Oslaković families are Croats and they are mostly from Samobor. In the past century, relatively most of Croatian residents bearing this family name were born in Samobor and Zagreb. In places Manja Vas and Cerje Samoborsko in Samobor every sixth inhabitant had the family name Oslaković.
Prevalence
About 150 people with faimily name Oslaković live in Croatia today, in 60 households. There were 70 of them in the middle of the past century, and their number doubled. They are located in four Croatian counties, in 8 cities and 15 other places, mostly in Zagreb (35), Samobor (30), Cerje (20), Gornja Reka (15), and in Manja Vas (10).
Outside Croatia
Family name Oslaković is present in four countries on three continents. The family name "Oslakovic " is used by small number of people in the United States and small number in Australia.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.