Posavec families are Croats and they are mostly from Varazdinske Toplice. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Cakovec. In places Drenovec and Leskovec Toplički in Varazdinske Toplice every seventh inhabitant had the family name Posavec.
About 3500 people with faimily name Posavec live in Croatia today, in 1400 households. There were 3800 of them in the middle of the past century, and their number decreased by 10 percent. They are located in almost all Croatian counties, in 64 cities and 368 other places, mostly in Zagreb (490), Nedelisce in Cakovec area (175), Koprivnica (170), Cakovec (155), and in Varazdin (140).