Iowa Counties with the most and highest percentage of democrat voters; the most and highest percentage of republican voters and the most and highest percentage of other voters in the 2016 presidential election.

Iowa Metropolitan Areas: Ames - Boone - Burlington - Carroll - Cedar Rapids - Clinton - Davenport-Moline-Rock Island - Des Moines-West Des Moines - Dubuque - Fort Dodge - Iowa City - Marshalltown - Mason City - Muscatine - Newton - Omaha-Council Bluffs - Oskaloosa - Ottumwa - Pella - Sioux City - Spirit Lake - Storm Lake - Waterloo-Cedar Falls