| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 47,128 | 91,132 | 140,759 | |
| 2020 | R | 46,069 | 87,988 | 136,100 | |
| 2016 | R | 33,730 | 77,643 | 119,450 | |
| 2012 | R | 32,909 | 76,564 | 111,760 | |
| 2008 | R | 33,398 | 71,691 | 106,426 | |
| 2004 | R | 26,044 | 68,037 | 94,422 | |
| 2000 | R | 19,142 | 48,318 | 69,078 | |
| 1996 | R | 17,089 | 33,210 | 55,409 | |
| 1992 | R | 13,542 | 27,998 | 52,802 | |
| 1988 | R | 11,145 | 31,419 | 42,818 | |
| 1984 | R | 9,031 | 29,848 | 39,070 | |
| 1980 | R | 11,306 | 22,430 | 35,522 | |
| 1976 | R | 13,349 | 16,115 | 29,935 | |
| 1972 | R | 6,941 | 20,210 | 27,897 | |
| 1968 | R | 6,756 | 12,663 | 26,014 | |
| 1964 | D | 12,406 | 10,982 | 23,388 | |
| 1960 | R | 7,945 | 14,505 | 22,450 | |
| 1956 | R | 7,193 | 13,673 | 20,866 | |
| 1952 | R | 7,054 | 11,529 | 18,583 | |
| 1948 | R | 5,793 | 7,584 | 13,409 | |
| 1944 | R | 5,765 | 8,598 | 14,363 | |
| 1940 | R | 6,895 | 8,722 | 15,617 | |
| 1936 | R | 7,209 | 7,359 | 14,707 | |
| 1932 | R | 5,547 | 7,421 | 13,165 | |
| 1928 | R | 2,455 | 8,708 | 11,219 | |
| 1924 | R | 2,406 | 6,729 | 9,749 | |
| 1920 | R | 3,956 | 7,464 | 11,491 | |
| 1916 | R | 2,937 | 3,610 | 6,642 | |
| 1912 | R | 2,101 | 2,788 | 6,267 | |
| 1908 | R | 2,656 | 4,233 | 6,996 | |
| 1904 | R | 2,012 | 4,381 | 6,528 | |
| 1900 | R | 2,675 | 4,311 | 7,115 | |
| 1896 | R | 2,794 | 4,379 | 7,234 | |
| 1892 | R | 2,400 | 3,807 | 6,453 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Anchored by fast-growing communities like Mason and Lebanon, Warren County has delivered double-digit Republican presidential margins for decades, making it a benchmark for measuring GOP strength in southwest Ohio's outer-ring suburbs.
The Republican margin in Warren County reached its widest at fifty-six points in 1928. The margin in 2024 was thirty-one points, in line with the county's deep historical pattern.
Warren County's loyalty is rooted in its place. Median household income of $110,132, a 83% non-Hispanic-white share, and a population of 250,008 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 Okaloosa County and Clay County.
