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

Province Abbreviation Alternate Abbreviation
Drenthe DR
Flevoland FL
Friesland FR
Gelderland GE
Groningen GR
Limburg LI
North Brabant NB
North Holland NH
Overijssel OV
Utrecht UT
Zeeland ZE
South Holland ZH