| Top 2016 Iowa Presidential Republican Counties by Percentage |
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| Rank | Region | Votes | % of Votes |
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| 1 | Sioux County | 14,761 | 82.1 | | 2 | Lyon County | 5,188 | 81.9 | | 3 | Osceola County | 2,528 | 79.1 | | 4 | O'Brien County | 5,735 | 78.0 | | 5 | Ida County | 2,655 | 74.0 | | 6 | Plymouth County | 9,659 | 74.0 | | 7 | Sac County | 3,692 | 71.6 | 
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