| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 84,161 | 86,684 | 172,705 | |
| 2020 | D | 97,297 | 73,480 | 172,436 | |
| 2016 | D | 85,458 | 50,301 | 140,206 | |
| 2012 | D | 67,239 | 40,592 | 108,698 | |
| 2008 | D | 59,962 | 40,086 | 100,670 | |
| 2004 | R | 38,633 | 43,117 | 82,204 | |
| 2000 | D | 28,187 | 26,237 | 55,690 | |
| 1996 | D | 21,874 | 18,337 | 46,491 | |
| 1992 | R | 15,010 | 19,143 | 45,267 | |
| 1988 | R | 9,812 | 21,355 | 31,381 | |
| 1984 | R | 6,628 | 18,348 | 24,980 | |
| 1980 | R | 6,603 | 10,863 | 18,205 | |
| 1976 | R | 6,893 | 7,062 | 14,175 | |
| 1972 | R | 1,875 | 9,320 | 11,237 | |
| 1968 | R | 1,870 | 4,172 | 9,504 | |
| 1964 | R | 3,531 | 4,516 | 8,047 | |
| 1960 | R | 2,178 | 4,691 | 6,869 | |
| 1956 | R | 1,923 | 3,602 | 5,525 | |
| 1952 | R | 1,900 | 3,133 | 5,033 | |
| 1948 | D | 1,577 | 1,575 | 3,532 | |
| 1944 | D | 1,763 | 1,400 | 3,163 | |
| 1940 | D | 2,015 | 1,428 | 3,443 | |
| 1936 | D | 1,622 | 1,101 | 2,723 | |
| 1932 | D | 1,656 | 906 | 2,562 | |
| 1928 | R | 1,127 | 1,760 | 2,921 | |
| 1924 | D | 884 | 589 | 1,761 | |
| 1920 | R | 728 | 1,035 | 1,871 | |
| 1916 | D | 511 | 453 | 1,162 | |
| 1912 | D | 512 | 110 | 889 | |
| 1908 | D | 193 | 81 | 336 | |
| 1904 | D | 271 | 65 | 353 | |
| 1900 | D | 266 | 42 | 372 | |
| 1896 | D | 274 | 118 | 410 | |
| 1892 | D | 259 | 0 | 275 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Osceola's large Puerto Rican community near Kissimmee has made it a closely watched barometer of Latino voting shifts in central Florida, with the 2024 margin tightening to R+1.4 after years of Democratic-leaning results.
The county's recent history is a story of close margins. The Democratic margin reached ninety-four points in 1892; the Republican margin reached sixty-six points in 1972. Most other elections have been decided by single-digit points.
Osceola County's demographics — a population of 427,415, a 38% non-Hispanic-white share, a median household income of $72,637 — 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 Orange County and Hillsborough County.
