 Numbers 200 00 - 249 99 are reserved for internal needs of the postal system itself and are not assigned to any region.The Prague central distribution post office uses 225 00.3 - western and southern Bohemia (301 00 - 326 00 Plzeň, 360 01 Karlovy Vary, 370 01 České Budějovice)
4 - northern Bohemia (400 01 Ústí nad Labem, 460 01 Liberec)
5 - eastern Bohemia and western Moravia (500 01 Hradec Králové, 530 01 Pardubice, 541 01 Trutnov, 586 01 Jihlava)
6 - southern Moravia (600 00 - 659 99 Brno, 690 01 Břeclav)
7 - eastern and northern Moravia (779 00 Olomouc, 760 01 Zlín, 700 01 - 729 99 Ostrava)
8,9,0 are assigned to Slovakia.