In Croatia, Koroš families are Croats (from Cetinje, Montenegro ). In the past century, relatively most of Croatian residents bearing this family name were born in Bjelovar and Cakovec.
Prevalence
About 20 people with faimily name Koroš live in Croatia today, in 12 households. There were 60 of them in the middle of the past century, and their number decreased significantly. They are only located in four Croatian cities and four other places, mostly in Cakovec (<10), Bjelovar (<5), Pribislavec (<5), Glina (<5), and in Selci Djakovacki (<5).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1917 in source List of Dignitaries, Officials and Public Servants of the Kingdom of Croatia-Slavonia.