| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 1,741 | 8,164 | 9,959 | |
| 2020 | R | 2,068 | 7,975 | 10,087 | |
| 2016 | R | 1,758 | 7,179 | 9,086 | |
| 2012 | R | 2,322 | 6,879 | 9,292 | |
| 2008 | R | 2,548 | 6,630 | 9,220 | |
| 2004 | R | 2,951 | 6,295 | 9,279 | |
| 2000 | R | 3,227 | 5,692 | 9,005 | |
| 1996 | D | 3,720 | 3,482 | 8,048 | |
| 1992 | D | 3,986 | 3,217 | 8,705 | |
| 1988 | D | 4,261 | 3,999 | 8,273 | |
| 1984 | R | 3,610 | 4,863 | 8,501 | |
| 1980 | D | 4,215 | 3,500 | 7,804 | |
| 1976 | D | 4,680 | 2,695 | 7,387 | |
| 1972 | R | 1,792 | 4,292 | 6,092 | |
| 1968 | D | 2,511 | 1,127 | 6,923 | |
| 1964 | D | 3,487 | 2,220 | 5,711 | |
| 1960 | D | 3,266 | 1,679 | 4,993 | |
| 1956 | D | 3,403 | 1,988 | 5,440 | |
| 1952 | D | 4,249 | 1,792 | 6,047 | |
| 1948 | D | 3,051 | 307 | 4,036 | |
| 1944 | D | 2,927 | 428 | 3,564 | |
| 1940 | D | 4,720 | 349 | 5,070 | |
| 1936 | D | 3,167 | 136 | 3,312 | |
| 1932 | D | 3,594 | 120 | 3,734 | |
| 1928 | D | 1,961 | 676 | 2,648 | |
| 1924 | D | 3,408 | 160 | 3,698 | |
| 1920 | D | 1,700 | 150 | 2,336 | |
| 1916 | D | 1,767 | 131 | 2,079 | |
| 1912 | D | 1,507 | 76 | 1,892 | |
| 1908 | — | — | — | — | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Shelby County, tucked into East Texas's Piney Woods along the Louisiana border, has delivered Republican presidential margins above 60 points in recent cycles, reflecting a rural, predominantly white electorate with deep Southern political roots.
The unraveling was not abrupt. The Democratic margin in Shelby County peaked at ninety-three 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-seven points. By 2024, the margin had widened further.
The economic and demographic context is severe. Shelby County's median household income of $49,776 is among the lowest of any county in the United States; 21% of residents live below the federal poverty line. The county's voting pattern over the last decade is most similar to that of McCurtain County and Polk County.