Zrnić families are mainly Croats and they are mostly from middle Bosnia , often Serbs, and very rarely Bosniaks. In the past century, relatively most of Croatian residents bearing this family name were born in Ogulin and in Middle Bosnia (Zenica area). In Kozarci in Middle Bosnia every second inhabitant had the family name Zrnić.
About 520 people with faimily name Zrnić live in Croatia today, in 240 households. There were 450 of them in the middle of the past century, and their number increased by 20 percent. They are located in almost all Croatian counties, in 43 cities and 49 other places, mostly in Zagreb (155), Rijeka (45), Dreznica (30), Sisak (25), and in Virovitica (20).