| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 3,731 | 12,541 | 16,698 | |
| 2020 | R | 3,823 | 12,229 | 16,603 | |
| 2016 | R | 3,231 | 12,154 | 17,130 | |
| 2012 | R | 4,774 | 11,428 | 16,895 | |
| 2008 | R | 5,762 | 10,360 | 16,703 | |
| 2004 | R | 5,208 | 10,653 | 16,272 | |
| 2000 | R | 5,521 | 9,425 | 15,691 | |
| 1996 | D | 7,088 | 5,591 | 15,634 | |
| 1992 | D | 6,417 | 4,476 | 14,910 | |
| 1988 | R | 6,720 | 6,780 | 13,705 | |
| 1984 | R | 5,230 | 8,308 | 13,712 | |
| 1980 | R | 4,728 | 6,265 | 12,067 | |
| 1976 | D | 5,575 | 4,937 | 10,574 | |
| 1972 | R | 3,713 | 5,175 | 8,915 | |
| 1968 | D | 4,086 | 2,726 | 7,449 | |
| 1964 | D | 5,969 | 1,944 | 7,913 | |
| 1960 | D | 5,398 | 2,545 | 7,943 | |
| 1956 | D | 4,747 | 3,355 | 8,102 | |
| 1952 | D | 5,807 | 3,567 | 9,374 | |
| 1948 | D | 5,146 | 2,538 | 8,085 | |
| 1944 | D | 5,599 | 2,623 | 8,222 | |
| 1940 | D | 6,637 | 2,439 | 9,094 | |
| 1936 | D | 6,232 | 1,797 | 8,097 | |
| 1932 | D | 4,637 | 2,043 | 6,983 | |
| 1928 | D | 2,974 | 2,528 | 5,599 | |
| 1924 | D | 2,219 | 2,119 | 5,026 | |
| 1920 | R | 1,216 | 1,744 | 3,221 | |
| 1916 | D | 1,496 | 1,287 | 2,939 | |
| 1912 | D | 916 | 888 | 2,483 | |
| 1908 | R | 637 | 1,299 | 2,221 | |
| 1904 | R | 464 | 1,473 | 2,064 | |
| 1900 | R | 740 | 1,101 | 1,841 | |
| 1896 | D | 996 | 754 | 1,787 | |
| 1892 | R | 0 | 674 | 1,433 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Sweetwater County sits atop some of the world's largest trona deposits and significant natural gas reserves, drawing a workforce whose economic priorities consistently produce some of Wyoming's most lopsided federal election margins.
The unraveling was not abrupt. The Democratic margin in Sweetwater County peaked at fifty-five points in 1936; it narrowed steadily over the late twentieth century. The 2000 election delivered the county to the Republican party for the first time in many years, by a margin of twenty-five points. By 2024, the margin had widened further.
The economic and demographic context is severe. Sweetwater County's median household income of $75,034 is among the lowest of any county in the United States; 13% of residents live below the federal poverty line. The county's voting pattern over the last decade is most similar to that of Harrison County and Limestone County.