| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 19,265 | 21,084 | 41,452 | |
| 2020 | R | 20,282 | 20,803 | 42,079 | |
| 2016 | R | 14,699 | 18,432 | 36,772 | |
| 2012 | R | 13,826 | 16,831 | 31,591 | |
| 2008 | D | 17,060 | 15,775 | 33,377 | |
| 2004 | R | 16,313 | 17,670 | 34,306 | |
| 2000 | R | 12,603 | 13,595 | 27,367 | |
| 1996 | D | 13,406 | 10,189 | 26,820 | |
| 1992 | D | 14,142 | 9,831 | 28,623 | |
| 1988 | D | 14,178 | 12,091 | 26,338 | |
| 1984 | R | 13,236 | 14,972 | 28,274 | |
| 1980 | D | 12,883 | 11,972 | 27,826 | |
| 1976 | D | 16,163 | 11,827 | 27,990 | |
| 1972 | R | 10,721 | 16,758 | 27,479 | |
| 1968 | D | 13,128 | 9,261 | 23,945 | |
| 1964 | D | 17,358 | 6,473 | 23,831 | |
| 1960 | D | 13,103 | 11,523 | 24,626 | |
| 1956 | R | 11,016 | 14,046 | 25,062 | |
| 1952 | D | 13,152 | 13,111 | 26,263 | |
| 1948 | D | 12,138 | 9,329 | 21,683 | |
| 1944 | D | 10,429 | 9,647 | 20,076 | |
| 1940 | D | 12,940 | 10,367 | 23,307 | |
| 1936 | D | 13,677 | 8,811 | 22,582 | |
| 1932 | D | 10,319 | 8,417 | 19,221 | |
| 1928 | R | 6,182 | 11,364 | 17,734 | |
| 1924 | R | 4,977 | 6,994 | 14,110 | |
| 1920 | R | 3,442 | 6,773 | 10,584 | |
| 1916 | R | 2,227 | 3,412 | 5,936 | |
| 1912 | D | 1,673 | 1,216 | 5,241 | |
| 1908 | R | 1,758 | 3,131 | 5,250 | |
| 1904 | R | 1,596 | 3,188 | 4,927 | |
| 1900 | D | 2,978 | 1,577 | 4,642 | |
| 1896 | R | 1,482 | 2,684 | 4,216 | |
| 1892 | R | 1,505 | 2,255 | 3,822 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Home to West Virginia University, Monongalia is one of the state's most competitive counties, but even its college-town demographics couldn't hold off a 4.4-point Republican margin in 2024 as the broader state shifted decisively rightward.
The Democratic margin in Monongalia County has rarely exceeded forty-six points in modern history; the Republican margin has rarely exceeded thirty-two points. 2024 delivered the county to the Republican candidate by four points.
Monongalia County's demographics resemble the country more than they resemble most counties. A 87% non-Hispanic-white share, a 20% poverty rate, and a median household income of $65,346 — all within the broad national range. The county's voting pattern over the last decade is most similar to that of Wasco County and Anoka County.
