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from Wikipedia

Federal Government

1. United States Park Police
2. National Park Service Ranger (Law Enforcement)
3. FBI Police
4. Department of Defense Police
5. United States Marshals Service
6. United States Secret Service
7. Diplomatic Security Service
8. Federal Bureau of Investigation
9. Amtrak Police
10. United States Postal Inspection Service
11. United States Postal Police
12. Drug Enforcement Administration
13. Alcohol, Tobacco, Firearms and Explosives
14. Federal Air Marshal Service
15. U.S. Customs and Border Protection
16. Immigration and Customs Enforcement
17. Diplomatic Security Service
18. United States Federal Protective Service
19. US Fish and Wildlife Service
20. IRS Criminal Investigation Division
21. Veterans Affairs Police
22. Federal Reserve Police
23. U.S. Army Criminal Investigation Command
24. Naval Criminal Investigative Service

State Government

1. New York State Department of Corrections and Community Supervision
2. New York State Department of Environmental Conservation Police
3. New York State Division of Alcoholic Beverage Control
4. New York State Division of Probation and Correctional Alternatives
5. New York State Division of State Police
6. New York State DMV Division of Field Investigations
7. New York State Bridge Authority Police
8. New York State Court Officers
9. New York State Forest Rangers
10. New York State Office of Mental Health Police
11. New York State Office of Mental Retardation and Developmental Disabilities Police
12. New York State Office of Tax Enforcement
13. New York State Park Police
14. New York State Special Commission of Investigation
15. Metropolitan Transportation Authority Police
16. Port Authority of New York and New Jersey Police Department
17. New York State University Police
18. Triborough Bridge and Tunnel Authority Police
19. Waterfront Commission of New York Harbor Police
20. Roosevelt Island Department of Public Safety

City Government Agencies

1. New York City Police Department
2. New York City Sheriff's Office
3. New York City Department of Environmental Protection Police
4. New York City Department of Investigation
5. New York City Taxi and Limousine Commission Enforcement
6. New York City Department of Health and Hospitals Police
7. New York City Human Resources Administration Police Department
8. New York City Department of Homeless Services Police
9. New York City Department of Sanitation Police
10. New York City Parks Enforcement Patrol
11. City University of New York Public Safety Department
12. New York City Fire Department Fire Marshals
13. New York City Department of Correction
14. New York City Department of Probation
15. New York City Administration for Children Services Police
16. New York City Marshals

Private Police Agencies

1. Co-op City Department of Public Safety
2. Hunts Point Department of Public Safety
3. New York Racing Association Law Enforcement and Safety Division
4. Spring Creek Towers Department of Public Safety (Starrett City)
5. Snug Harbor Park Rangers
6. Sea Gate Police Department