Poznanović families are frequently Serbs and they are mostly from Hrvatska Kostajnica area , less frequently Croats. In the past century, relatively most of Croatian residents bearing this family name were born in Hrvatska Kostajnica area and in Zagreb. In Gornji Žirovac in Hrvatska Kostajnica area every eighth inhabitant had the family name Poznanović.
Prevalence
About 180 people with faimily name Poznanović live in Croatia today, in 90 households. There were 250 of them in the middle of the past century, and their number decreased by 30 percent. They are located in the most of Croatian counties, in 21 cities and 28 other places, mostly in Borovo in Vukovar area (30), Zagreb (25), Kutina (10), Jagodnjak in Beli Manastir area (10), and in Beli Manastir (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1902 in source Hartmann's General List of Apartments in Zagreb.