Three of the following defunct Commonwealth of Massachusetts police agencies (Registry of Motor Vehicles Division of Law Enforcement, Massachusetts Capitol Police, Metropolitan District Commission Police) were merged in 1992 by Chapter 412 of the Massachusetts Acts of 1991 along with the former Department of Public Safety - Division of State Police to form the current Department of State Police. All officers of the three departments became Massachusetts State Troopers at the time of the merger without needing to attend the Massachusetts State Police Academy.
The Boston Municipal Police were founded in 1979 and had full city-wide police powers in the City of Boston as Special Police Officers. However, the officers of the department were primarily tasked with patrol of city buildings and public property as well as responding to security alarms. The department was dissolved on January 1, 2007 and replaced by the Boston Municipal Protective Services, an unarmed security force. Officers of the Municipal Protective Services still hold arrest powers as Special Police Officers but the vast majority of law enforcement activity previously handled by the Boston Municipal Police is now the responsibility of the Boston Police Department.
Department of Public Safety - Division of State Police
This is the former statewide police department for the Commonwealth of Massachusetts, which was founded in 1865; the M.D.C. Police, Registry of Motor Vehicles Police, and Capitol Police merged with this department to form the new Department of State Police in 1992. Prior to being known as the Massachusetts State Police, the department was known as the Special District Police of Massachusetts from 1879 to 1919.
Registry of Motor Vehicles Division of Law Enforcement
Massachusetts State Registry of Motor Vehicles Police patch
The Registry Police had the primary function of enforcing motor vehicle safety laws statewide, drivers license testing, crash investigation, enforcing laws & regulations on Registry property, and commercial vehicle inspection, although that had full police powers statewide.
Inspectors of the Registry Police were unique in the fact that as Registry employees they were able to suspend an operator's license on the roadside.
The Registry Police Statewide HQ was located at 100 Nashua St., Boston.
Massachusetts Capitol Police
Massachusetts Capitol Police patch
The Capitol Police had the primary function of law enforcement on the grounds and adjacent streets of the State Capitol and all state property. The Capitol police provided vehicle cruiser, motorcycle and traffic patrols, criminal investigations and executive protection services. The Capitol Police station was at 1 Ashburton Place in Government Center and became MSP Barracks H-1.
Metropolitan District Commission Police
Massachusetts Metropolitan Police patch
The Metropolitan District Commission's Police Department; the Massachusetts Metro Police was created in 1893. The Metropolitan Police had the primary jurisdiction of law enforcement on all MDC controlled properties, roadways and all Massachusetts Water Resources Authority (MWRA) facilities, Reservoirs and Watersheds. Additionally, the MDC Police had patrol jurisdiction on US Route 1 in Chelsea and Revere, Interstate 93 in Boston and Milton (Central Artery and the Southeast Expressway). MDC Police also had full jurisdiction in cities and towns wherever there were MDC facilities or property.
MDC Police were the third largest police agency in New England with over six hundred officers working primarily throughout Metropolitan Boston. They were commonly referred to as The Mets. In addition to patrol functions The Mets provided tactical assistance to area cities and towns in the form of regional SWAT teams, the Marine Unit and tactical operations units. Examples include Tactical Officers assigned to the city of Boston during court ordered school desegregation, assignment as the primary security agency for the Department of State with the responsibility of providing security and escorts for visiting dignitaries and annual assignments to assist cities and towns during the Boston Marathon.
A car driver pulled over by two Metropolitan District Commission policemen for having run a red light in Cambridge, 1990.
MDC Police also maintained a full service detective unit to investigate crimes on its primary jurisdiction as well as providing Detectives and undercover agents to area cities and towns, area Drug Task Forces, the (state) Governor's Auto Theft Strike Force, the DEA Boston Drug Task Force, the Secret Service and the FBI.
The following current Massachusetts State Police Barracks were MDC Police districts: MSP Barracks A4 − Medford (Middlesex Fells District); MSP Barracks A5 − Revere (Revere Beach); MSP Barracks H4 − Boston, next to Museum of Science (Lower Basin District); MSP Barracks H5 − Brighton on Soldiers Field Rd (Upper Basin District); MSP Barracks H6 − South Boston (Old Colony District); MSP H7 − Milton (Blue Hills District); MSP Barracks C7 − Belchertown (Quabbin District).
