| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 17,923 | 26,063 | 44,316 | |
| 2020 | R | 21,881 | 25,693 | 48,029 | |
| 2016 | R | 18,971 | 21,904 | 42,478 | |
| 2012 | D | 19,404 | 19,234 | 39,057 | |
| 2008 | D | 20,907 | 18,933 | 40,272 | |
| 2004 | D | 19,654 | 19,467 | 39,535 | |
| 2000 | D | 16,487 | 16,063 | 33,895 | |
| 1996 | D | 15,251 | 12,076 | 32,544 | |
| 1992 | D | 10,450 | 9,898 | 28,789 | |
| 1988 | R | 10,157 | 15,928 | 26,405 | |
| 1984 | R | 7,774 | 16,332 | 24,115 | |
| 1980 | R | 7,920 | 11,644 | 21,806 | |
| 1976 | D | 11,079 | 8,232 | 19,757 | |
| 1972 | R | 4,469 | 11,688 | 16,193 | |
| 1968 | D | 5,534 | 5,094 | 14,899 | |
| 1964 | D | 8,936 | 4,842 | 13,778 | |
| 1960 | D | 6,972 | 3,416 | 10,388 | |
| 1956 | D | 4,327 | 3,337 | 7,664 | |
| 1952 | D | 4,941 | 2,943 | 7,884 | |
| 1948 | D | 3,759 | 548 | 4,503 | |
| 1944 | D | 3,882 | 566 | 4,448 | |
| 1940 | D | 4,102 | 463 | 4,565 | |
| 1936 | D | 2,605 | 282 | 2,887 | |
| 1932 | D | 2,838 | 336 | 3,174 | |
| 1928 | D | 1,899 | 1,142 | 3,092 | |
| 1924 | D | 835 | 262 | 1,232 | |
| 1920 | D | 979 | 510 | 1,747 | |
| 1916 | D | 730 | 345 | 1,431 | |
| 1912 | D | 1,023 | 414 | 1,836 | |
| 1908 | D | 630 | 227 | 1,166 | |
| 1904 | D | 680 | 287 | 1,111 | |
| 1900 | D | 747 | 252 | 1,127 | |
| 1896 | D | 452 | 369 | 906 | |
| 1892 | D | 767 | 0 | 843 | |
| 1888 | — | — | — | — | |
| 1884 | R | 888 | 906 | 1,794 | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Monroe County, anchored by the Florida Keys, shifted to an R+18.3 margin in 2024—a striking result for a tourism-driven coastal enclave where transient workers and retirees share a narrow string of barrier islands.
The Democratic margin in Monroe County has rarely exceeded ninety-one points in modern history; the Republican margin has rarely exceeded forty-five points. 2024 delivered the county to the Republican candidate by eighteen points.
Monroe County's demographics resemble the country more than they resemble most counties. A 70% non-Hispanic-white share, a 11% poverty rate, and a median household income of $87,738 — all within the broad national range. The county's voting pattern over the last decade is most similar to that of Chickasaw County and Macomb County.
