Tumpak families are Croats and they are mostly from Sisak area. In the past century, relatively most of Croatian residents bearing this family name were born in Sisak area and in Sisak.
About 120 people with faimily name Tumpak live in Croatia today, in 50 households. There were 170 of them in the middle of the past century, and their number decreased by 20 percent. They are located in 8 Croatian counties, in 7 cities and 15 other places, mostly in Desno Trebarjevo in Sisak area (30), Zagreb (25), in Lijeva Martinska Ves (20) and Mahovo (15) in Sisak area, and in Poljana (10).