Additionally, the following State Police Units are based out of former MDC Police facilities:
MSP Marine Unit (New Charles River Dam, Boston); MSP Canine Unit (Pond St., Stoneham).
The following former MDC police stations were closed in the first few years after the consolidation: Wachusett District (Wachusett and Sudbury Reservoirs and Watersheds); Nantasket Beach District (Nantasket Beach, Hull); Nahant Beach Substation (Nahant Beach); Mounted Unit Stables (Stoneham and Milton).
The Massachusetts Parking Authority Police patrolled the Boston Common Garage, Charles Street and parts of the Boston common, from 1975 until the Parking Authority was disbanded and the garage turned over to the Massachusetts Convention Center Authority in 1982. The patrol force slowly diminished through retirement and officers leaving for other agencies.
Worcester Airport Police
The Worcester Airport Police patrolled the grounds Worcester Regional Airport. The department was unique in that in provided both law enforcement and firefighting services to the airport. Officers of the Worcester Airport Police were both certified as Massachusetts Special State Police Officers as well as firefighters. The Worcester Airport Police were disbanded in the 2000's. Police services at the airport are now covered by the Massachusetts State Police and the Massachusetts Port Authority Department of Public Safety. Firefighting services are covered by the Massachusetts Port Authority Fire Rescue.
Massachusetts Department of Mental Health Police/Department of Developmental Services Police
The Massachusetts Department of Mental Health Police (previously merged with the Department of Developmental Services & Department of Mental Retardation) patrolled properties operated by the Massachusetts Department of Mental Health such as the Worcester Recovery Center and Hospital, Massachusetts Mental Health Center (MMHC), Bridgewater State Hospital, and the Dr. Solomon Carter Mental Health Center. Despite the Massachusetts Police Reform Law exempting the agency from POST requirements, the state decided to disband the entire department.
Soldiers Home in Chelsea Police
Soldiers Home in Chelsea Police patrolled the Soldiers Home in Chelsea. The agency was disbanded in 2024 due to the Massachusetts Police Reform Law.
Transit police are specialized police agencies employed either by a common carrier, such as a transit district, railway, railroad, bus line, or another mass transit provider or municipality, county, district, or state.
Security police usually describes a law enforcement agency which focuses primarily on providing security and law enforcement services to particular areas or specific properties. They may be employed by governmental, public, or private institutions. Security police are generally considered distinct from security guards as security police personnel typically hold some level of law enforcement authority. The exact powers held by security police vary widely between jurisdictions. Examples of these types of agencies include the United States' DoD Police and FBI Police, the Indian Central Industrial Security Force, and the British Civil Nuclear Constabulary.
Special police usually describes a police force or unit within a such an agency whose duties and responsibilities are significantly different from other forces in the same country or from other personnel within the same agency, although there is no consistent international definition. Generally, special police personnel hold some level of police powers; sometimes they hold the same powers and authority of other law enforcement officers within their jurisdiction, but at a minimum they will typically possess detainment and arrest authority. 'Special police' is also occasionally used when referring to an 'elite' law enforcement agency or unit, such as special weapons and tactics (SWAT) units or other similar paramilitary forces whom posses some level of police power. 'Special police' may also be used to describe individuals who are granted police powers incidental to their primary duties, such as welfare fraud investigators, certain security guards, child welfare investigators, and agricultural inspectors. Special police personnel may be armed or unarmed.
State police, provincial police or regional police are a type of sub-national territorial police force found in nations organized as federations, typically in North America, South Asia, and Oceania. These forces typically have jurisdiction over the relevant sub-national jurisdiction, and may cooperate in law enforcement activities with municipal or national police where either exist.
The California State Police (CSP) was the state-level security police agency from 1887 to 1995 for the U.S. state of California. It merged with the California Highway Patrol in 1995.
The Metropolitan Police Department of the District of Columbia (MPDC), more commonly known locally as the Metropolitan Police Department (MPD), and, colloquially, DC Police, is the primary law enforcement agency for the District of Columbia, in the United States. With approximately 3,400 officers and 600 civilian staff, it is the sixth-largest municipal police department in the United States. The department serves an area of 68 square miles (180 km2) and a population of over 700,000 people. Established on August 6, 1861, the MPD is one of the oldest police departments in the United States. The MPD headquarters is at the Henry J. Daly Building, located on Indiana Avenue in Judiciary Square across the street from the District of Columbia Court of Appeals and the Superior Court of the District of Columbia. The department's mission is to "safeguard the District of Columbia and protect its residents and visitors with the highest regard for the sanctity of human life". The MPD's regulations are compiled in title 5, chapter 1 of the District of Columbia Code.
