Demark families are Croats and they are mostly from Buzet area. In the past century, relatively most of Croatian residents bearing this family name were born in Rijeka and in Buzet area. In Dolenja Vas in Buzet area every ninth inhabitant had the family name Demark.
Prevalence
About 90 people with faimily name Demark live in Croatia today, in 50 households. There were 140 of them in the middle of the past century, and their number decreased by 40 percent. They are located in two Croatian counties, in 8 cities and 16 other places, mostly in Rijeka (20), Lupoglav in Buzet area (10), Umag (<10), Opatija (<10), and in Pazin (<10).
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.