| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 42,007 | 42,676 | 85,752 | |
| 2020 | D | 44,060 | 38,726 | 83,829 | |
| 2016 | D | 33,918 | 33,386 | 70,008 | |
| 2012 | D | 35,221 | 26,867 | 63,023 | |
| 2008 | D | 39,453 | 28,293 | 68,443 | |
| 2004 | R | 27,967 | 27,971 | 56,342 | |
| 2000 | R | 21,939 | 23,265 | 46,878 | |
| 1996 | R | 16,547 | 17,326 | 39,065 | |
| 1992 | R | 13,468 | 14,557 | 37,500 | |
| 1988 | R | 9,859 | 17,185 | 27,371 | |
| 1984 | R | 8,193 | 16,109 | 24,474 | |
| 1980 | R | 7,551 | 12,357 | 22,289 | |
| 1976 | R | 9,544 | 10,228 | 20,165 | |
| 1972 | R | 5,619 | 12,701 | 18,814 | |
| 1968 | R | 6,946 | 9,465 | 17,747 | |
| 1964 | D | 10,622 | 6,281 | 17,019 | |
| 1960 | R | 6,312 | 11,299 | 17,726 | |
| 1956 | R | 5,506 | 10,081 | 15,679 | |
| 1952 | R | 5,760 | 9,502 | 15,304 | |
| 1948 | R | 5,913 | 6,674 | 12,587 | |
| 1944 | R | 5,490 | 6,202 | 11,729 | |
| 1940 | D | 6,670 | 6,001 | 12,687 | |
| 1936 | D | 8,212 | 5,778 | 14,079 | |
| 1932 | D | 6,357 | 4,659 | 11,199 | |
| 1928 | R | 3,266 | 7,469 | 10,762 | |
| 1924 | D | 3,901 | 3,462 | 7,819 | |
| 1920 | D | 3,396 | 3,278 | 6,828 | |
| 1916 | D | 3,348 | 1,456 | 4,886 | |
| 1912 | D | 3,107 | 536 | 4,604 | |
| 1908 | D | 3,004 | 1,454 | 4,599 | |
| 1904 | D | 2,587 | 1,446 | 4,196 | |
| 1900 | D | 3,054 | 1,264 | 4,516 | |
| 1896 | D | 2,887 | 1,447 | 4,551 | |
| 1892 | D | 3,078 | 1,020 | 4,159 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Once reliably Democratic thanks to union households and Northeastern transplants, Monroe County flipped to a slim Republican margin in 2024 — a swing that tracks its transition from a blue-collar bedroom community to a more politically mixed exurban destination.
The county's recent history is a story of close margins. The Democratic margin reached fifty-six points in 1912; the Republican margin reached thirty-nine points in 1928. Most other elections have been decided by single-digit points.
Monroe County's demographics — a population of 167,515, a 64% non-Hispanic-white share, a median household income of $83,565 — 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 Washoe County and DeKalb County.
