| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 637 | 2,988 | 3,692 | |
| 2020 | R | 561 | 3,061 | 3,691 | |
| 2016 | R | 436 | 2,791 | 3,450 | |
| 2012 | R | 568 | 2,724 | 3,369 | |
| 2008 | R | 655 | 2,437 | 3,147 | |
| 2004 | R | 566 | 2,403 | 3,003 | |
| 2000 | R | 543 | 2,185 | 2,855 | |
| 1996 | R | 731 | 1,697 | 2,715 | |
| 1992 | R | 778 | 1,231 | 2,850 | |
| 1988 | R | 803 | 1,821 | 2,662 | |
| 1984 | R | 484 | 2,131 | 2,637 | |
| 1980 | R | 462 | 1,971 | 2,647 | |
| 1976 | R | 627 | 1,439 | 2,140 | |
| 1972 | R | 414 | 1,586 | 2,053 | |
| 1968 | R | 502 | 1,294 | 2,003 | |
| 1964 | D | 1,134 | 1,015 | 2,152 | |
| 1960 | R | 794 | 1,391 | 2,188 | |
| 1956 | R | 635 | 1,593 | 2,229 | |
| 1952 | R | 633 | 1,612 | 2,257 | |
| 1948 | R | 752 | 981 | 1,751 | |
| 1944 | R | 451 | 881 | 1,337 | |
| 1940 | R | 530 | 1,021 | 1,559 | |
| 1936 | R | 587 | 830 | 1,488 | |
| 1932 | D | 826 | 687 | 1,545 | |
| 1928 | R | 429 | 860 | 1,313 | |
| 1924 | R | 407 | 766 | 1,259 | |
| 1920 | R | 455 | 793 | 1,274 | |
| 1916 | D | 702 | 468 | 1,186 | |
| 1912 | D | 538 | 372 | 1,119 | |
| 1908 | D | 466 | 384 | 873 | |
| 1904 | R | 391 | 552 | 950 | |
| 1900 | D | 391 | 276 | 675 | |
| 1896 | D | 454 | 52 | 507 | |
| 1892 | R | 0 | 127 | 350 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Rio Blanco's economy is anchored by oil and gas extraction in the Piceance Basin, and its sparse, rural population has delivered Republican presidential margins above 60 points in recent cycles — among the widest in the state.
The Democratic margin in Rio Blanco County peaked at seventy-nine points in 1896. By 1968 the county had flipped, voting Republican for the first time in many years. The 2024 margin was sixty-four points, the most Republican-leaning result in the county's modern history.
The economic context is the key. Rio Blanco County's median household income of $65,473 sits well below state and national norms, and 9% of residents live below the federal poverty line. The shift here is part of a broader realignment of working-class places across the country. The county's voting pattern over the last decade is most similar to that of Duchesne County and Lincoln County.
