Dewey-Humboldt is a town in Yavapai County, Arizona, United States. The estimated population of the town was 3,613 according to the 2005 census estimates; however, the Arizona Department of Commerce estimates a 2005 population of 4,030. Dewey-Humboldt apartments for rent comparison page shows most up to date rent information on Dewey-Humboldt apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.