| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 7,369 | 22,658 | 30,243 | |
| 2020 | R | 7,908 | 21,466 | 29,717 | |
| 2016 | R | 7,151 | 18,749 | 26,548 | |
| 2012 | R | 8,456 | 17,512 | 26,170 | |
| 2008 | R | 8,887 | 17,103 | 26,158 | |
| 2004 | R | 9,642 | 16,473 | 26,223 | |
| 2000 | R | 8,878 | 13,834 | 22,970 | |
| 1996 | D | 10,307 | 9,835 | 21,655 | |
| 1992 | D | 9,538 | 8,733 | 22,683 | |
| 1988 | R | 8,974 | 11,957 | 21,285 | |
| 1984 | R | 7,773 | 12,618 | 20,509 | |
| 1980 | R | 7,746 | 9,328 | 17,493 | |
| 1976 | D | 7,796 | 7,787 | 15,639 | |
| 1972 | R | 4,333 | 9,600 | 14,060 | |
| 1968 | D | 4,959 | 3,668 | 13,951 | |
| 1964 | D | 6,351 | 5,568 | 11,930 | |
| 1960 | D | 5,108 | 4,613 | 9,945 | |
| 1956 | R | 2,668 | 5,048 | 7,795 | |
| 1952 | R | 4,516 | 4,708 | 9,229 | |
| 1948 | D | 2,504 | 946 | 5,588 | |
| 1944 | D | 3,588 | 619 | 5,009 | |
| 1940 | D | 4,515 | 681 | 5,196 | |
| 1936 | D | 3,400 | 302 | 3,708 | |
| 1932 | D | 4,057 | 528 | 4,604 | |
| 1928 | D | 2,023 | 1,776 | 3,804 | |
| 1924 | D | 2,573 | 463 | 3,262 | |
| 1920 | D | 2,134 | 377 | 3,181 | |
| 1916 | D | 1,374 | 172 | 1,616 | |
| 1912 | D | 1,140 | 140 | 1,445 | |
| 1908 | — | — | — | — | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Harrison County sits in the Piney Woods of East Texas, where Republican presidential margins have exceeded 50 points in recent cycles. Marshall, the county seat, carries a legacy as a 19th-century railroad hub that still shapes its small-city economy.
The Democratic margin in Harrison County peaked at eighty-four points in 1936. By 2000 the county had flipped, voting Republican for the first time in many years. The 2024 margin was fifty-one points, the most Republican-leaning result in the county's modern history.
The economic context is the key. Harrison County's median household income of $66,103 sits well below state and national norms, and 16% 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 Gilchrist County and Polk County.