| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 5,224 | 6,128 | 11,717 | |
| 2020 | R | 5,280 | 6,025 | 11,566 | |
| 2016 | R | 3,595 | 4,980 | 9,359 | |
| 2012 | R | 3,783 | 4,709 | 8,768 | |
| 2008 | R | 4,173 | 4,376 | 8,892 | |
| 2004 | R | 3,199 | 4,771 | 8,218 | |
| 2000 | R | 2,154 | 4,523 | 7,406 | |
| 1996 | R | 2,564 | 3,837 | 7,448 | |
| 1992 | R | 2,258 | 2,846 | 7,482 | |
| 1988 | R | 2,526 | 3,823 | 6,465 | |
| 1984 | R | 2,387 | 4,115 | 6,581 | |
| 1980 | R | 1,663 | 3,929 | 6,195 | |
| 1976 | R | 2,364 | 3,281 | 5,740 | |
| 1972 | R | 1,923 | 3,771 | 5,902 | |
| 1968 | R | 1,815 | 3,063 | 5,340 | |
| 1964 | D | 2,824 | 2,619 | 5,453 | |
| 1960 | R | 2,249 | 3,329 | 5,601 | |
| 1956 | R | 2,151 | 3,733 | 5,884 | |
| 1952 | R | 1,969 | 4,152 | 6,150 | |
| 1948 | R | 2,222 | 2,461 | 4,845 | |
| 1944 | R | 2,245 | 2,396 | 4,677 | |
| 1940 | D | 2,833 | 2,433 | 5,319 | |
| 1936 | D | 2,968 | 1,583 | 4,793 | |
| 1932 | D | 2,533 | 1,895 | 4,609 | |
| 1928 | R | 1,338 | 3,095 | 4,496 | |
| 1924 | R | 688 | 2,199 | 4,337 | |
| 1920 | R | 1,155 | 2,537 | 4,020 | |
| 1916 | D | 2,050 | 1,957 | 4,309 | |
| 1912 | D | 666 | 609 | 2,207 | |
| 1908 | R | 952 | 1,305 | 2,563 | |
| 1904 | R | 583 | 1,408 | 2,366 | |
| 1900 | R | 900 | 903 | 1,882 | |
| 1896 | D | 1,252 | 328 | 1,591 | |
| 1892 | R | 1,048 | 1,192 | 2,393 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Park County's economy orbits Yellowstone National Park tourism, drawing a mix of seasonal workers and conservation-minded transplants that keeps its presidential margins tighter than comparably rural Montana counties.
The county's recent history is a story of close margins. The Democratic margin reached fifty-eight points in 1896; the Republican margin reached thirty-nine points in 1928. Most other elections have been decided by single-digit points.
Park County's demographics — a population of 17,710, a 91% non-Hispanic-white share, a median household income of $70,047 — 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 Chelan County and Valley County.