West Mercia Police was created in 1967.
West Yorkshire Police was created in 1974.
North West Mounted Police - film - was created on 1940-10-22.
Godiva Countess of Mercia
According to the website of the Royal Canadian Mounted Police (RCMP), its predecessor, the North West Mounted Police (NWMP) was created primarily: "to stop liquor trafficking in the North-west; to gain the respect and confidence of the natives; to collect customs dues; and to perform all the duties of a police force."
America
West Mercia Police covers the counties of Shropshire, Herefordshire and Worcestershire in England. West Mercia Police are responsible for policing an area of 7,430 square kilometers.
Mercia was created in 527.
West Yorkshire Police was created in 1974.
West Midlands Police was created in 1974.
West Virginia State Police was created in 1919.
Metropolitan Police Service was created in 1829.
West Virginia State Police Academy was created in 1953.
North West Motorway Police Group was created in 2008.
North-West Mounted Police was created in 1873.
North West Mounted Police - film - was created on 1940-10-22.
According to Wikipedia, the West Yorkshire Police was created in 1974 and currently employs 5,671 officers plus civilian staff.
Mercia ended in 918.