In the past century, relatively most of Croatian residents bearing this family name were born in Middle Bosnia (Breza area). In Župča in Middle Bosnia nearly every inhabitant had the family name Opačin.
Prevalence
Only a few people with faimily name Opačin live in Croatia today, in one household only. They are located in two Croatian counties, in one city and another small place , mostly in Podstrana in Solin area (<5) and Pula (<5).
Outside Croatia
Family name Opačin (including: Opacin , Opachin ) is present in four countries.
In the sources analysed in the project Acta Croatica so far, the name is mentioned over ten times, the first time 1906 in source Yearbook and Directory of Literary Society of St. Jerome 1906.