| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | D | 10,903 | 10,843 | 22,076 | |
| 2020 | D | 10,851 | 10,169 | 21,406 | |
| 2016 | D | 9,122 | 8,693 | 18,985 | |
| 2012 | D | 11,206 | 7,857 | 19,322 | |
| 2008 | D | 11,502 | 6,730 | 18,534 | |
| 2004 | D | 9,575 | 8,497 | 18,248 | |
| 2000 | D | 7,863 | 6,790 | 15,276 | |
| 1996 | D | 6,136 | 4,697 | 12,616 | |
| 1992 | D | 5,467 | 4,887 | 14,183 | |
| 1988 | R | 5,153 | 6,636 | 11,908 | |
| 1984 | R | 4,367 | 7,827 | 12,296 | |
| 1980 | R | 5,336 | 7,714 | 14,277 | |
| 1976 | R | 5,632 | 7,085 | 13,046 | |
| 1972 | R | 3,634 | 7,422 | 11,222 | |
| 1968 | R | 3,501 | 6,502 | 10,654 | |
| 1964 | D | 5,548 | 5,364 | 10,929 | |
| 1960 | R | 3,766 | 7,939 | 11,711 | |
| 1956 | R | 3,614 | 7,114 | 10,779 | |
| 1952 | R | 3,326 | 7,949 | 11,281 | |
| 1948 | R | 3,881 | 4,403 | 8,398 | |
| 1944 | R | 4,101 | 5,556 | 9,699 | |
| 1940 | R | 4,565 | 5,711 | 10,364 | |
| 1936 | D | 5,941 | 3,700 | 9,859 | |
| 1932 | D | 5,406 | 3,190 | 8,758 | |
| 1928 | R | 2,812 | 5,152 | 8,027 | |
| 1924 | R | 423 | 2,922 | 8,331 | |
| 1920 | R | 633 | 5,466 | 6,455 | |
| 1916 | R | 1,687 | 2,422 | 4,343 | |
| 1912 | D | 1,716 | 1,601 | 4,124 | |
| 1908 | R | 1,856 | 2,617 | 4,804 | |
| 1904 | R | 1,466 | 2,992 | 4,822 | |
| 1900 | R | 1,776 | 2,996 | 4,976 | |
| 1896 | R | 2,339 | 3,093 | 5,652 | |
| 1892 | R | 2,052 | 2,329 | 5,058 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Green County sits in southwest Wisconsin's historic cheese-making belt, and its electorate has swung between parties by razor-thin margins in recent cycles, making it a reliable bellwether for statewide rural-to-small-town voter shifts.
The county's recent history is a story of close margins. The Democratic margin reached twenty-six points in 2008; the Republican margin reached seventy-five points in 1920. Most other elections have been decided by single-digit points.
Green County's demographics — a population of 37,017, a 93% non-Hispanic-white share, a median household income of $82,852 — 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 Sauk County and Rutland County.
