In Croatia, Bartošak families are generally Croats (from Pozega ), very rarely Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Pozega.
Prevalence
About 20 people with faimily name Bartošak live in Croatia today, in 8 households. There were 10 of them in the middle of the past century, and their number doubled. They are located in two Croatian cities only, in Pozega (15) and Zagreb (<5).