| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 4,851 | 18,372 | 23,584 | |
| 2020 | R | 5,556 | 19,237 | 25,135 | |
| 2016 | R | 4,704 | 17,404 | 23,197 | |
| 2012 | R | 5,432 | 15,450 | 21,313 | |
| 2008 | R | 7,450 | 13,246 | 21,022 | |
| 2004 | R | 9,178 | 13,057 | 22,379 | |
| 2000 | R | 8,347 | 10,206 | 18,875 | |
| 1996 | D | 8,721 | 7,768 | 18,700 | |
| 1992 | D | 9,511 | 7,888 | 20,290 | |
| 1988 | R | 10,152 | 10,221 | 20,430 | |
| 1984 | R | 9,164 | 13,910 | 23,155 | |
| 1980 | R | 11,804 | 12,273 | 24,741 | |
| 1976 | D | 14,761 | 10,791 | 25,552 | |
| 1972 | R | 7,826 | 17,846 | 25,672 | |
| 1968 | D | 12,739 | 9,985 | 26,087 | |
| 1964 | D | 18,298 | 8,905 | 27,203 | |
| 1960 | D | 17,289 | 11,719 | 29,008 | |
| 1956 | R | 13,236 | 14,648 | 27,884 | |
| 1952 | D | 16,694 | 14,267 | 30,961 | |
| 1948 | D | 15,201 | 10,065 | 25,348 | |
| 1944 | D | 14,861 | 10,034 | 24,895 | |
| 1940 | D | 18,163 | 11,395 | 29,558 | |
| 1936 | D | 18,391 | 10,762 | 29,183 | |
| 1932 | D | 15,900 | 11,088 | 27,093 | |
| 1928 | R | 10,273 | 12,887 | 23,210 | |
| 1924 | D | 10,058 | 9,159 | 21,370 | |
| 1920 | R | 7,981 | 8,613 | 16,650 | |
| 1916 | D | 4,836 | 4,788 | 9,679 | |
| 1912 | D | 3,497 | 1,507 | 8,120 | |
| 1908 | R | 3,006 | 4,229 | 7,296 | |
| 1904 | R | 2,327 | 3,640 | 6,052 | |
| 1900 | D | 2,699 | 2,112 | 4,841 | |
| 1896 | R | 2,123 | 2,388 | 4,528 | |
| 1892 | D | 1,827 | 1,651 | 3,549 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Mercer County, anchored by Bluefield in the state's southern coalfields, has moved from competitive terrain to a reliably wide Republican margin, reflecting the broader realignment of Appalachian working-class voters over the past generation.
The Republican margin in Mercer County reached its widest at fifty-seven points in 2024. The margin in 2024 was fifty-seven points, in line with the county's deep historical pattern.
Mercer County's loyalty is rooted in its place. Median household income of $53,210, a 89% non-Hispanic-white share, and a population of 58,563 together describe a community whose political habits are deeply settled. The county's voting pattern over the last decade is most similar to that of Tazewell County and Lawrence County.
