County police
County police are police forces existing primarily in the United States that possess primary jurisdiction over an entire county. England and Wales, two constituent countries of the United Kingdom (UK), are policed by territorial police forces which are largely formed on a county basis. Historically, Northern Ireland and Scotland, the other two constituent countries of the UK, have had county police, although both countries now have unified national police services. Sweden. Until the end of 2014, all of the 21 counties of Sweden had its own County Police Department. In 2015, Sweden merged all local police departments into  a single police agency, dividing the country into seven police regions instead. United Kingdom. In the United Kingdom, the police are made up of 45 territorial police forces and 3 special police forces. Territorial police forces. Territorial police forces that have a presence at a regional and county level throughout the UK include: Special police services. Special police services that have a presence at a national level throughout the UK include: United States. In the United States, the powers, duties, and even existence of county police forces vary widely depending on the state, and even on the particular county (parish  in Louisiana) within a state. County police forces as autonomous entities are relatively rare and tend to exist only in metropolitan counties. Many states also have a sheriff's office which are usually formed on a county basis and traditionally carry out duties related to the functioning of the courts and legal system, such as service of process, executing legal writs, and protection for the local courthouse and its judges. Many state constitutions mandate that the position of sheriff be created, which leads many states to also give sheriffs the duties of a county police to avoid having overlapping departments  with similar duties, leaving the sheriff as the exclusive law enforcement agency for a county. Some counties that previously had both a county police force and a sheriff's office have merged the two, leaving the sheriff in command of the unified force, as the sheriff derives his power directly from the constitution; the most prominent example of such a merger is the Las Vegas Metropolitan Police Department which is actually led by the county sheriff despite its name. County police tend to fall into three broad categories: Note: County detectives, who are maintained in the northeastern states by county  attorneys' offices, fall within this category. In the state of Louisiana, a county is known as a parish. In the state of Alaska, a county is known as a borough. The only borough in Alaska to have their own police department is North Slope Borough. U.S. departments. There are 3,141 counties in the United States and some of the following county police departments are: