| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 3,871 | 12,566 | 16,766 | |
| 2020 | R | 3,946 | 12,278 | 16,597 | |
| 2016 | R | 3,356 | 10,637 | 14,818 | |
| 2012 | R | 4,507 | 9,005 | 13,829 | |
| 2008 | R | 6,334 | 8,086 | 14,646 | |
| 2004 | R | 4,103 | 8,908 | 13,136 | |
| 2000 | R | 4,123 | 7,352 | 11,871 | |
| 1996 | R | 3,962 | 5,958 | 11,616 | |
| 1992 | R | 3,487 | 5,341 | 12,048 | |
| 1988 | R | 3,850 | 7,119 | 11,021 | |
| 1984 | R | 3,392 | 7,820 | 11,272 | |
| 1980 | R | 3,996 | 7,090 | 11,748 | |
| 1976 | R | 5,116 | 6,063 | 11,297 | |
| 1972 | R | 3,339 | 7,879 | 11,243 | |
| 1968 | R | 3,692 | 5,873 | 11,410 | |
| 1964 | D | 6,275 | 5,331 | 11,630 | |
| 1960 | R | 4,798 | 6,583 | 11,423 | |
| 1956 | R | 4,572 | 6,684 | 11,280 | |
| 1952 | R | 4,446 | 6,632 | 11,118 | |
| 1948 | R | 4,814 | 5,072 | 9,963 | |
| 1944 | R | 4,857 | 5,386 | 10,283 | |
| 1940 | D | 6,020 | 5,832 | 11,901 | |
| 1936 | D | 6,177 | 4,961 | 11,207 | |
| 1932 | D | 6,168 | 4,438 | 10,968 | |
| 1928 | R | 4,177 | 5,351 | 9,603 | |
| 1924 | R | 4,759 | 4,930 | 10,032 | |
| 1920 | D | 5,417 | 5,140 | 10,746 | |
| 1916 | D | 2,965 | 2,453 | 5,668 | |
| 1912 | D | 2,922 | 1,354 | 5,545 | |
| 1908 | D | 3,131 | 2,626 | 5,926 | |
| 1904 | D | 3,005 | 2,586 | 5,830 | |
| 1900 | D | 3,251 | 2,632 | 6,049 | |
| 1896 | D | 3,218 | 2,622 | 5,909 | |
| 1892 | D | 2,754 | 2,289 | 5,405 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Putnam County, anchored by Greencastle and DePauw University, still posts some of the widest Republican presidential margins in the state despite hosting a liberal-arts campus — a pattern common to small Indiana counties where rural precincts dominate the overall tally.
The Republican margin in Putnam County reached its widest at fifty-two points in 2024. The margin in 2024 was fifty-two points, in line with the county's deep historical pattern.
Putnam County's loyalty is rooted in its place. Median household income of $78,378, a 91% non-Hispanic-white share, and a population of 37,280 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 Carroll County and DeKalb County.
