 Omak ( / <unk> / o @-@ <unk> ) is a city located in the foothills of the Okanogan Highlands in north @-@ central Washington , United States . With an estimated 4 @,@ 854 residents as of 2015 , distributed over a land area of 3 @.@ 43 square miles ( 8 @.@ 9 km2 ) , Omak is the largest municipality of Okanogan County and the largest municipality in Central Washington north of Wenatchee . The Greater Omak Area of around 8 @,@ 229 inhabitants as of the 2010 census is the largest urban cluster in the Okanogan Country region , encompassing most of its twin city of Okanogan . The population has increased significantly since the 1910 census , reporting 520 residents just prior to incorporation in 1911 . 
