| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | D | 6,985 | 3,887 | 11,108 | |
| 2020 | D | 7,888 | 3,421 | 11,531 | |
| 2016 | D | 7,285 | 2,313 | 10,751 | |
| 2012 | D | 8,850 | 2,303 | 11,509 | |
| 2008 | D | 10,320 | 2,478 | 12,941 | |
| 2004 | D | 8,683 | 3,313 | 12,116 | |
| 2000 | D | 6,540 | 2,215 | 9,161 | |
| 1996 | D | 6,995 | 1,938 | 9,647 | |
| 1992 | D | 6,186 | 2,183 | 9,387 | |
| 1988 | D | 6,131 | 2,763 | 9,023 | |
| 1984 | D | 5,227 | 3,485 | 8,850 | |
| 1980 | D | 4,514 | 3,292 | 8,369 | |
| 1976 | D | 5,204 | 3,162 | 8,507 | |
| 1972 | D | 4,663 | 4,434 | 9,293 | |
| 1968 | D | 4,088 | 4,027 | 8,368 | |
| 1964 | D | 5,767 | 2,714 | 8,505 | |
| 1960 | D | 5,520 | 3,988 | 9,514 | |
| 1956 | R | 4,014 | 5,083 | 9,100 | |
| 1952 | R | 4,451 | 5,360 | 9,818 | |
| 1948 | D | 4,953 | 4,655 | 9,629 | |
| 1944 | D | 4,684 | 4,014 | 8,702 | |
| 1940 | D | 6,054 | 4,882 | 10,943 | |
| 1936 | D | 6,199 | 4,697 | 10,906 | |
| 1932 | R | 5,076 | 5,364 | 10,460 | |
| 1928 | R | 3,560 | 5,184 | 8,748 | |
| 1924 | R | 3,543 | 3,894 | 7,702 | |
| 1920 | R | 3,990 | 5,535 | 9,525 | |
| 1916 | R | 2,231 | 2,932 | 5,201 | |
| 1912 | R | 1,740 | 2,479 | 4,453 | |
| 1908 | — | — | — | — | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
San Miguel County, anchored by Las Vegas, N.M., combines a majority-Hispanic electorate with deep rural roots to produce presidential margins consistently exceeding D+25, making it an outlier among similarly sized rural counties nationwide.
The Democratic margin in San Miguel County peaked at sixty-one points in 2008. By 1960 the county had flipped, voting Republican for the first time in many years. The 2024 margin was twenty-eight points, the most Democratic-leaning result in the county's modern history.
The economic context is the key. San Miguel County's median household income of $49,431 sits well below state and national norms, and 24% 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 Fairfield County and Hancock County.