Following is a list of Regions in the Czech Republic along with their abbreviations.  The full name or abbreviation is accepted in the State_Province field in your CSV file when you upload.

Region Abbreviation Alternate Abbreviation
Prague PR 10
Central Bohemia ST 20
South Bohemia JC 31
Plzen PL 32
Karlovy Vary KA 41
Ústí nad Labem US 42
Liberec LI 51
Hradec Králové KR 52
Pardubice PA 53
Olomouc OL 71
Moravia-Silesia MO 80
South Moravia JM 62
Zlín ZL 72
Vysocina VY 61