From Stamps of the World
Košice (German: Kaschau, Hungarian: Kassa) is the biggest city (239,464 inhabitants end 2014) in eastern Slovakia, seat of the Košice region. It is situated on the river Hornád at the eastern reaches of the Slovak Ore Mountains. Historically in the Kingdom of Hungary, province of Hungary, before the creation of Czechoslovakia in 1918.
Kingdom of Hungary period (1867-1918)
Austrian Empire period (until 1867)
The CASCHAU post-office opened before 1850.