Croatian language
Standard Croatian is the official language of the Republic of Croatia and, along with Standard Bosnian and Standard Serbian, one of three official languages of Bosnia and Herzegovina. It is also official in the regions of Burgenland (Austria), Molise (Italy) and Vojvodina (Serbia). Additionally, it has co-official status alongside Romanian in the communes of Carașova and Lupac, Romania. In these localities, Croats or Krashovani make up the majority of the population, and education, signage and access to public administration and the justice system are provided in Croatian, alongside Romanian.
Croats of Slovenia
It seems however that the great majority of Croats living in Slovenia uses Slovene as their primary language of communication.
In 2001, only around 2,700 people spoke either Croatian or a combination of Croatian and Slovene at home, which is a significant decrease from in 1991, when their number was around 10,000.