| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 15,572 | 21,861 | 37,560 | |
| 2020 | R | 16,636 | 21,922 | 39,410 | |
| 2016 | R | 13,757 | 20,097 | 36,119 | |
| 2012 | R | 16,797 | 17,612 | 35,010 | |
| 2008 | R | 18,888 | 19,364 | 38,695 | |
| 2004 | R | 17,080 | 21,321 | 39,075 | |
| 2000 | R | 17,424 | 18,779 | 37,710 | |
| 1996 | D | 16,977 | 14,287 | 35,813 | |
| 1992 | R | 15,099 | 16,088 | 39,135 | |
| 1988 | R | 15,966 | 20,951 | 37,139 | |
| 1984 | R | 14,638 | 24,909 | 39,647 | |
| 1980 | R | 14,565 | 19,674 | 37,209 | |
| 1976 | R | 17,207 | 20,640 | 38,026 | |
| 1972 | R | 12,650 | 26,200 | 38,944 | |
| 1968 | R | 15,820 | 20,693 | 39,553 | |
| 1964 | D | 26,332 | 14,716 | 41,082 | |
| 1960 | R | 17,899 | 26,469 | 44,396 | |
| 1956 | R | 11,592 | 33,270 | 44,862 | |
| 1952 | R | 13,729 | 30,188 | 44,022 | |
| 1948 | R | 13,352 | 22,754 | 36,919 | |
| 1944 | R | 15,064 | 22,198 | 37,359 | |
| 1940 | R | 15,203 | 22,156 | 37,499 | |
| 1936 | R | 15,542 | 20,515 | 36,195 | |
| 1932 | R | 13,825 | 20,152 | 34,750 | |
| 1928 | R | 12,189 | 25,029 | 37,354 | |
| 1924 | R | 7,162 | 18,599 | 28,765 | |
| 1920 | R | 7,060 | 17,864 | 26,068 | |
| 1916 | D | 7,461 | 6,409 | 14,704 | |
| 1912 | D | 6,008 | 3,317 | 12,985 | |
| 1908 | R | 5,966 | 7,410 | 13,952 | |
| 1904 | R | 5,641 | 7,282 | 13,664 | |
| 1900 | R | 6,531 | 6,921 | 13,997 | |
| 1896 | R | 5,259 | 7,926 | 13,586 | |
| 1892 | R | 4,661 | 5,410 | 11,175 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Anchored by Elmira, Chemung county once leaned Democratic on the strength of its industrial workforce but has moved toward Republican margins that now exceed 16 points, tracking a broader rural and post-industrial realignment across upstate New York.
The Republican margin in Chemung County reached its widest at forty-eight points in 1956. The margin in 2024 was seventeen points, in line with the county's deep historical pattern.
Chemung County's loyalty is rooted in its place. Median household income of $63,716, a 85% non-Hispanic-white share, and a population of 82,147 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 Steele County and Jefferson County.