Mušterić families are Croats and they are mostly from Sinj area. In the past century, relatively most of Croatian residents bearing this family name were born in Sinj and in Sinj area.
Prevalence
About 70 people with faimily name Mušterić live in Croatia today, in 30 households. There were 60 of them in the middle of the past century, and their number increased by 20 percent. They are located in threee Croatian counties, in 6 cities and two other places, mostly in Hrvace in Sinj area (35), Zagreb (15), Split (15), Kastel Stari (<10), and in Sinj (<5).
Outside Croatia
Family name Mušterić is present in four countries on two continents. The family name "Musteric " is used by some 50 people in the Netherlands and about 50 in the United States.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 2007 in source Encyclopaedia of Croatian Surnames.