| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 1,747 | 6,217 | 8,115 | |
| 2020 | R | 1,926 | 6,361 | 8,461 | |
| 2016 | R | 1,889 | 5,697 | 8,022 | |
| 2012 | R | 3,063 | 4,645 | 7,901 | |
| 2008 | R | 3,748 | 4,401 | 8,315 | |
| 2004 | R | 2,740 | 5,427 | 8,232 | |
| 2000 | R | 3,167 | 4,687 | 8,030 | |
| 1996 | R | 3,356 | 3,584 | 8,017 | |
| 1992 | R | 3,208 | 3,609 | 8,836 | |
| 1988 | R | 3,212 | 5,363 | 8,620 | |
| 1984 | R | 3,174 | 5,975 | 9,207 | |
| 1980 | R | 3,256 | 5,351 | 9,217 | |
| 1976 | R | 4,124 | 4,606 | 8,817 | |
| 1972 | R | 3,349 | 6,090 | 9,484 | |
| 1968 | R | 4,290 | 5,460 | 10,705 | |
| 1964 | D | 6,781 | 4,439 | 11,318 | |
| 1960 | R | 4,899 | 6,519 | 11,492 | |
| 1956 | R | 4,571 | 6,767 | 11,454 | |
| 1952 | R | 4,764 | 7,270 | 12,331 | |
| 1948 | R | 5,520 | 5,635 | 11,442 | |
| 1944 | R | 5,166 | 6,207 | 11,629 | |
| 1940 | D | 6,554 | 6,478 | 13,149 | |
| 1936 | D | 6,535 | 5,233 | 11,967 | |
| 1932 | D | 6,693 | 5,018 | 11,711 | |
| 1928 | R | 4,759 | 5,998 | 10,844 | |
| 1924 | R | 4,812 | 5,753 | 10,890 | |
| 1920 | R | 4,759 | 6,089 | 11,414 | |
| 1916 | R | 3,070 | 3,075 | 6,615 | |
| 1912 | D | 2,786 | 1,282 | 6,290 | |
| 1908 | D | 3,370 | 3,256 | 7,117 | |
| 1904 | R | 2,702 | 3,612 | 6,975 | |
| 1900 | R | 3,422 | 3,518 | 7,194 | |
| 1896 | D | 3,680 | 3,473 | 7,287 | |
| 1892 | R | 2,359 | 2,414 | 5,778 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Jay County's R+55.2 margin in 2024 places it among Indiana's most heavily one-sided counties, reflecting the rural, small-manufacturing demographic pattern common to the eastern part of the state.
The Democratic margin in Jay County peaked at twenty-four points in 1912. By 1968 the county had flipped, voting Republican for the first time in many years. The 2024 margin was fifty-five points, the most Republican-leaning result in the county's modern history.
The economic context is the key. Jay County's median household income of $54,969 sits well below state and national norms, and 14% of residents live below the federal poverty line. The shift here is part of a broader realignment of working-class places across the country. The county's voting pattern over the last decade is most similar to that of Randolph County and Stark County.