| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 2,996 | 16,576 | 19,840 | |
| 2020 | R | 3,195 | 16,412 | 19,921 | |
| 2016 | R | 2,922 | 14,961 | 19,161 | |
| 2012 | R | 4,318 | 13,721 | 18,612 | |
| 2008 | R | 5,281 | 13,072 | 18,680 | |
| 2004 | R | 4,392 | 14,370 | 18,849 | |
| 2000 | R | 4,063 | 12,837 | 17,344 | |
| 1996 | R | 4,972 | 9,294 | 16,158 | |
| 1992 | R | 3,962 | 9,338 | 17,004 | |
| 1988 | R | 4,004 | 11,183 | 15,301 | |
| 1984 | R | 3,194 | 11,936 | 15,251 | |
| 1980 | R | 3,742 | 9,752 | 14,193 | |
| 1976 | R | 5,035 | 7,332 | 12,710 | |
| 1972 | R | 3,729 | 8,185 | 12,342 | |
| 1968 | R | 3,530 | 7,188 | 12,105 | |
| 1964 | D | 7,014 | 5,221 | 12,235 | |
| 1960 | R | 6,039 | 6,834 | 12,873 | |
| 1956 | R | 3,538 | 8,408 | 11,946 | |
| 1952 | R | 3,799 | 8,398 | 12,197 | |
| 1948 | D | 5,114 | 5,006 | 10,148 | |
| 1944 | R | 3,145 | 8,004 | 11,149 | |
| 1940 | R | 3,655 | 8,946 | 12,601 | |
| 1936 | D | 5,786 | 4,151 | 12,517 | |
| 1932 | D | 8,078 | 3,646 | 11,879 | |
| 1928 | D | 5,667 | 5,537 | 11,254 | |
| 1924 | D | 4,795 | 4,377 | 10,465 | |
| 1920 | R | 4,673 | 5,157 | 9,899 | |
| 1916 | D | 4,294 | 2,243 | 6,628 | |
| 1912 | D | 4,000 | 1,000 | 6,410 | |
| 1908 | D | 4,836 | 2,483 | 7,485 | |
| 1904 | D | 4,145 | 2,853 | 7,226 | |
| 1900 | D | 4,943 | 2,817 | 7,848 | |
| 1896 | D | 5,303 | 2,728 | 8,099 | |
| 1892 | D | 4,177 | 2,314 | 6,860 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Putnam County's R+68.7 margin in 2024 places it among the most one-sided counties in the state, a pattern rooted in its densely rural, heavily German-Catholic agricultural communities along the Auglaize River corridor.
The Republican margin in Putnam County reached its widest at sixty-eight points in 2024. The margin in 2024 was sixty-eight points, in line with the county's deep historical pattern.
Putnam County's loyalty is rooted in its place. Median household income of $84,928, a 92% non-Hispanic-white share, and a population of 34,314 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 Grant County and Butler County.
