List of law enforcement agencies in Long Island

The List of Long Island law enforcement agencies provides an inclusive list of law enforcement agencies serving New York's Long Island. This includes those agencies serving the New York City boroughs of Brooklyn and Queens on the western portion of Long Island along with those serving the suburban counties of Nassau County and Suffolk County.

State agencies operating on Long Island

• Metropolitan Transportation Authority Police (police officers)

• New York State Court Officers (peace officers)
• New York State Department of Environmental Conservation Police (police officers)
• New York State Forest Rangers (police officers)
• New York State Office of Mental Health Police (peace officers)
• New York State Park Police (police officers)
• New York State Police (police officers)
• Port Authority of New York and New Jersey Police Department (police officers)
• State University of New York Police (police officers)
• New York State DMV Division of Field Investigations (peace officers)

New York City

• New York City Police Department
• New York City Fire Marshals (police officers)
• New York City Sheriff's Office (peace officers)
• New York City Department of Environmental Protection Police (police officers)
• New York City Department of Sanitation Police (peace officers)
• New York City Department of Health and Hospitals Police (peace officers)
• New York City Parks Enforcement Patrol (peace officers)
• New York City Taxi and Limousine Commission Inspectors (peace officers)
• New York City Department of Investigation (peace officers)
• New York City Department of City Administrative Services Police (peace officers)
• New York City Department of Correction (peace officers)
• New York City Department of Human Resources Administration Police (peace officers)
• New York City Department of Homeless Services Police (peace officers)
• New York State Roosevelt Island Authority; Roosevelt Island Department of Public Safety (New York State sanctioned public safety force for Roosevelt Island) (peace officers)
• City University of New York Public Safety Department (peace officers)
• Big Six Towers Public Safety (private safety force for the Big Six Towers housing community) (peace officers)
• Co-op City Department of Public Safety (private security force for Co-op City, a private housing community in The Bronx) (peace officers)
• Hunts Point Department of Public Safety (private safety force for Hunts Point) (peace officers)
• Triborough Bridge and Tunnel Authority (peace officers)
• Port Authority of New York and New Jersey Police Department (police officers)
• Metropolitan Transportation Authority Police (police officers)
• New York Society for the Prevention of Cruelty to Children Law Enforcement officers (peace officers)
• New York City Administration of Childrens Services (peace officers)

The New York City Transit Police and the New York City Housing Authority Police were merged into the NYPD in 1995, the Brooklyn Police Department and the Long Island City Police Department in 1898 and the Town of Morrisania Police Department in 1879.

Each of the five counties of New York City — New York (Manhattan), Bronx, Richmond (Staten Island), Kings (Brooklyn) and Queens — had a county sheriff's office. In 1942 they were merged to form the New York City Sheriff's Office. In 1939, the corrections part of the each county sheriff's office separated and became the consolidated New York City Department of Correction.

Nassau County

File:NCPD EMS.jpg

A Nassau County Police Department ambulance

• Nassau County Police Department
• Nassau County Sheriff's Department (Deputy Sheriffs are police officers. Correction Officers are peace officers)
• Nassau County Fire Marshals (peace officers)
• Nassau County SPCA (Peace Officers)
• East Hills Department of Public Safety (peace officers)
• Floral Park Police Department
• Freeport Police Department
• Garden City Police Department
• Glen Cove Police Department
• Great Neck Estates Police Department
• Hempstead Village Police Department
• Kings Point Police Department
• Lake Success Police Department
• Long Beach Police Department
• Lynbrook Police Department
• Malverne Police Department
• Muttontown Police Department
• Old Westbury Police Department
• Old Brookville Police Department
• Port Washington Police Department
• Oyster Bay Cove Police Department
• Rockville Centre Police Department
• Sands Point Police Department
• Town of Hempstead Bay Constables (peace officers)
• Town of Hempstead Department of Public Safety (Peace Officer)
• Town of North Hempstead Bay Constables (peace officers)
• Town of North Hempstead Department of Public Safety (peace officers)
• Town of Oyster Bay Bay Constables (peace officers)
• Village of Island Park Code Enforcement (New York) (peace officers)

