In Croatia, Tržok families are almost entirely Croats (from Ozalj ), barely Slovenes (from Zagreb ). In the past century, relatively most of Croatian residents bearing this family name were born in Karlovac and Ozalj.
Prevalence
About 40 people with faimily name Tržok live in Croatia today, in 15 households. They are located in two Croatian counties, threee cities and 5 other places, mostly in Vrhovac (15), Karlovac (<10), Zajacko Selo (<10), Ribnik in Ozalj area (<5), and in Zagreb (<5).
Outside Croatia
Family name Tržok (including: Trzok , Trzoch and Terzok ) is present in 6 countries on two continents. The family name "Trzok " is used by some 60 people in Canada and small number in the United States.
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.