| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 36,867 | 62,273 | 102,651 | |
| 2020 | R | 36,456 | 60,218 | 100,327 | |
| 2016 | R | 26,567 | 58,215 | 90,129 | |
| 2012 | R | 27,939 | 56,761 | 87,536 | |
| 2008 | R | 28,060 | 54,503 | 84,760 | |
| 2004 | R | 22,974 | 55,275 | 79,349 | |
| 2000 | R | 20,146 | 41,742 | 64,027 | |
| 1996 | R | 17,122 | 30,316 | 52,997 | |
| 1992 | R | 15,447 | 28,405 | 54,930 | |
| 1988 | R | 12,368 | 31,224 | 43,747 | |
| 1984 | R | 8,898 | 27,230 | 36,199 | |
| 1980 | R | 10,393 | 19,859 | 32,940 | |
| 1976 | R | 9,940 | 15,661 | 25,601 | |
| 1972 | R | 4,408 | 16,847 | 21,808 | |
| 1968 | R | 4,658 | 11,888 | 19,631 | |
| 1964 | D | 8,451 | 8,332 | 16,783 | |
| 1960 | R | 5,763 | 11,445 | 17,208 | |
| 1956 | R | 4,423 | 11,749 | 16,172 | |
| 1952 | R | 4,934 | 11,563 | 16,522 | |
| 1948 | R | 4,226 | 8,003 | 12,333 | |
| 1944 | R | 4,483 | 8,999 | 13,482 | |
| 1940 | R | 5,833 | 8,300 | 14,178 | |
| 1936 | R | 6,496 | 7,383 | 13,957 | |
| 1932 | D | 6,482 | 5,732 | 12,306 | |
| 1928 | R | 3,731 | 8,644 | 12,419 | |
| 1924 | R | 4,616 | 5,301 | 10,263 | |
| 1920 | R | 4,273 | 5,784 | 10,125 | |
| 1916 | D | 4,016 | 3,602 | 7,774 | |
| 1912 | D | 7,217 | 2,546 | 7,216 | |
| 1908 | D | 7,027 | 3,641 | 170 | |
| 1904 | D | 8,340 | 3,357 | 143 | |
| 1900 | R | 4,022 | 4,103 | 26 | |
| 1896 | R | 3,841 | 4,047 | 8,140 | |
| 1892 | D | 3,721 | 3,328 | 7,274 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Carroll sits in north-central Maryland where exurban growth has reinforced rather than diluted a longstanding conservative lean, delivering Republican presidential candidates roughly 60 percent or better for more than two decades despite the state's Democratic tilt.
The Republican margin in Carroll County reached its widest at 100 points in 1900. The margin in 2024 was twenty-five points, in line with the county's deep historical pattern.
Carroll County's loyalty is rooted in its place. Median household income of $118,211, a 86% non-Hispanic-white share, and a population of 175,321 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 Warren County and Okaloosa County.