| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 4,059 | 8,267 | 12,484 | |
| 2020 | R | 3,976 | 7,927 | 12,095 | |
| 2016 | R | 3,627 | 6,618 | 10,767 | |
| 2012 | R | 5,153 | 5,747 | 11,037 | |
| 2008 | D | 5,902 | 4,711 | 10,787 | |
| 2004 | R | 5,175 | 5,970 | 11,273 | |
| 2000 | R | 4,670 | 4,883 | 10,084 | |
| 1996 | D | 4,311 | 3,431 | 9,046 | |
| 1992 | D | 4,050 | 3,570 | 10,377 | |
| 1988 | D | 4,786 | 4,330 | 9,179 | |
| 1984 | R | 3,444 | 5,705 | 9,210 | |
| 1980 | R | 3,706 | 5,577 | 9,775 | |
| 1976 | D | 4,607 | 4,447 | 9,279 | |
| 1972 | R | 3,360 | 4,802 | 8,403 | |
| 1968 | R | 2,622 | 4,467 | 7,802 | |
| 1964 | D | 4,792 | 2,980 | 7,780 | |
| 1960 | D | 4,256 | 3,950 | 8,213 | |
| 1956 | R | 2,364 | 5,106 | 7,509 | |
| 1952 | R | 1,972 | 6,482 | 8,482 | |
| 1948 | R | 2,746 | 3,646 | 6,478 | |
| 1944 | R | 2,611 | 4,153 | 6,780 | |
| 1940 | R | 3,389 | 3,862 | 7,272 | |
| 1936 | D | 4,971 | 1,527 | 6,717 | |
| 1932 | D | 5,200 | 879 | 6,122 | |
| 1928 | D | 3,988 | 1,556 | 5,569 | |
| 1924 | R | 395 | 1,018 | 4,260 | |
| 1920 | R | 598 | 2,622 | 3,326 | |
| 1916 | D | 2,011 | 1,104 | 3,148 | |
| 1912 | D | 1,696 | 1,115 | 3,122 | |
| 1908 | D | 1,731 | 1,590 | 3,421 | |
| 1904 | R | 1,457 | 1,578 | 3,174 | |
| 1900 | R | 1,729 | 1,750 | 3,513 | |
| 1896 | R | 1,649 | 1,835 | 3,590 | |
| 1892 | D | 2,046 | 518 | 2,595 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Kewaunee's roughly 20,000 residents are concentrated in small farming and fishing communities along Lake Michigan, and the county has shifted dramatically toward Republicans over the past decade, posting a 33-point margin in 2024.
The Republican margin in Kewaunee County reached its widest at sixty-one points in 1920. The margin in 2024 was thirty-four points, in line with the county's deep historical pattern.
Kewaunee County's loyalty is rooted in its place. Median household income of $82,725, a 93% non-Hispanic-white share, and a population of 20,664 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 Barron County and Clark County.
