| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 6,212 | 14,345 | 20,792 | |
| 2020 | R | 6,066 | 14,237 | 20,650 | |
| 2016 | R | 5,145 | 12,477 | 18,606 | |
| 2012 | R | 6,995 | 10,010 | 17,299 | |
| 2008 | R | 8,537 | 9,685 | 18,517 | |
| 2004 | R | 8,044 | 10,999 | 19,273 | |
| 2000 | R | 7,537 | 9,290 | 17,552 | |
| 1996 | D | 7,291 | 7,056 | 17,067 | |
| 1992 | D | 6,972 | 6,585 | 18,426 | |
| 1988 | R | 6,790 | 8,991 | 15,995 | |
| 1984 | R | 6,244 | 10,838 | 17,221 | |
| 1980 | R | 5,560 | 9,165 | 15,974 | |
| 1976 | R | 7,412 | 8,508 | 16,170 | |
| 1972 | R | 4,877 | 10,018 | 15,167 | |
| 1968 | R | 6,368 | 8,889 | 15,968 | |
| 1964 | D | 10,598 | 5,965 | 16,657 | |
| 1960 | R | 6,525 | 11,611 | 18,195 | |
| 1956 | R | 4,463 | 12,145 | 16,651 | |
| 1952 | R | 4,442 | 11,555 | 16,150 | |
| 1948 | R | 4,103 | 8,378 | 12,814 | |
| 1944 | R | 4,440 | 9,276 | 13,853 | |
| 1940 | R | 5,825 | 11,016 | 16,942 | |
| 1936 | R | 8,495 | 9,440 | 18,767 | |
| 1932 | R | 5,254 | 7,872 | 13,753 | |
| 1928 | R | 2,835 | 12,077 | 15,056 | |
| 1924 | R | 2,161 | 8,502 | 11,986 | |
| 1920 | R | 2,180 | 7,791 | 11,974 | |
| 1916 | R | 2,628 | 3,413 | 7,141 | |
| 1912 | D | 1,686 | 1,564 | 7,258 | |
| 1908 | R | 2,054 | 4,672 | 7,532 | |
| 1904 | R | 1,222 | 4,737 | 6,908 | |
| 1900 | R | 2,500 | 5,609 | 8,645 | |
| 1896 | R | 3,048 | 4,846 | 8,255 | |
| 1892 | R | 2,735 | 3,838 | 7,394 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Warren County, anchored by the city of Warren along the Allegheny River, has shifted decisively rightward over the past decade. In 2024 it recorded an R+39.3 presidential margin, placing it among Pennsylvania's most lopsided counties.
The Democratic margin in Warren County peaked at twenty-eight points in 1964. By 2000 the county had flipped, voting Republican for the first time in many years. The 2024 margin was thirty-nine points, the most Republican-leaning result in the county's modern history.
The economic context is the key. Warren County's median household income of $60,480 sits well below state and national norms, and 11% 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 Marshall County and Clinton County.