In Croatia, Mrmoš families are generally Serbs, rarely Croats (from Virovitica area ). In the past century, relatively most of Croatian residents bearing this family name were born in Vinkovci area and in Vinkovci.
Prevalence
About 50 people with faimily name Mrmoš live in Croatia today, in 20 households. There were 90 of them in the middle of the past century, and their number decreased by 40 percent. They are located in four Croatian counties and 6 other places, mostly in Ostrovo in Vinkovci area (20), Vukovar (<10), Virovitica (<10), Slatina (<5), and in Gabos in Vinkovci area (<5).
Outside Croatia
Family name Mrmoš (including: Mrmos , Mrmosh ) is present in three countries on two continents. "Mrmosh " is used by few people in the United States.
In the sources analysed in the project Acta Croatica so far, the name is mentioned few times, the first time 1917 in source List of Dignitaries, Officials and Public Servants of the Kingdom of Croatia-Slavonia.