| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 2,332 | 3,473 | 5,953 | |
| 2020 | R | 2,265 | 3,542 | 5,945 | |
| 2016 | R | 1,612 | 3,010 | 5,181 | |
| 2012 | R | 1,964 | 2,928 | 5,102 | |
| 2008 | R | 2,352 | 3,017 | 5,485 | |
| 2004 | R | 1,926 | 3,162 | 5,157 | |
| 2000 | R | 1,689 | 2,721 | 4,586 | |
| 1996 | D | 2,154 | 2,140 | 4,805 | |
| 1992 | D | 1,771 | 1,562 | 4,418 | |
| 1988 | R | 1,595 | 2,507 | 4,165 | |
| 1984 | R | 1,335 | 2,663 | 4,035 | |
| 1980 | R | 1,169 | 2,222 | 3,555 | |
| 1976 | R | 1,564 | 1,665 | 3,262 | |
| 1972 | R | 934 | 2,074 | 3,074 | |
| 1968 | R | 930 | 1,624 | 2,846 | |
| 1964 | D | 1,633 | 1,501 | 3,149 | |
| 1960 | R | 1,220 | 1,890 | 3,117 | |
| 1956 | R | 1,035 | 1,954 | 3,006 | |
| 1952 | R | 1,158 | 2,033 | 3,196 | |
| 1948 | D | 1,389 | 1,274 | 2,680 | |
| 1944 | R | 1,008 | 1,112 | 2,128 | |
| 1940 | D | 1,534 | 1,372 | 2,910 | |
| 1936 | D | 1,587 | 951 | 2,562 | |
| 1932 | D | 1,515 | 667 | 2,210 | |
| 1928 | R | 657 | 766 | 1,424 | |
| 1924 | R | 546 | 632 | 1,312 | |
| 1920 | R | 642 | 862 | 1,518 | |
| 1916 | D | 493 | 460 | 976 | |
| 1912 | D | 352 | 176 | 625 | |
| 1908 | — | — | — | — | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Sierra County's roughly 13,000 residents are spread across high desert and mountain terrain along the Rio Grande, and it has delivered Republican presidential margins in the high teens to low twenties in each of the last three cycles.
The Republican margin in Sierra County reached its widest at thirty-seven points in 1972. The margin in 2024 was nineteen points, in line with the county's deep historical pattern.
Sierra County's loyalty is rooted in its place. Median household income of $41,600, a 69% non-Hispanic-white share, and a population of 11,500 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 Charlevoix County and Floyd County.
