 The municipality has been named a " tree city " for ten consecutive years since April 2007 . The Washington Department of Natural Resources announced on April 11 , 2013 , that Omak had again been named a " tree city " because of their continuous efforts to " keep urban forests healthy and vibrant " for 15 years . The City of Omak brands itself as the " Heart of the Okanogan " — referring to its significant economic importance in the Okanogan . The Okanogan County Tourism Council uses the same branding to define the Greater Omak region . It is officially recognized as the City of Omak ; Omak residents are known as Omakians . 
