| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 24,734 | 48,282 | 73,986 | |
| 2020 | R | 23,932 | 46,731 | 71,652 | |
| 2016 | R | 18,953 | 40,525 | 62,503 | |
| 2012 | R | 19,900 | 35,872 | 56,777 | |
| 2008 | R | 23,310 | 34,314 | 58,297 | |
| 2004 | R | 18,109 | 37,089 | 55,665 | |
| 2000 | R | 16,093 | 28,534 | 45,897 | |
| 1996 | R | 14,187 | 21,885 | 40,735 | |
| 1992 | R | 12,350 | 21,512 | 43,021 | |
| 1988 | R | 11,912 | 24,415 | 36,608 | |
| 1984 | R | 10,520 | 27,008 | 37,716 | |
| 1980 | R | 8,281 | 24,495 | 35,507 | |
| 1976 | R | 11,785 | 20,880 | 33,330 | |
| 1972 | R | 6,683 | 25,008 | 32,320 | |
| 1968 | R | 9,529 | 21,832 | 34,025 | |
| 1964 | R | 15,882 | 17,891 | 33,845 | |
| 1960 | R | 11,761 | 25,525 | 37,353 | |
| 1956 | R | 10,406 | 22,556 | 33,003 | |
| 1952 | R | 11,611 | 20,726 | 32,472 | |
| 1948 | R | 9,418 | 15,553 | 25,241 | |
| 1944 | R | 11,818 | 15,206 | 27,153 | |
| 1940 | R | 13,315 | 13,449 | 26,857 | |
| 1936 | D | 13,800 | 13,213 | 27,476 | |
| 1932 | R | 5,924 | 10,487 | 17,784 | |
| 1928 | R | 3,278 | 16,841 | 20,464 | |
| 1924 | R | 2,464 | 9,494 | 12,783 | |
| 1920 | R | 3,016 | 8,778 | 12,402 | |
| 1916 | R | 3,821 | 5,876 | 10,228 | |
| 1912 | D | 2,972 | 2,378 | 10,580 | |
| 1908 | R | 2,858 | 6,874 | 10,247 | |
| 1904 | R | 2,449 | 6,938 | 9,884 | |
| 1900 | R | 3,050 | 7,089 | 10,618 | |
| 1896 | R | 2,819 | 7,288 | 10,323 | |
| 1892 | R | 3,409 | 5,403 | 9,141 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Lebanon County's mix of small-city manufacturing heritage and surrounding agricultural townships has produced Republican presidential margins exceeding 30 points in recent cycles, making it an outlier even within a competitive swing state.
The Republican margin in Lebanon County reached its widest at sixty-six points in 1928. The margin in 2024 was thirty-two points, in line with the county's deep historical pattern.
Lebanon County's loyalty is rooted in its place. Median household income of $78,425, a 81% non-Hispanic-white share, and a population of 144,186 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 Huntington County and Shenandoah County.