| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 1,066 | 2,913 | 3,984 | |
| 2020 | R | 1,222 | 2,850 | 4,100 | |
| 2016 | R | 1,136 | 2,519 | 3,686 | |
| 2012 | R | 1,305 | 2,440 | 3,776 | |
| 2008 | R | 1,198 | 2,426 | 3,644 | |
| 2004 | R | 1,263 | 2,279 | 3,555 | |
| 2000 | R | 1,065 | 1,797 | 2,883 | |
| 1996 | D | 1,194 | 815 | 2,255 | |
| 1992 | D | 1,473 | 1,314 | 3,295 | |
| 1988 | R | 927 | 1,567 | 2,494 | |
| 1984 | R | 1,199 | 1,733 | 2,932 | |
| 1980 | D | 1,854 | 1,123 | 3,029 | |
| 1976 | D | 2,210 | 698 | 2,908 | |
| 1972 | R | 417 | 2,201 | 2,618 | |
| 1968 | D | 446 | 381 | 2,868 | |
| 1964 | R | 682 | 1,940 | 2,622 | |
| 1960 | D | 1,298 | 488 | 1,786 | |
| 1956 | D | 1,607 | 179 | 1,786 | |
| 1952 | D | 1,808 | 344 | 2,152 | |
| 1948 | D | 685 | 67 | 1,256 | |
| 1944 | D | 978 | 304 | 1,282 | |
| 1940 | D | 2,386 | 306 | 2,704 | |
| 1936 | D | 1,861 | 334 | 2,205 | |
| 1932 | D | 1,314 | 18 | 1,340 | |
| 1928 | D | 632 | 284 | 916 | |
| 1924 | D | 1,058 | 194 | 1,368 | |
| 1920 | D | 306 | 74 | 380 | |
| 1916 | D | 715 | 20 | 885 | |
| 1912 | D | 285 | 23 | 400 | |
| 1908 | R | 135 | 162 | 655 | |
| 1904 | D | 257 | 59 | 674 | |
| 1900 | R | 276 | 321 | 663 | |
| 1896 | R | 213 | 239 | 473 | |
| 1892 | D | 393 | 247 | 1,382 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Johnson County's small, predominantly rural population has delivered lopsided Republican margins for decades, with 2024's R+46.4 result reflecting a broader pattern of consolidation in Georgia's agrarian heartland.
The unraveling was not abrupt. The Democratic margin in Johnson County peaked at ninety-seven points in 1932; 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. Johnson County's median household income of $51,028 is among the lowest of any county in the United States; 24% of residents live below the federal poverty line. The county's voting pattern over the last decade is most similar to that of Catahoula Parish and Winn Parish.
