In Croatia, Kostur families are mainly Croats (from Samobor ), equally Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Vrlika area and in Samobor.
Prevalence
About 10 people with faimily name Kostur live in Croatia today, in 7 households. There were 100 of them in the middle of the past century, and their number decreased significantly. They are located in threee Croatian counties, two cities and another small place , mostly in Civljane in Vrlika area (<5), Zagreb (<5), and in Samobor (<5).