Massachusetts Bay Constable Association
- Provides access to a process server directory for most cities, counties, and towns of the greater Massachusetts bay area.
- http://www.constables-mbca.org/

State Police Association of Massachusetts
- Links to Association officers, news and information from the troops.
- http://www.masstroopers.org

Massachusetts Law Enforcement Firearms Instructors' & Armorers' Association
- Promotes professionalism, continuing education and improvement in training methods and techniques in the proper use of law enforcement firearms.
- http://www.mlefiaa.org

Massachusetts Chiefs of Police Association
- News, events calendar, training and membership information.
- http://www.masschiefs.org/