| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 4,562 | 15,036 | 19,783 | |
| 2020 | R | 4,678 | 14,578 | 19,493 | |
| 2016 | R | 4,273 | 12,576 | 17,660 | |
| 2012 | R | 5,056 | 10,828 | 16,270 | |
| 2008 | R | 6,756 | 10,737 | 17,766 | |
| 2004 | R | 6,049 | 11,063 | 17,184 | |
| 2000 | R | 5,605 | 9,796 | 15,849 | |
| 1996 | R | 5,954 | 6,916 | 15,071 | |
| 1992 | R | 5,584 | 6,477 | 15,718 | |
| 1988 | R | 5,616 | 8,026 | 13,751 | |
| 1984 | R | 5,407 | 9,836 | 15,304 | |
| 1980 | R | 5,472 | 8,812 | 15,101 | |
| 1976 | R | 6,585 | 8,360 | 15,210 | |
| 1972 | R | 4,509 | 10,073 | 14,821 | |
| 1968 | R | 5,341 | 8,077 | 14,423 | |
| 1964 | D | 9,235 | 6,143 | 15,389 | |
| 1960 | R | 5,506 | 10,307 | 15,847 | |
| 1956 | R | 4,955 | 10,048 | 15,011 | |
| 1952 | R | 5,212 | 9,340 | 14,649 | |
| 1948 | R | 4,984 | 6,866 | 11,850 | |
| 1944 | R | 5,263 | 8,098 | 13,460 | |
| 1940 | R | 6,564 | 9,035 | 15,643 | |
| 1936 | R | 8,412 | 8,477 | 17,189 | |
| 1932 | D | 6,651 | 5,991 | 13,015 | |
| 1928 | R | 3,746 | 9,183 | 13,038 | |
| 1924 | R | 3,642 | 5,913 | 10,698 | |
| 1920 | R | 3,487 | 4,615 | 8,662 | |
| 1916 | D | 3,269 | 2,595 | 6,318 | |
| 1912 | D | 3,079 | 916 | 6,262 | |
| 1908 | D | 3,291 | 2,915 | 6,791 | |
| 1904 | R | 2,466 | 2,978 | 5,845 | |
| 1900 | D | 3,472 | 3,002 | 6,718 | |
| 1896 | D | 4,097 | 3,338 | 7,662 | |
| 1892 | D | 3,746 | 2,543 | 6,482 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Clarion County, a rural stretch of the Allegheny Plateau, recorded an R+53.1 margin in 2024, placing it among Pennsylvania's most lopsided counties and reflecting the broader realignment of small-town Appalachian Pennsylvania over the past two decades.
The Democratic margin in Clarion County peaked at thirty-five points in 1912. By 1968 the county had flipped, voting Republican for the first time in many years. The 2024 margin was fifty-three points, the most Republican-leaning result in the county's modern history.
The economic context is the key. Clarion County's median household income of $62,649 sits well below state and national norms, and 13% 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 Hampshire County and Martin County.