In Croatia, Kozbašić families are almost entirely Croats (from Slavonski Brod area ), very rarely Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Backa, Vojvodina and in Slavonski Brod.
Prevalence
About 40 people with faimily name Kozbašić live in Croatia today, in 16 households. There were 20 of them in the middle of the past century, and their number doubled. They are located in 6 Croatian counties, in 7 cities and threee other places, mostly in Kupina in Slavonski Brod area (10), Zagreb (<10), Osijek (<10), Pakrac (<10), and in Aljmas in Vinkovci area (<10).
Outside Croatia
Family name Kozbašić is present in this form only in Croatia.