Ćustić families are predominantly Croats and they are mostly from Zadar area , rarely Bosniaks. In the past century, relatively most of Croatian residents bearing this family name were born in Zadar and in Zadar area.
About 170 people with faimily name Ćustić live in Croatia today, in 80 households. There were 100 of them in the middle of the past century, and their number increased by 80 percent. They are located in the most of Croatian counties, in 16 cities and 10 other places, mostly in Zadar (60), Murvica in Zadar area (35), Zagreb (30), and in Brisevo (20) and Policnik (15) in Zadar area.