Hey! I honestly don't know all of the names of the little towns in that part of Croatia. Just looking through various Catholic church records, I have noticed surnames used in town names now and then.
My line of the Milasincic family comes from a small town near Krasic called Konjaric vrh. This town is in the Prekrižje Plešivičko parish records that are available on Family Search.
Do you happen to know the names of Joseph Milasincic's parents? The birth records for Prekrižje Plešivičko on Familysearch only go up through 1900. But - I could check for his parents if you know their names.