| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 2,600 | 5,082 | 7,840 | |
| 2020 | R | 2,748 | 5,105 | 8,037 | |
| 2016 | R | 2,447 | 4,434 | 7,445 | |
| 2012 | D | 3,665 | 3,555 | 7,406 | |
| 2008 | D | 3,965 | 3,596 | 7,674 | |
| 2004 | R | 3,537 | 4,534 | 8,135 | |
| 2000 | R | 3,113 | 3,835 | 7,177 | |
| 1996 | R | 2,926 | 3,029 | 6,799 | |
| 1992 | R | 2,854 | 3,297 | 7,679 | |
| 1988 | R | 2,990 | 4,464 | 7,512 | |
| 1984 | R | 2,398 | 5,237 | 7,658 | |
| 1980 | R | 2,154 | 5,084 | 8,023 | |
| 1976 | R | 3,372 | 5,059 | 8,526 | |
| 1972 | R | 2,571 | 6,041 | 8,631 | |
| 1968 | R | 2,558 | 5,275 | 8,282 | |
| 1964 | R | 4,062 | 4,487 | 8,549 | |
| 1960 | R | 3,097 | 6,282 | 9,418 | |
| 1956 | R | 2,693 | 6,503 | 9,211 | |
| 1952 | R | 2,584 | 6,978 | 9,576 | |
| 1948 | R | 2,809 | 5,318 | 8,189 | |
| 1944 | R | 2,843 | 6,101 | 8,962 | |
| 1940 | R | 3,592 | 6,398 | 10,013 | |
| 1936 | R | 4,368 | 4,886 | 9,328 | |
| 1932 | R | 3,812 | 4,571 | 8,495 | |
| 1928 | R | 1,876 | 6,197 | 8,118 | |
| 1924 | R | 603 | 4,559 | 7,482 | |
| 1920 | R | 606 | 5,194 | 5,994 | |
| 1916 | R | 1,980 | 4,496 | 6,707 | |
| 1912 | R | 1,098 | 1,577 | 4,111 | |
| 1908 | R | 1,129 | 2,875 | 4,310 | |
| 1904 | R | 691 | 3,128 | 4,092 | |
| 1900 | R | 1,266 | 3,425 | 4,788 | |
| 1896 | R | 1,480 | 3,314 | 4,880 | |
| 1892 | R | 1,444 | 2,456 | 4,177 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Carroll County's economy centers on agriculture and small manufacturing along the Mississippi River bluffs. Its Republican presidential margin has grown steadily over two decades, reflecting a broader rural realignment across the upper Midwest.
The Republican margin in Carroll County reached its widest at seventy-seven points in 1920. The margin in 2024 was thirty-two points, in line with the county's deep historical pattern.
Carroll County's loyalty is rooted in its place. Median household income of $60,758, a 90% non-Hispanic-white share, and a population of 15,576 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 Gratiot County and Sandusky County.