| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 6,030 | 12,948 | 19,478 | |
| 2020 | R | 5,887 | 13,081 | 19,370 | |
| 2016 | R | 4,087 | 11,655 | 16,790 | |
| 2012 | R | 4,622 | 10,915 | 15,925 | |
| 2008 | R | 5,084 | 10,067 | 15,434 | |
| 2004 | R | 4,224 | 9,722 | 14,159 | |
| 2000 | R | 3,264 | 8,372 | 12,686 | |
| 1996 | R | 3,584 | 6,047 | 11,100 | |
| 1992 | R | 3,424 | 4,359 | 10,494 | |
| 1988 | R | 3,521 | 5,449 | 9,144 | |
| 1984 | R | 2,835 | 6,678 | 9,639 | |
| 1980 | R | 2,348 | 6,179 | 9,227 | |
| 1976 | R | 3,232 | 4,980 | 8,467 | |
| 1972 | R | 1,903 | 4,890 | 7,220 | |
| 1968 | R | 2,327 | 3,692 | 6,652 | |
| 1964 | D | 3,927 | 2,883 | 6,826 | |
| 1960 | R | 2,689 | 4,644 | 7,343 | |
| 1956 | R | 2,458 | 4,531 | 7,002 | |
| 1952 | R | 2,389 | 4,986 | 7,441 | |
| 1948 | D | 3,171 | 3,158 | 6,469 | |
| 1944 | R | 2,351 | 3,462 | 5,838 | |
| 1940 | R | 3,044 | 4,175 | 7,315 | |
| 1936 | D | 3,230 | 2,661 | 6,468 | |
| 1932 | D | 3,467 | 2,341 | 6,327 | |
| 1928 | R | 1,672 | 3,731 | 5,542 | |
| 1924 | R | 1,345 | 2,752 | 5,063 | |
| 1920 | R | 1,750 | 2,596 | 4,603 | |
| 1916 | D | 2,817 | 1,612 | 4,777 | |
| 1912 | D | 1,808 | 803 | 4,931 | |
| 1908 | D | 2,006 | 1,838 | 4,282 | |
| 1904 | R | 1,046 | 1,567 | 3,094 | |
| 1900 | D | 1,352 | 822 | 2,303 | |
| 1896 | D | 1,603 | 139 | 1,784 | |
| 1892 | R | 0 | 237 | 717 | |
| 1888 | R | 239 | 257 | 584 | |
| 1884 | R | 174 | 230 | 411 | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Delta County sits in Colorado's fruit-growing Grand Valley region, where an economy built on agriculture, coal, and outdoor recreation anchors a voter base that has delivered Republican presidential margins above 30 points in every cycle since 2008.
The Democratic margin in Delta County peaked at eighty-two points in 1896. By 1968 the county had flipped, voting Republican for the first time in many years. The 2024 margin was thirty-six points, the most Republican-leaning result in the county's modern history.
The economic context is the key. Delta County's median household income of $57,774 sits well below state and national norms, and 14% 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 Montrose County and Custer County.