 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.The land that is now Omak had been inhabited by various Native American tribes before the arrival of non-indigenous settlers in the early 19th century.