| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 2,531 | 3,660 | 6,256 | |
| 2020 | R | 3,067 | 3,891 | 7,050 | |
| 2016 | R | 3,129 | 3,756 | 7,005 | |
| 2012 | R | 3,490 | 3,641 | 7,203 | |
| 2008 | R | 3,589 | 3,776 | 7,430 | |
| 2004 | R | 3,399 | 3,612 | 7,157 | |
| 2000 | D | 3,413 | 3,269 | 7,006 | |
| 1996 | D | 4,335 | 2,402 | 7,384 | |
| 1992 | D | 3,899 | 2,412 | 7,432 | |
| 1988 | D | 3,705 | 3,680 | 7,537 | |
| 1984 | R | 3,530 | 4,587 | 8,226 | |
| 1980 | D | 4,123 | 3,508 | 7,770 | |
| 1976 | D | 3,402 | 2,499 | 6,011 | |
| 1972 | R | 1,890 | 3,384 | 5,737 | |
| 1968 | D | 1,768 | 941 | 6,175 | |
| 1964 | D | 3,740 | 855 | 4,595 | |
| 1960 | R | 625 | 1,230 | 3,548 | |
| 1956 | R | 815 | 1,515 | 3,100 | |
| 1952 | R | 1,754 | 1,986 | 3,740 | |
| 1948 | D | 421 | 191 | 2,977 | |
| 1944 | D | 1,801 | 705 | 2,506 | |
| 1940 | D | 2,883 | 362 | 3,246 | |
| 1936 | D | 2,593 | 213 | 2,807 | |
| 1932 | D | 2,671 | 41 | 2,713 | |
| 1928 | D | 1,301 | 367 | 1,668 | |
| 1924 | D | 774 | 67 | 844 | |
| 1920 | D | 1,419 | 257 | 1,704 | |
| 1916 | D | 1,229 | 20 | 1,254 | |
| 1912 | D | 822 | 8 | 1,005 | |
| 1908 | D | 926 | 65 | 1,124 | |
| 1904 | D | 833 | 44 | 888 | |
| 1900 | D | 889 | 65 | 954 | |
| 1896 | D | 1,491 | 51 | 1,553 | |
| 1892 | D | 1,620 | 443 | 2,063 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Bienville Parish's population has contracted steadily for decades as the timber and oil-field economies shifted, leaving a sparse, older electorate that has drifted toward wide Republican margins in every recent presidential cycle.
The county's recent history is a story of close margins. The Democratic margin reached ninety-seven points in 1932; the Republican margin reached twenty-six points in 1972. Most other elections have been decided by single-digit points.
Bienville Parish's demographics — a population of 12,638, a 55% non-Hispanic-white share, a median household income of $35,011 — situate the county close to national averages on several dimensions. The county's voting pattern over the last decade is most similar to that of Wilkinson County and Mitchell County.