In Croatia, Mareš families are mainly Croats (from Bjelovar area ), rarely Czechs (from Daruvar area ), and . In the past century, relatively most of Croatian residents bearing this family name were born in Daruvar area and in Zagreb.
Prevalence
About 60 people with faimily name Mareš live in Croatia today, in 30 households. There were 40 of them in the middle of the past century, and their number increased by 60 percent. They are located in 8 Croatian counties, in 8 cities and 10 other places, mostly in Koska in Nasice area (15), Novska (10), Severin in Bjelovar area (<10), Daruvar (<10), and in Dugo Selo (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1926 in source Emigration Commission Zagreb.