| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 39,758 | 55,983 | 97,096 | |
| 2020 | R | 44,519 | 55,194 | 101,001 | |
| 2016 | R | 43,014 | 49,024 | 97,700 | |
| 2012 | D | 61,672 | 38,279 | 102,723 | |
| 2008 | D | 64,145 | 40,164 | 107,271 | |
| 2004 | D | 66,673 | 40,977 | 108,145 | |
| 2000 | D | 57,643 | 34,654 | 96,239 | |
| 1996 | D | 55,604 | 24,811 | 94,745 | |
| 1992 | D | 54,591 | 25,831 | 107,606 | |
| 1988 | D | 58,674 | 38,815 | 98,250 | |
| 1984 | D | 56,902 | 45,623 | 103,259 | |
| 1980 | D | 44,366 | 41,056 | 93,002 | |
| 1976 | D | 53,828 | 36,469 | 92,544 | |
| 1972 | R | 35,278 | 47,680 | 85,266 | |
| 1968 | D | 40,365 | 33,076 | 82,760 | |
| 1964 | D | 54,342 | 27,059 | 81,401 | |
| 1960 | D | 46,928 | 40,724 | 87,652 | |
| 1956 | R | 32,913 | 43,936 | 76,849 | |
| 1952 | D | 39,062 | 37,793 | 76,855 | |
| 1948 | D | 37,097 | 25,297 | 63,392 | |
| 1944 | D | 34,312 | 25,150 | 59,462 | |
| 1940 | D | 34,615 | 25,026 | 59,641 | |
| 1936 | D | 32,384 | 16,887 | 50,329 | |
| 1932 | R | 17,871 | 23,029 | 42,913 | |
| 1928 | R | 9,110 | 29,710 | 39,194 | |
| 1924 | R | 4,007 | 22,341 | 30,049 | |
| 1920 | R | 6,815 | 17,343 | 25,259 | |
| 1916 | R | 6,091 | 6,167 | 13,080 | |
| 1912 | D | 3,347 | 2,633 | 11,375 | |
| 1908 | R | 4,476 | 6,978 | 12,031 | |
| 1904 | R | 2,110 | 7,383 | 10,799 | |
| 1900 | R | 3,686 | 7,723 | 11,753 | |
| 1896 | R | 3,829 | 7,867 | 11,878 | |
| 1892 | R | 3,217 | 5,819 | 9,788 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Trumbull County in northeast Ohio's Mahoning Valley has swung more than 40 points toward Republicans over the past two decades, making it one of the most dramatic realignment stories among Rust Belt counties with a strong union-manufacturing heritage.
The Democratic margin in Trumbull County has rarely exceeded thirty-four points in modern history; the Republican margin has rarely exceeded sixty-one points. 2024 delivered the county to the Republican candidate by seventeen points.
Trumbull County's demographics resemble the country more than they resemble most counties. A 85% non-Hispanic-white share, a 17% poverty rate, and a median household income of $56,435 — all within the broad national range. The county's voting pattern over the last decade is most similar to that of Des Moines County and Mower County.
