Topolko families are Croats and they are mostly from Krizevci. In the past century, relatively most of Croatian residents bearing this family name were born in Zagreb and Krizevci. In Apatovec in Krizevci every twentieth inhabitant had the family name Topolko.
Prevalence
About 240 people with faimily name Topolko live in Croatia today, in 100 households. There were 230 of them in the middle of the past century, and their number remains constant. They are located in the most of Croatian counties, in 19 cities and 31 other places, mostly in Zagreb (60), Remetinec (25), Krizevci (20), Cakovec (20), and in Kupinec in Jastrebarsko area (15).
Outside Croatia
At least one family with this surname emigrated from Croatia to the United States. Family name Topolko is present in three countries.
In the sources analysed in the project Acta Croatica so far, the name is mentioned over five times, the first time 2007 in source Encyclopaedia of Croatian Surnames.