| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 188 | 1,087 | 1,299 | |
| 2020 | R | 222 | 1,075 | 1,324 | |
| 2016 | R | 192 | 892 | 1,137 | |
| 2012 | R | 272 | 921 | 1,215 | |
| 2008 | R | 441 | 915 | 1,375 | |
| 2004 | R | 1,201 | 2,017 | 3,271 | |
| 2000 | D | 1,073 | 295 | 1,417 | |
| 1996 | R | 463 | 1,080 | 1,735 | |
| 1992 | R | 478 | 945 | 1,752 | |
| 1988 | R | 571 | 1,358 | 1,936 | |
| 1984 | R | 418 | 1,813 | 2,236 | |
| 1980 | R | 287 | 2,056 | 2,402 | |
| 1976 | R | 693 | 1,662 | 2,367 | |
| 1972 | R | 579 | 1,950 | 2,535 | |
| 1968 | R | 389 | 2,105 | 2,620 | |
| 1964 | R | 723 | 1,891 | 2,614 | |
| 1960 | R | 616 | 2,354 | 2,970 | |
| 1956 | R | 1,635 | 1,639 | 3,274 | |
| 1952 | R | 436 | 2,915 | 3,351 | |
| 1948 | R | 611 | 2,034 | 2,668 | |
| 1944 | R | 410 | 2,290 | 2,700 | |
| 1940 | R | 826 | 2,839 | 3,665 | |
| 1936 | R | 1,556 | 1,921 | 3,505 | |
| 1932 | D | 2,650 | 606 | 3,302 | |
| 1928 | D | 1,468 | 1,234 | 2,711 | |
| 1924 | R | 94 | 833 | 2,889 | |
| 1920 | R | 112 | 1,470 | 2,016 | |
| 1916 | D | 992 | 224 | 1,239 | |
| 1912 | D | 327 | 0 | 995 | |
| 1908 | R | 157 | 785 | 959 | |
| 1904 | R | 144 | 727 | 934 | |
| 1900 | R | 297 | 898 | 1,211 | |
| 1896 | R | 361 | 512 | 879 | |
| 1892 | R | 221 | 487 | 964 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
McPherson County sits in the sparsely settled north-central plains, where a small, heavily rural electorate has produced some of the widest presidential margins in the state — R+69.2 in 2024.
The unraveling was not abrupt. The Democratic margin in McPherson County peaked at sixty-two points in 1916; it narrowed steadily over the late twentieth century. The 2004 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. McPherson County's median household income of $66,906 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 Campbell County and Polk County.
