Mlađenović families are mainly Croats and they are mostly from Hrvatska Kostajnica area , often Serbs. In the past century, relatively most of Croatian residents bearing this family name were born in Hrvatska Kostajnica area and in Sisak. In Gornji Vrhovci in Pozega area every fourth inhabitant had the family name Mlađenović.
Prevalence
About 160 people with faimily name Mlađenović live in Croatia today, in 80 households. There were 310 of them in the middle of the past century, and their number halved. They are located in the most of Croatian counties, in 21 cities and 18 other places, mostly in Zagreb (35), Golubovac Divuski in Hrvatska Kostajnica area (30), Sisak (10), Petrinja (<10), and in Desni Dubrovcak in Sisak area (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned over twenty times, the first time 1749 in source 18th Century Census.