| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 5,792 | 5,902 | 11,789 | |
| 2020 | D | 6,510 | 5,954 | 12,590 | |
| 2016 | D | 6,418 | 5,456 | 12,085 | |
| 2012 | D | 7,059 | 5,209 | 12,395 | |
| 2008 | D | 6,994 | 5,432 | 12,564 | |
| 2004 | D | 6,407 | 4,545 | 11,108 | |
| 2000 | D | 6,523 | 3,813 | 10,705 | |
| 1996 | D | 7,247 | 2,832 | 10,743 | |
| 1992 | D | 6,609 | 3,339 | 11,186 | |
| 1988 | D | 6,707 | 3,799 | 10,719 | |
| 1984 | D | 5,989 | 4,627 | 10,735 | |
| 1980 | D | 6,206 | 3,429 | 9,824 | |
| 1976 | D | 4,531 | 2,751 | 7,466 | |
| 1972 | R | 2,633 | 3,112 | 6,291 | |
| 1968 | D | 2,987 | 778 | 6,530 | |
| 1964 | R | 1,467 | 4,214 | 5,681 | |
| 1960 | D | 4,362 | 620 | 5,314 | |
| 1956 | R | 1,832 | 1,849 | 3,759 | |
| 1952 | D | 2,165 | 1,353 | 3,518 | |
| 1948 | D | 859 | 453 | 2,117 | |
| 1944 | D | 1,387 | 265 | 1,652 | |
| 1940 | D | 1,463 | 506 | 1,969 | |
| 1936 | D | 1,575 | 259 | 1,834 | |
| 1932 | D | 1,715 | 240 | 1,955 | |
| 1928 | D | 1,486 | 128 | 1,614 | |
| 1924 | D | 615 | 278 | 896 | |
| 1920 | R | 342 | 533 | 875 | |
| 1916 | D | 520 | 185 | 727 | |
| 1912 | D | 367 | 228 | 679 | |
| 1908 | D | 364 | 123 | 497 | |
| 1904 | D | 327 | 99 | 450 | |
| 1900 | R | 395 | 418 | 813 | |
| 1896 | R | 210 | 1,417 | 1,670 | |
| 1892 | R | 575 | 787 | 1,362 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
St. James Parish sits along the Mississippi River between Baton Rouge and New Orleans, with a population that is roughly 55% Black — making its near-even 2024 presidential split a notable data point for analysts tracking demographic voting patterns in the Deep South.
The county's recent history is a story of close margins. The Democratic margin reached eighty-four points in 1928; the Republican margin reached seventy-two points in 1896. Most other elections have been decided by single-digit points.
St. James Parish's demographics — a population of 19,528, a 50% non-Hispanic-white share, a median household income of $65,531 — 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 Iberville Parish and Marshall County.
