| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | D | 3,463 | 3,005 | 6,698 | |
| 2020 | D | 3,318 | 2,858 | 6,347 | |
| 2016 | R | 2,159 | 2,167 | 4,975 | |
| 2012 | R | 1,926 | 2,458 | 4,523 | |
| 2008 | D | 2,302 | 2,263 | 4,658 | |
| 2004 | R | 1,416 | 2,235 | 3,690 | |
| 2000 | R | 720 | 1,745 | 2,671 | |
| 1996 | R | 866 | 1,251 | 2,488 | |
| 1992 | R | 472 | 762 | 1,918 | |
| 1988 | R | 531 | 982 | 1,527 | |
| 1984 | R | 370 | 1,242 | 1,624 | |
| 1980 | R | 360 | 1,227 | 1,686 | |
| 1976 | R | 514 | 904 | 1,434 | |
| 1972 | R | 298 | 932 | 1,359 | |
| 1968 | R | 376 | 694 | 1,198 | |
| 1964 | R | 598 | 675 | 1,273 | |
| 1960 | R | 569 | 714 | 1,283 | |
| 1956 | R | 451 | 842 | 1,293 | |
| 1952 | R | 491 | 964 | 1,455 | |
| 1948 | D | 672 | 593 | 1,272 | |
| 1944 | D | 641 | 552 | 1,193 | |
| 1940 | D | 844 | 667 | 1,511 | |
| 1936 | D | 834 | 542 | 1,409 | |
| 1932 | D | 860 | 674 | 1,541 | |
| 1928 | R | 348 | 753 | 1,103 | |
| 1924 | R | 186 | 665 | 1,194 | |
| 1920 | R | 409 | 906 | 1,315 | |
| 1916 | D | 726 | 650 | 1,400 | |
| 1912 | — | — | — | — | |
| 1908 | — | — | — | — | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Teton County's small but notably left-leaning electorate stands out sharply against its neighbors, likely shaped by the outdoor-recreation economy and migration patterns tied to the Greater Yellowstone region just across the Wyoming border.
The Democratic margin in Teton County has rarely exceeded twenty-one points in modern history; the Republican margin has rarely exceeded fifty-four points. 2024 delivered the county to the Democratic candidate by seven points.
Teton County's demographics resemble the country more than they resemble most counties. A 81% non-Hispanic-white share, a 9% poverty rate, and a median household income of $99,805 — all within the broad national range. The county's voting pattern over the last decade is most similar to that of Gallatin County and Kent County.