Ostović families are Croats and they are mostly from Otocac. In the past century, relatively most of Croatian residents bearing this family name were born in Otocac and Zagreb. In Derolovi in Podrinje (Bosnia) nearly every inhabitant had the family name Ostović.
About 400 people with faimily name Ostović live in Croatia today, in 190 households. There were 350 of them in the middle of the past century, and their number increased by 20 percent. They are located in the most of Croatian counties, in 30 cities and 31 other places, mostly in Zagreb (75), Pula (60), Otocac (55), Osijek (20), and in Licko Lesce (20).