In Croatia, Mladjen families are Serbs by relative majority (from Knin area ), rarely Croats (from Orahovica area ), and . In the past century, relatively most of Croatian residents bearing this family name were born in Knin area and in Ilok area.
Prevalence
Only a few people with faimily name Mladjen live in Croatia today, in four households only. There were 0 of them in the middle of the past century, and their number remains constant. They are located in only four naselja i to in Lovas in Ilok area (<5), Mirkovci (<5), Kutjevo in Orahovica area (<5), and in Ervenik in Knin area (<5).
Outside Croatia
Family name Mladjen is present in 8 countries on three continents. The family name "Mladjen " is used by small number of people in Germany , small number in the United States , and small number of people in Canada.