| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 847 | 3,936 | 4,898 | |
| 2020 | R | 897 | 3,881 | 4,914 | |
| 2016 | R | 638 | 3,477 | 4,417 | |
| 2012 | R | 749 | 3,363 | 4,259 | |
| 2008 | R | 908 | 3,334 | 4,354 | |
| 2004 | R | 676 | 3,231 | 3,991 | |
| 2000 | R | 555 | 2,886 | 3,550 | |
| 1996 | R | 815 | 2,071 | 3,309 | |
| 1992 | R | 656 | 1,614 | 3,146 | |
| 1988 | R | 707 | 2,081 | 2,858 | |
| 1984 | R | 558 | 2,634 | 3,241 | |
| 1980 | R | 635 | 2,291 | 3,148 | |
| 1976 | R | 797 | 2,042 | 2,866 | |
| 1972 | R | 436 | 2,203 | 2,650 | |
| 1968 | R | 398 | 1,737 | 2,352 | |
| 1964 | R | 852 | 1,640 | 2,492 | |
| 1960 | R | 798 | 1,806 | 2,604 | |
| 1956 | R | 578 | 1,842 | 2,420 | |
| 1952 | R | 543 | 1,980 | 2,524 | |
| 1948 | R | 682 | 1,351 | 2,045 | |
| 1944 | R | 756 | 1,384 | 2,140 | |
| 1940 | R | 781 | 1,460 | 2,247 | |
| 1936 | R | 949 | 1,266 | 2,333 | |
| 1932 | D | 1,171 | 1,101 | 2,340 | |
| 1928 | R | 590 | 1,369 | 1,977 | |
| 1924 | R | 293 | 1,097 | 1,891 | |
| 1920 | R | 525 | 1,202 | 1,733 | |
| 1916 | R | 812 | 814 | 1,656 | |
| 1912 | D | 524 | 522 | 1,396 | |
| 1908 | R | 614 | 781 | 1,410 | |
| 1904 | R | 459 | 725 | 1,192 | |
| 1900 | R | 440 | 466 | 906 | |
| 1896 | D | 467 | 284 | 753 | |
| 1892 | R | 0 | 309 | 901 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
With roughly 7,000 residents spread across the Powder River basin and Big Horn foothills, Johnson County delivers lopsided Republican margins that rank among the widest in a state already dominated by that party's voters.
The Republican margin in Johnson County reached its widest at sixty-seven points in 1972. The margin in 2024 was sixty-three points, in line with the county's deep historical pattern.
Johnson County's loyalty is rooted in its place. Median household income of $64,871, a 92% non-Hispanic-white share, and a population of 8,686 together describe a community whose political habits are deeply settled. The county's voting pattern over the last decade is most similar to that of Park County and Bandera County.