The Massachusetts State Police (MSP) is an agency of the Commonwealth of Massachusetts' Executive Office of Public Safety and Security, responsible for law enforcement and vehicle regulation across the state. As of 2024, it has 2,330 sworn troopers and 611 civilian support staff for a total of 2,941 personnel, making it the largest law enforcement agency in New England. The MSP is headed by Interim Colonel Jack Mawn.
Massachusetts Port Authority (Massport) is the port authority for the Commonwealth of Massachusetts. It owns and operates three airports, Logan International Airport, Hanscom Field, and Worcester Regional Airport, and public terminals in the Port of Boston.
The Las Vegas Metropolitan Police Department is a combined city and county law enforcement agency for the City of Las Vegas and Clark County, Nevada, United States. It is headed by the Sheriff of Clark County, who is publicly elected every four years. The sheriff is the only elected head law enforcement officer within the county, and, as such, the department is not under the direct control of its jurisdictional cities, Clark County, or the State of Nevada.
The Massachusetts Bay Transportation Authority Police is a police force which has primary jurisdiction on Massachusetts Bay Transportation Authority (MBTA) property and vehicles in each of the 177 cities and towns within the MBTA. The department has grown to an authorized strength of 266 officers and 10 civilians. The majority of the MBTA Police Department's efforts are focused on patrol in Boston and surrounding communities, particularly around heavy rail The department patrols and protects the 5 subway lines to include the Silver Line, 13 commuter rail lines, 4 passenger ferry routes, 181 bus routes and The Ride paratransit system in Massachusetts communities.
The Michigan State Police (MSP) is the state police agency for the U.S. state of Michigan. The MSP is a full-service law enforcement agency, with its sworn members having full police powers statewide.
The Port Authority of New York and New Jersey Police Department, or Port Authority Police Department (PAPD), is a law enforcement agency in New York and New Jersey, the duties of which are to protect and to enforce state and city laws at all the facilities, owned or operated by the Port Authority of New York and New Jersey (PANYNJ), the bi-state agency running airports, seaports, and many bridges and tunnels within the Port of New York and New Jersey. Additionally, the PAPD is responsible for other PANYNJ properties including three bus terminals, the World Trade Center in Lower Manhattan, and the PATH train system. The PAPD is the largest transit-related police force in the United States.
The Boston Municipal Protective Services Department (BMPS) is a former police agency that patrols properties owned and controlled by the City of Boston, the successor agency to the Boston Municipal Police (BMP). The primary responsibility of the agency is to enforce all laws of the Commonwealth of Massachusetts and ordinances of the City of Boston on and within all properties owned and operated by the City of Boston. It is an agency of Boston's Property & Construction Management Department.
The Massachusetts Department of Transportation (MassDOT) oversees roads, public transit, aeronautics, and transportation licensing and registration in the US state of Massachusetts. It was created on November 1, 2009, by the 186th Session of the Massachusetts General Court upon enactment of the 2009 Transportation Reform Act.
There are forty-five local police agencies in Westchester County, New York. As well as other agencies. They are responsible for protecting Westchester County, these agencies frequently work with one another in the surrounding counties. Current economic times has caused a few Westchester municipalities to consider consolidation of police services. The Westchester County Department of Public Safety started providing primary police services for the Town/Village of Mount Kisco in 2015.
Airport police units are a security police agency assigned to perform law enforcement functions at airports. They provide a wide range of law enforcement duties and responsibilities including patrol, investigation, traffic flow management, and control and response to airport emergencies. Airport police provide enhanced safety to airport employees, and to passengers. Officers can be found at security gates, throughout the terminal area, and around the airport’s perimeter.
In the United States, a sheriff is the chief of law enforcement of a county. Sheriffs are usually either elected by the populace or appointed by an elected body.
A private police force, or private police department, in the United States is a law enforcement agency that is:
Many municipalities of Massachusetts have their own police departments, as do many colleges and universities. Though most county governments have been abolished, each county still has a Sheriff's Department which operates jails and correctional facilities and service of process within the county.
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