 Approximately 89.5 percent of residents over the age of five spoke English at home, according to the 2007–2011 American Community Survey.It was then estimated that 889 people, comprising 18.5 percent of local inhabitants have German ancestrythe largest ethnicity in Omakand 15.3 percent have Irish ancestry.The Omak area has a relatively high percentage of people of American Indian and Mexican ancestries; there were over 800 American Indians and over 535 Mexican immigrants, with a combined percentage of 28 percent of residents.