O'Brien County, Iowa
Votes
Percentages
| Year | Democrat | Republican | Other | Total | |||
|---|---|---|---|---|---|---|---|
| 2000 | 2,170 | 30.8% | 4,674 | 66.4% | 200 | 2.8% | 7,044 |
| 2004 | 2,330 | 30.1% | 5,328 | 68.9% | 73 | 0.9% | 7,731 |
| 2008 | 2,338 | 31.9% | 4,894 | 66.7% | 101 | 1.4% | 7,333 |
| 2012 | 1,969 | 26.8% | 5,266 | 71.7% | 106 | 1.4% | 7,341 |
| 2016 | 1,315 | 17.8% | 5,752 | 77.7% | 339 | 4.6% | 7,406 |
| 2020 | 1,569 | 20.8% | 5,871 | 77.8% | 111 | 1.5% | 7,551 |