| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 16,591 | 41,298 | 58,362 | |
| 2020 | R | 17,640 | 41,472 | 59,975 | |
| 2016 | R | 16,085 | 36,590 | 56,106 | |
| 2012 | R | 22,687 | 33,867 | 58,241 | |
| 2008 | R | 25,727 | 34,034 | 61,239 | |
| 2004 | R | 24,638 | 36,872 | 61,840 | |
| 2000 | R | 20,572 | 30,138 | 52,779 | |
| 1996 | R | 20,832 | 23,697 | 51,451 | |
| 1992 | R | 19,606 | 23,532 | 56,697 | |
| 1988 | R | 19,617 | 30,047 | 50,047 | |
| 1984 | R | 16,141 | 35,299 | 51,836 | |
| 1980 | R | 18,253 | 29,213 | 50,824 | |
| 1976 | R | 23,065 | 24,310 | 49,251 | |
| 1972 | R | 13,468 | 31,117 | 45,641 | |
| 1968 | R | 14,988 | 23,484 | 43,787 | |
| 1964 | D | 24,799 | 18,833 | 43,632 | |
| 1960 | R | 19,645 | 27,317 | 46,962 | |
| 1956 | R | 13,578 | 26,098 | 39,676 | |
| 1952 | R | 14,780 | 25,829 | 40,609 | |
| 1948 | R | 14,712 | 15,894 | 30,886 | |
| 1944 | R | 15,406 | 18,065 | 33,471 | |
| 1940 | D | 18,645 | 17,157 | 35,802 | |
| 1936 | D | 20,070 | 11,220 | 32,758 | |
| 1932 | D | 15,225 | 12,531 | 28,249 | |
| 1928 | R | 7,295 | 18,468 | 25,909 | |
| 1924 | R | 6,703 | 12,013 | 21,645 | |
| 1920 | R | 9,349 | 10,940 | 20,727 | |
| 1916 | D | 6,985 | 4,886 | 12,283 | |
| 1912 | D | 5,201 | 2,389 | 10,698 | |
| 1908 | D | 6,702 | 5,301 | 12,326 | |
| 1904 | R | 5,407 | 5,587 | 11,438 | |
| 1900 | D | 6,581 | 5,461 | 12,162 | |
| 1896 | D | 6,256 | 5,115 | 11,444 | |
| 1892 | D | 5,398 | 3,994 | 9,796 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Richland County, anchored by Mansfield in north-central Ohio, has shifted steadily rightward over the past two decades; its 2024 presidential margin of R+42.3 reflects a broader rural consolidation that has reshaped statewide electoral math.
The Democratic margin in Richland County peaked at twenty-seven points in 1936. By 1968 the county had flipped, voting Republican for the first time in many years. The 2024 margin was forty-two points, the most Republican-leaning result in the county's modern history.
The economic context is the key. Richland County's median household income of $59,509 sits well below state and national norms, and 14% of residents live below the federal poverty line. The shift here is part of a broader realignment of working-class places across the country. The county's voting pattern over the last decade is most similar to that of Hardin County and Highland County.