| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 2,120 | 6,902 | 9,184 | |
| 2020 | R | 2,224 | 7,086 | 9,495 | |
| 2016 | R | 1,891 | 6,273 | 8,700 | |
| 2012 | R | 2,635 | 4,999 | 7,810 | |
| 2008 | R | 3,736 | 4,858 | 8,736 | |
| 2004 | R | 2,689 | 5,868 | 8,638 | |
| 2000 | R | 2,965 | 5,102 | 8,268 | |
| 1996 | R | 2,747 | 4,062 | 8,031 | |
| 1992 | R | 2,561 | 3,800 | 8,562 | |
| 1988 | R | 2,952 | 4,981 | 7,964 | |
| 1984 | R | 2,774 | 5,528 | 8,364 | |
| 1980 | R | 2,966 | 5,262 | 8,699 | |
| 1976 | R | 3,606 | 4,797 | 8,493 | |
| 1972 | R | 2,214 | 5,885 | 8,137 | |
| 1968 | R | 2,816 | 4,796 | 8,535 | |
| 1964 | D | 4,789 | 3,896 | 8,714 | |
| 1960 | R | 3,299 | 5,411 | 8,744 | |
| 1956 | R | 3,312 | 5,748 | 9,086 | |
| 1952 | R | 3,208 | 5,902 | 9,178 | |
| 1948 | R | 3,845 | 4,597 | 8,514 | |
| 1944 | R | 3,578 | 4,872 | 8,505 | |
| 1940 | R | 4,214 | 5,012 | 9,273 | |
| 1936 | D | 4,676 | 4,426 | 9,167 | |
| 1932 | D | 4,866 | 3,853 | 8,799 | |
| 1928 | R | 3,182 | 4,780 | 8,028 | |
| 1924 | R | 3,660 | 4,543 | 8,489 | |
| 1920 | R | 4,186 | 5,006 | 9,284 | |
| 1916 | R | 2,401 | 2,468 | 5,028 | |
| 1912 | D | 2,275 | 1,467 | 4,883 | |
| 1908 | D | 2,590 | 2,546 | 5,365 | |
| 1904 | R | 2,420 | 2,671 | 5,346 | |
| 1900 | D | 2,690 | 2,585 | 5,432 | |
| 1896 | D | 2,764 | 2,546 | 5,368 | |
| 1892 | D | 2,361 | 2,230 | 5,019 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Carroll County's R+52.1 margin in 2024 reflects a broader pattern of consolidation in small agricultural counties across the Midwest, where low population density and a predominantly white, non-college workforce have tracked closely with Republican performance gains over the past decade.
The Republican margin in Carroll County reached its widest at fifty-two points in 2024. The margin in 2024 was fifty-two points, in line with the county's deep historical pattern.
Carroll County's loyalty is rooted in its place. Median household income of $65,645, a 94% non-Hispanic-white share, and a population of 20,535 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 Putnam County and Clay County.