County police are the police of a county in the United States. Sweden as well as England, Wales, and Scotland, in the UK, now have a single, and only region wide police force Police Scotland. As well Northern Ireland has a regional, and only, police force the Police Service of Northern Ireland.
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.
In England, the police are divided into regional forces based on counties (sometimes amalgamations of two or three counties), which all provide full services throughout their districts.
Police forces in Scotland and Wales also used to be organised on a county basis, but then were amalgamated into a number of larger regional forces: eight in Scotland and four in Wales. In 2013, Scotland ditched it's eight regional forces and created one national police force known as Police Scotland.
Northern Ireland is historically policed on a national basis, first by the Royal Irish Constabulary, then the Royal Ulster Constabulary, which was reformed in 2001 as the Police Service of Northern Ireland. Northern Ireland has never been policed on a county basis.