| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 7,783 | 14,018 | 22,402 | |
| 2020 | R | 8,153 | 13,585 | 22,397 | |
| 2016 | R | 6,004 | 10,485 | 17,963 | |
| 2012 | R | 6,830 | 10,281 | 17,693 | |
| 2008 | R | 7,813 | 10,561 | 18,879 | |
| 2004 | R | 6,541 | 11,107 | 17,891 | |
| 2000 | R | 5,906 | 8,766 | 15,464 | |
| 1996 | R | 5,868 | 6,870 | 14,452 | |
| 1992 | R | 5,286 | 5,477 | 15,434 | |
| 1988 | R | 5,197 | 6,893 | 12,338 | |
| 1984 | R | 4,188 | 6,986 | 11,363 | |
| 1980 | R | 3,191 | 5,401 | 9,670 | |
| 1976 | D | 4,037 | 3,699 | 8,018 | |
| 1972 | R | 2,705 | 3,533 | 6,616 | |
| 1968 | D | 2,440 | 2,269 | 5,390 | |
| 1964 | D | 3,410 | 1,682 | 5,098 | |
| 1960 | D | 2,690 | 2,175 | 4,887 | |
| 1956 | D | 2,181 | 2,126 | 4,325 | |
| 1952 | R | 2,070 | 2,303 | 4,416 | |
| 1948 | D | 2,334 | 1,578 | 4,063 | |
| 1944 | D | 1,976 | 1,191 | 3,203 | |
| 1940 | D | 2,762 | 1,372 | 4,176 | |
| 1936 | D | 2,506 | 777 | 3,323 | |
| 1932 | D | 2,367 | 822 | 3,244 | |
| 1928 | D | 1,246 | 990 | 2,244 | |
| 1924 | R | 316 | 719 | 1,847 | |
| 1920 | R | 639 | 1,350 | 2,105 | |
| 1916 | D | 1,766 | 1,209 | 3,138 | |
| 1912 | D | 1,622 | 0 | 2,503 | |
| 1908 | R | 874 | 1,035 | 1,995 | |
| 1904 | R | 915 | 1,279 | 2,349 | |
| 1900 | R | 1,209 | 1,384 | 2,629 | |
| 1896 | D | 1,398 | 1,144 | 2,577 | |
| 1892 | D | 1,255 | 1,125 | 2,614 | |
| 1888 | D | 1,429 | 1,373 | 2,892 | |
| 1884 | D | 1,358 | 1,317 | 2,760 | |
| 1880 | D | 1,411 | 1,345 | 2,760 | |
| 1876 | D | 1,315 | 1,172 | 2,487 |
Amador's small, older, and predominantly white population in the Sierra Nevada foothills has delivered Republican presidential margins exceeding 25 points in recent cycles, making it one of the most reliably conservative counties in the state.
The Republican margin in Amador County reached its widest at thirty-four points in 1920. The margin in 2024 was twenty-eight points, in line with the county's deep historical pattern.
Amador County's loyalty is rooted in its place. Median household income of $88,044, a 76% non-Hispanic-white share, and a population of 41,428 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 Calaveras County and Tuolumne County.
