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.
Republic of Ragusa
According to Graubard:
Croatian was normally spoken among lower classes, Italian among the upper. Ragusans were in general bilingual, speaking Croatian in common day-to-day duties and Italian in official occasions or mixing both. Literary works of famous Ragusans were written in both Croatian and Italian. Among them are the works of writers Džore Držić, Marin Držić, Ivan Bunić Vučić, Ignjat Đurđević, Ivan Gundulić, Šišmundo (Šiško) Menčetić, and Dinko Ranjina.