Filko families are predominantly Croats and they are mostly from Zabok area , less frequently Slovaks (from Ilok a). In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and in Zabok area. In Požarkovec in Zabok area every sixth inhabitant had the family name Filko.
About 170 people with faimily name Filko live in Croatia today, in 70 households. There were 140 of them in the middle of the past century, and their number increased by 20 percent. They are located in 8 Croatian counties, in 10 cities and 18 other places, mostly in Zagreb (45), Ilok (20), Zapresic (10), Police (10), and in Djakovo (10).