Petroleum County, Montana
Votes
Percentages
| Year | Democrat | Republican | Other | Total | |||
|---|---|---|---|---|---|---|---|
| 2000 | 36 | 11.8% | 254 | 83.0% | 16 | 5.2% | 306 |
| 2004 | 55 | 18.8% | 228 | 78.1% | 9 | 3.1% | 292 |
| 2008 | 68 | 22.7% | 227 | 75.7% | 5 | 1.7% | 300 |
| 2012 | 49 | 16.4% | 240 | 80.5% | 9 | 3.0% | 298 |
| 2016 | 30 | 9.3% | 278 | 86.3% | 14 | 4.3% | 322 |
| 2020 | 39 | 11.2% | 298 | 85.6% | 11 | 3.2% | 348 |