| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 798 | 1,482 | 2,324 | |
| 2020 | R | 963 | 1,573 | 2,649 | |
| 2016 | R | 1,165 | 1,509 | 2,700 | |
| 2012 | R | 1,337 | 1,665 | 3,084 | |
| 2008 | R | 1,471 | 1,757 | 3,318 | |
| 2004 | R | 1,671 | 1,700 | 3,388 | |
| 2000 | D | 1,710 | 1,571 | 3,325 | |
| 1996 | D | 2,118 | 1,041 | 3,435 | |
| 1992 | D | 2,107 | 1,458 | 3,925 | |
| 1988 | D | 1,990 | 1,947 | 3,958 | |
| 1984 | R | 2,035 | 2,361 | 4,472 | |
| 1980 | D | 2,838 | 1,596 | 4,539 | |
| 1976 | D | 3,266 | 1,012 | 4,286 | |
| 1972 | R | 1,402 | 2,152 | 3,554 | |
| 1968 | D | 1,253 | 672 | 3,647 | |
| 1964 | D | 1,779 | 1,625 | 3,447 | |
| 1960 | D | 1,639 | 659 | 2,615 | |
| 1956 | D | 1,726 | 984 | 2,762 | |
| 1952 | D | 2,202 | 737 | 2,944 | |
| 1948 | D | 1,174 | 152 | 1,702 | |
| 1944 | D | 1,238 | 266 | 1,507 | |
| 1940 | D | 1,295 | 118 | 1,467 | |
| 1936 | D | 1,433 | 103 | 1,536 | |
| 1932 | D | 2,139 | 150 | 2,296 | |
| 1928 | D | 1,030 | 503 | 1,537 | |
| 1924 | D | 1,068 | 401 | 1,503 | |
| 1920 | D | 1,140 | 659 | 1,821 | |
| 1916 | D | 1,150 | 527 | 1,677 | |
| 1912 | D | 654 | 228 | 1,316 | |
| 1908 | D | 721 | 636 | 1,437 | |
| 1904 | D | 604 | 496 | 1,152 | |
| 1900 | D | 746 | 514 | 1,274 | |
| 1896 | D | 1,032 | 479 | 1,518 | |
| 1892 | D | 867 | 498 | 1,444 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Dallas County's population has contracted steadily since the 1980s, and its remaining electorate—largely rural and working-class—has shifted decisively toward Republican presidential candidates over the past decade, with 2024 margins approaching 30 points.
The shift began with civil rights. 2004 marked the realignment in Dallas County, by a one points margin. The Republican margin reached its widest at twenty-nine points in 2024. The 2024 margin was twenty-nine points.
The political shift has tracked, in Dallas County, the political shift of the South more broadly. A 53% non-Hispanic-white share, a median household income of $42,500, and a 14% poverty rate describe the demographic context. The county's voting pattern over the last decade is most similar to that of Lafayette County and Nevada County.
