| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 580 | 1,141 | 1,761 | |
| 2020 | R | 586 | 1,141 | 1,777 | |
| 2016 | R | 536 | 1,025 | 1,717 | |
| 2012 | R | 767 | 865 | 1,678 | |
| 2008 | D | 907 | 800 | 1,752 | |
| 2004 | R | 778 | 1,107 | 1,922 | |
| 2000 | R | 687 | 1,031 | 1,840 | |
| 1996 | D | 827 | 745 | 1,799 | |
| 1992 | R | 841 | 864 | 2,206 | |
| 1988 | D | 1,151 | 1,078 | 2,243 | |
| 1984 | R | 1,026 | 1,445 | 2,513 | |
| 1980 | R | 726 | 1,611 | 2,595 | |
| 1976 | D | 1,610 | 1,336 | 3,015 | |
| 1972 | R | 1,358 | 1,625 | 3,028 | |
| 1968 | R | 1,477 | 1,526 | 3,162 | |
| 1964 | D | 2,186 | 1,101 | 3,287 | |
| 1960 | R | 1,783 | 1,934 | 3,719 | |
| 1956 | R | 1,794 | 1,821 | 3,617 | |
| 1952 | R | 1,418 | 2,443 | 3,880 | |
| 1948 | R | 1,629 | 1,672 | 3,538 | |
| 1944 | D | 1,925 | 1,506 | 3,441 | |
| 1940 | D | 2,435 | 1,859 | 4,316 | |
| 1936 | D | 2,954 | 1,002 | 4,491 | |
| 1932 | D | 3,176 | 956 | 4,132 | |
| 1928 | R | 1,542 | 2,364 | 3,928 | |
| 1924 | R | 175 | 1,697 | 3,449 | |
| 1920 | R | 501 | 3,127 | 3,701 | |
| 1916 | R | 861 | 1,013 | 1,987 | |
| 1912 | D | 526 | 448 | 1,701 | |
| 1908 | R | 616 | 1,225 | 1,920 | |
| 1904 | R | 340 | 1,284 | 1,721 | |
| 1900 | R | 576 | 994 | 1,623 | |
| 1896 | R | 603 | 616 | 1,221 | |
| 1892 | R | 0 | 460 | 998 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Nelson County's population has declined steadily for decades, leaving fewer than four residents per square mile across its rolling farmland. That rural depopulation pattern tracks closely with its consistent, wide Republican presidential margins.
The Republican margin in Nelson County reached its widest at seventy-one points in 1920. The margin in 2024 was thirty-two points, in line with the county's deep historical pattern.
Nelson County's loyalty is rooted in its place. Median household income of $67,193, a 93% non-Hispanic-white share, and a population of 3,016 together describe a community whose political habits are deeply settled. The county's voting pattern over the last decade is most similar to that of Polk County and Washington County.
