This is a list of U.S. state and local law enforcement agencies - local, regional, special and statewide government agencies (state police) of the U.S. states, of the federal district, and of the territories that provide law enforcement duties, including investigations, prevention and patrol functions. In addition, the Attorney General's office of each state may have their own investigators.
The Bureau of Justice Statistics conducted a census of state and local law enforcement agencies every four years 1992-2008.