| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 110,408 | 127,451 | 243,892 | |
| 2020 | R | 104,653 | 121,270 | 231,599 | |
| 2016 | R | 68,657 | 102,573 | 187,500 | |
| 2012 | R | 61,094 | 104,397 | 168,084 | |
| 2008 | R | 61,960 | 88,108 | 151,819 | |
| 2004 | R | 39,661 | 80,651 | 121,201 | |
| 2000 | R | 27,076 | 56,007 | 86,225 | |
| 1996 | R | 16,232 | 32,120 | 51,975 | |
| 1992 | R | 9,991 | 18,592 | 40,060 | |
| 1988 | R | 6,931 | 17,035 | 24,350 | |
| 1984 | R | 3,011 | 12,249 | 15,441 | |
| 1980 | R | 2,108 | 8,126 | 11,596 | |
| 1976 | R | 2,459 | 5,078 | 7,748 | |
| 1972 | R | 1,048 | 3,625 | 4,800 | |
| 1968 | R | 857 | 1,910 | 3,104 | |
| 1964 | D | 1,442 | 1,336 | 2,791 | |
| 1960 | R | 823 | 1,490 | 2,313 | |
| 1956 | R | 697 | 1,508 | 2,215 | |
| 1952 | R | 637 | 1,427 | 2,068 | |
| 1948 | R | 767 | 979 | 1,756 | |
| 1944 | R | 638 | 1,214 | 1,857 | |
| 1940 | R | 801 | 1,298 | 2,108 | |
| 1936 | D | 1,044 | 895 | 1,968 | |
| 1932 | D | 1,061 | 836 | 1,946 | |
| 1928 | R | 603 | 1,107 | 1,723 | |
| 1924 | R | 383 | 870 | 1,572 | |
| 1920 | R | 561 | 948 | 1,544 | |
| 1916 | D | 820 | 612 | 1,451 | |
| 1912 | D | 619 | 373 | 1,322 | |
| 1908 | R | 629 | 779 | 1,422 | |
| 1904 | R | 524 | 792 | 1,336 | |
| 1900 | D | 650 | 642 | 1,310 | |
| 1896 | D | 1,051 | 172 | 1,233 | |
| 1892 | R | 0 | 360 | 625 | |
| 1888 | R | 307 | 385 | 731 | |
| 1884 | R | 246 | 288 | 540 | |
| 1880 | R | 282 | 331 | 615 | |
| 1876 | — | — | — | — |
Douglas County has shifted notably leftward over two decades as professional-class migration from the Denver metro reshaped its electorate, narrowing a margin that once ran 40+ points Republican to single digits by 2024.
The Republican margin in Douglas County reached its widest at sixty points in 1984. The margin in 2024 was seven points, in line with the county's deep historical pattern.
Douglas County's loyalty is rooted in its place. Median household income of $149,594, a 80% non-Hispanic-white share, and a population of 377,150 together describe a community whose political habits are deeply settled. The county's voting pattern over the last decade is most similar to that of Delaware County and El Paso County.
