| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 18,848 | 26,067 | 45,881 | |
| 2020 | R | 20,474 | 26,827 | 48,191 | |
| 2016 | R | 18,100 | 24,217 | 45,410 | |
| 2012 | D | 22,654 | 21,251 | 45,074 | |
| 2008 | D | 28,384 | 20,916 | 49,863 | |
| 2004 | R | 20,436 | 27,064 | 47,939 | |
| 2000 | R | 20,876 | 22,105 | 44,147 | |
| 1996 | D | 20,385 | 18,126 | 44,863 | |
| 1992 | R | 19,556 | 20,473 | 50,721 | |
| 1988 | R | 20,548 | 27,348 | 48,112 | |
| 1984 | R | 19,791 | 30,092 | 50,171 | |
| 1980 | R | 20,923 | 28,342 | 52,647 | |
| 1976 | R | 25,151 | 26,417 | 52,087 | |
| 1972 | R | 17,936 | 32,468 | 50,567 | |
| 1968 | R | 19,532 | 23,554 | 49,523 | |
| 1964 | D | 28,469 | 20,022 | 48,678 | |
| 1960 | R | 23,266 | 26,167 | 49,610 | |
| 1956 | R | 20,818 | 24,792 | 45,827 | |
| 1952 | R | 18,733 | 24,272 | 43,590 | |
| 1948 | D | 17,060 | 15,662 | 33,525 | |
| 1944 | D | 18,780 | 17,340 | 36,575 | |
| 1940 | D | 20,836 | 17,616 | 38,691 | |
| 1936 | D | 19,048 | 14,207 | 33,527 | |
| 1932 | R | 14,346 | 16,012 | 31,245 | |
| 1928 | R | 8,532 | 19,102 | 27,770 | |
| 1924 | R | 7,830 | 14,411 | 23,340 | |
| 1920 | R | 8,329 | 14,845 | 24,030 | |
| 1916 | R | 5,946 | 6,919 | 13,771 | |
| 1912 | D | 4,313 | 2,018 | 12,278 | |
| 1908 | R | 5,725 | 7,014 | 13,676 | |
| 1904 | R | 3,673 | 8,522 | 13,450 | |
| 1900 | R | 4,647 | 8,301 | 13,430 | |
| 1896 | R | 4,253 | 7,340 | 11,784 | |
| 1892 | R | 2,862 | 4,908 | 8,307 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Delaware County anchors Muncie, once a classic Rust Belt Democratic stronghold studied in the famous 'Middletown' sociological surveys. The county has trended Republican over recent decades, reflecting broader realignment among non-college white voters in mid-sized Midwestern cities.
The Democratic margin in Delaware County has rarely exceeded nineteen points in modern history; the Republican margin has rarely exceeded thirty-eight points. 2024 delivered the county to the Republican candidate by sixteen points.
Delaware County's demographics resemble the country more than they resemble most counties. A 85% non-Hispanic-white share, a 20% poverty rate, and a median household income of $58,127 — all within the broad national range. The county's voting pattern over the last decade is most similar to that of Jo Daviess County and Houston County.
