Mlađan families are mainly Croats and they are mostly from Nova Gradiska , often Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Duga Resa area and in Zagreb. In Bukovica Utinjska in Duga Resa area every fifth inhabitant had the family name Mlađan.
Prevalence
About 110 people with faimily name Mlađan live in Croatia today, in 50 households. There were 180 of them in the middle of the past century, and their number decreased by 40 percent. They are located in the most of Croatian counties, in 15 cities and 20 other places, mostly in Bukovica Utinjska in Duga Resa area (20), Zagreb (15), Sesvete (10), Rakovica in Slunj area (<10), and in Veljun (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.