In Croatia, Kosturić families are generally Croats (from Karlovac ), very rarely Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Karlovac.
Prevalence
About 10 people with faimily name Kosturić live in Croatia today, in five households only. There were 10 of them in the middle of the past century, and their number remains constant. They are located in only threee naselja i to in Karlovac (10), Opatija (<5), and in Rosopajnik in Duga Resa area (<5).