| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | D | 130,071 | 127,443 | 263,734 | |
| 2020 | D | 128,128 | 116,760 | 252,142 | |
| 2016 | D | 97,379 | 94,758 | 209,909 | |
| 2012 | D | 95,409 | 88,453 | 187,855 | |
| 2008 | D | 99,671 | 76,880 | 179,175 | |
| 2004 | R | 74,841 | 81,545 | 159,079 | |
| 2000 | R | 52,097 | 63,640 | 122,301 | |
| 1996 | R | 44,915 | 49,477 | 109,266 | |
| 1992 | R | 39,500 | 42,636 | 114,671 | |
| 1988 | R | 32,902 | 52,654 | 88,728 | |
| 1984 | R | 22,321 | 50,418 | 74,511 | |
| 1980 | R | 15,621 | 41,276 | 64,956 | |
| 1976 | R | 21,687 | 29,264 | 53,227 | |
| 1972 | R | 17,106 | 33,539 | 50,645 | |
| 1968 | R | 14,560 | 23,492 | 42,988 | |
| 1964 | D | 20,170 | 18,350 | 38,520 | |
| 1960 | R | 15,280 | 18,833 | 34,113 | |
| 1956 | R | 9,525 | 18,865 | 28,390 | |
| 1952 | R | 8,888 | 19,044 | 27,932 | |
| 1948 | R | 8,365 | 11,323 | 20,188 | |
| 1944 | R | 8,384 | 9,024 | 17,408 | |
| 1940 | D | 9,243 | 8,062 | 17,305 | |
| 1936 | D | 9,514 | 4,358 | 13,872 | |
| 1932 | D | 8,141 | 4,333 | 12,474 | |
| 1928 | R | 3,952 | 5,767 | 9,719 | |
| 1924 | R | 1,669 | 3,549 | 7,766 | |
| 1920 | R | 2,357 | 4,189 | 6,865 | |
| 1916 | D | 3,341 | 3,225 | 7,098 | |
| 1912 | D | 1,446 | 644 | 3,602 | |
| 1908 | R | 1,745 | 2,053 | 4,105 | |
| 1904 | R | 721 | 1,517 | 2,552 | |
| 1900 | D | 1,005 | 919 | 1,924 | |
| 1896 | D | 1,168 | 513 | 1,681 | |
| 1892 | R | 235 | 530 | 1,628 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Washoe anchors Nevada's second-largest metro and has trended Democratic over two decades of in-migration, flipping from a double-digit Republican stronghold to a county decided by single digits in every presidential race since 2016.
The county's recent history is a story of close margins. The Democratic margin reached thirty-nine points in 1896; the Republican margin reached thirty-nine points in 1980. Most other elections have been decided by single-digit points.
Washoe County's demographics — a population of 497,200, a 63% non-Hispanic-white share, a median household income of $88,096 — situate the county close to national averages on several dimensions. The county's voting pattern over the last decade is most similar to that of DeKalb County and Centre County.
