In Croatia, Vlasac families are generally Croats (from Slavonski Brod ), very rarely Roms (from Zagreb ), and . In the past century, relatively most of Croatian residents bearing this family name were born in Slavonski Brod.
Prevalence
About 30 people with faimily name Vlasac live in Croatia today, in 14 households. There were 30 of them in the middle of the past century, and their number remains constant. They are located in only four naselja i to in Slavonski Brod (25), Zagreb (<10), Zadubravlje in Slavonski Brod area (<5), and in Brodski Varos (<5).