| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 17,464 | 34,264 | 52,926 | |
| 2020 | R | 18,083 | 32,874 | 52,294 | |
| 2016 | R | 12,865 | 27,946 | 46,110 | |
| 2012 | R | 15,855 | 28,849 | 46,237 | |
| 2008 | R | 18,028 | 27,869 | 46,511 | |
| 2004 | R | 14,843 | 29,525 | 45,006 | |
| 2000 | R | 11,980 | 21,434 | 34,657 | |
| 1996 | R | 12,070 | 17,478 | 32,553 | |
| 1992 | R | 11,302 | 13,415 | 30,281 | |
| 1988 | R | 11,094 | 16,202 | 27,750 | |
| 1984 | R | 8,963 | 18,690 | 27,910 | |
| 1980 | R | 6,705 | 15,579 | 23,499 | |
| 1976 | R | 8,615 | 10,852 | 19,683 | |
| 1972 | R | 4,296 | 10,788 | 15,970 | |
| 1968 | R | 4,036 | 7,664 | 14,185 | |
| 1964 | D | 6,901 | 6,808 | 13,892 | |
| 1960 | R | 5,370 | 7,521 | 13,185 | |
| 1956 | R | 2,425 | 5,194 | 7,690 | |
| 1952 | R | 1,659 | 3,864 | 5,541 | |
| 1948 | R | 1,544 | 2,407 | 3,965 | |
| 1944 | R | 1,093 | 1,438 | 2,540 | |
| 1940 | R | 1,445 | 1,757 | 3,207 | |
| 1936 | D | 1,530 | 1,345 | 2,944 | |
| 1932 | D | 1,506 | 925 | 2,635 | |
| 1928 | R | 724 | 1,436 | 2,164 | |
| 1924 | R | 819 | 889 | 1,981 | |
| 1920 | R | 831 | 985 | 1,845 | |
| 1916 | D | 637 | 385 | 1,068 | |
| 1912 | D | 493 | 203 | 1,066 | |
| 1908 | — | — | — | — | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
San Juan County anchors New Mexico's northwest corner with an economy historically tied to oil, gas, and coal extraction. Its 2024 presidential margin of R+31.7 makes it among the state's most consistent right-leaning counties despite the Democratic tilt of New Mexico overall.
The Republican margin in San Juan County reached its widest at forty-one points in 1972. The margin in 2024 was thirty-two points, in line with the county's deep historical pattern.
San Juan County's loyalty is rooted in its place. Median household income of $55,872, a 40% non-Hispanic-white share, and a population of 120,942 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 Shasta County and Twin Falls County.