Suffolk County

A Suffolk County Police boat

• Suffolk County Police Department
• Suffolk County Sheriff's Office (Deputy Sheriffs are police officers. Correction Officers are peace officers)

• Suffolk County SPCA Law Enforcement Division (peace officers)

• Asharoken Police Department
• Amityville Police Department
• Babylon Village Code Enforcement (peace officers)
• Belle Terre Village Constables (peace officers)
• Brightwaters Village Public Safety (peace officers)
• East Hampton Town Marine Patrol
• East Hampton Town Police Department
• East Hampton Village Police Department
• Fisher's Island Constables (peace officers)
• Head of the Harbor Police Department
• Lloyd Harbor Police Department
• Long Island MacArthur Airport Police Department (peace officers)
• Nissequogue Police Department
• Northport Police Department
• Ocean Beach Police Department
• Old Field Village Constables (peace officers)
• Port Jefferson Village Constables Bureau (peace officers)
• Poquott Village Constables (peace officers)
• Patchogue Village Constables (peace officers)
• Quogue Police Department
• Riverhead Town Police Department
• Sag Harbor Police Department
• Saltaire Police Department
• Shelter Island Town Police Department
• Southampton Town Bay Constables
• Southampton Town Police Department
• Southampton Village Police Department
• Southold Town Police Department
• Town of Babylon Bay Constable's Office (peace officers)
• Town of Babylon Park Rangers (peace officers)
• Town of Brookhaven Fire Marshals (peace officers)
• Town of Brookhaven Park Rangers (peace officers)
• Town of Brookhaven Harbormaster/Bay Constables (peace officers)
• Town of Islip Fire Marshal's Office (peace officers)
• Town of Islip Harbor Police Department (peace officers)
• Town of Islip Park Rangers (peace officers)
• Town of Huntington Harbormaster/Bay Constables(peace officers)
• Town of Smithtown Department of Public Safety (peace officers)
• Village of the Branch Police Department
• Westhampton Beach Police Department
• Westhampton Dunes Village Constables (peace officers)

Other

• Long Island Society for the Prevention of Cruelty to Children Law Enforcement (peace officers)

Federal

• Smithsonian Police
• Bureau of Alcohol, Tobacco, Firearms and Explosives
• Drug Enforcement Administration
• Federal Bureau of Investigation
• Immigration and Customs Enforcement
• US Federal Protective Service
• US Marshals Service
• US National Park Service (Law Enforcement Rangers)
• US Park Police
• US Postal Inspection Service
• US Postal Police
• US Probation and Parole Department
• US Secret Service
• US Veterans Affairs Police Department (at the Brooklyn NY VA Hospital, St. Albans Community Living Center and Northport VA Hospital)
• Customs and Border Protection-CBP (JFK Airport, LaGuardia Airport, )
• US Coast Guard
• Officers of the Federal Bureau of Prisons

Defunct

State agencies

• Long Island Rail Road Police (merged into Metropolitan Transportation Authority Police in 1997)
• Long Island State Parkway Police (merged into New York State Police and New York State Park Police in 1980)

New York City agencies

• New York City Transit Police (merged into the NYPD in 1995)
• New York City Housing Authority Police (merged into the NYPD in 1995)

Suffolk County agencies

• Babylon Town Police Department (merged into Suffolk County Police Department in 1960)
• Babylon Village Police Department (merged into Suffolk County Police Department in 1960)
• Lindenhurst Police Department (merged into Suffolk County Police Department in 1960)
• Brookhaven Town Police Department (merged into Suffolk County Police Department in 1960)
• Patchogue Village Police Department (merged into Suffolk County Police Department in 1960)
• Islip Town Police Department (merged into Suffolk County Police Department in 1960)
• Brightwaters Police Department (merged into Suffolk County Police Department in 1960)
• Huntington Town Police Department (merged into Suffolk County Police Department in 1960)
• Smithtown Town Police Department (merged into Suffolk County Police Department in 1960)
• Suffolk County Park Rangers (merged into Suffolk County Park Police in 1991)
• Greenport Police Department (merged into Southold Town Police Department in 1994)
• Hampton Bays Police Department (merged into Southampton Town Police Department in 19??)
• Suffolk County Park Police (merged to SCPD in 2014)