · NIBRS since 2013
- Melrose Police DepartmentCity or town police · ORI MA0093100 · NIBRS since 2002
- Natick Police DepartmentCity or town police · ORI MA0093200 · NIBRS since 2004
- Newton Police DepartmentCity or town police · ORI MA0093300 · NIBRS since 2004
- North Reading Police DepartmentCity or town police · ORI MA0093400 · NIBRS since 1997
- Pepperell Police DepartmentCity or town police · ORI MA0093500 · NIBRS since 2003
- Reading Police DepartmentCity or town police · ORI MA0093600 · NIBRS since 2000
- Sherborn Police DepartmentCity or town police · ORI MA0093700 · NIBRS since 2003
- Shirley Police DepartmentCity or town police · ORI MA0093800 · NIBRS since 1995
- Somerville Police DepartmentCity or town police · ORI MA0093900 · NIBRS since 2005
- Stoneham Police DepartmentCity or town police · ORI MA0094000 · NIBRS since 2007
- Stow Police DepartmentCity or town police · ORI MA0094100 · NIBRS since 1995
- Sudbury Police DepartmentCity or town police · ORI MA0094200 · NIBRS since 1995
- Tewksbury Police DepartmentCity or town police · ORI MA0094300 · NIBRS since 1995
- Townsend Police DepartmentCity or town police · ORI MA0094400 · NIBRS since 1999
- Tyngsboro Police DepartmentCity or town police · ORI MA0094500 · NIBRS since 1995
- Wakefield Police DepartmentCity or town police · ORI MA0094600 · NIBRS since 1999
- Waltham Police DepartmentCity or town police · ORI MA0094700 · NIBRS since 2002
- Watertown Police DepartmentCity or town police · ORI MA0094800 · NIBRS since 2003
- Wayland Police DepartmentCity or town police · ORI MA0094900 · NIBRS since 1998
- Westford Police DepartmentCity or town police · ORI MA0095000 · NIBRS since 1995
- Weston Police DepartmentCity or town police · ORI MA0095100 · NIBRS since 1997
- Wilmington Police DepartmentCity or town police · ORI MA0095200 · NIBRS since 2008
- Winchester Police DepartmentCity or town police · ORI MA0095300 · NIBRS since 1997
- Woburn Police DepartmentCity or town police · ORI MA0095400 · NIBRS since 1996
State Police in Middlesex County
- State Police: Middlesex CountyState police · ORI MA309SP00 · NIBRS since 2021
State Agencies in Middlesex County
- Massachusetts Bay Transportation Authority: Middlesex CountyState agency · ORI MA009BA00 · NIBRS since 2025
College and University Police in Middlesex County
- Bentley UniversityCollege or university police · ORI MA009589E · NIBRS since 2017
- Boston CollegeCollege or university police · ORI MA009619E · NIBRS since 2018
- Brandeis UniversityCollege or university police · ORI MA009579E · NIBRS since 2023
- Framingham State UniversityCollege or university police · ORI MA0095900 · NIBRS since 2021
- Harvard University College or university police · ORI MA009629E · NIBRS since 2019
- Lasell CollegeCollege or university police · ORI MA009679E · NIBRS since 2019
- Massachusetts Institute of TechnologyCollege or university police · ORI MA009639E · NIBRS since 2005
- Regis CollegeCollege or university police · ORI MA009019E · NIBRS since 2024
- Tufts University: MedfordCollege or university police · ORI MA009649E · NIBRS since 2010
- Tufts University: SuffolkCollege or university police · ORI MA013390X · NIBRS since 2010
- Tufts University: WorcesterCollege or university police · ORI MA014640X · NIBRS since 2010
- University of Massachusetts: LowellCollege or university police · ORI MA0096000 · NIBRS since 2021
Where People Arrested in Middlesex County Are Held
In most U.S. counties, adults arrested by city police, the sheriff or state troopers are booked into the county jail first. Some larger cities run their own holding jail, so if a person is not on the county roster, call the arresting department.
Law Enforcement in Other Massachusetts Counties
Agency names, types and ORI codes come from the FBI Crime Data Explorer agency list, retrieved November 2026. NIBRS dates show when an agency began reporting incident-level crime data to the FBI.