List of law enforcement agencies in Massachusetts

This is a list of law enforcement agencies in the Commonwealth of Massachusetts.

According to the US Bureau of Justice Statistics' 2018 Census of State and Local Law Enforcement Agencies (CSLLEA),[1] the state had 374 law enforcement agencies employing 19,578 (sworn) personnel (27,489 personnel, total, including sworn and non-sworn positions), with an average of 284 sworn personnel per 100,000 residents (compared to the national average of 241 sworn personnel per 100,000 residents, with Massachusetts maintaining approximately 16% more sworn personnel per 100,000 residents than the national average).

[2] Between the previous CSLLEA (in 2008) and the 2018 CSLLEA, Massachusetts saw an increase of 357 law enforcement agencies to 374 (an increase of 17 agencies or 4.6%).

Sworn personnel would increase from 280 per 100,000 state residents to 284 per 100,000 residents (an increase of 4 per 100,000 or 1.4%).

[5] These are federal agencies that have common operations within the state.