| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 22,296 | 35,936 | 59,135 | |
| 2020 | R | 23,732 | 35,557 | 60,665 | |
| 2016 | R | 17,450 | 28,092 | 50,015 | |
| 2012 | R | 18,546 | 29,497 | 49,201 | |
| 2008 | R | 18,943 | 29,026 | 48,820 | |
| 2004 | R | 17,514 | 26,556 | 44,595 | |
| 2000 | R | 13,360 | 18,180 | 33,241 | |
| 1996 | R | 13,782 | 14,365 | 31,923 | |
| 1992 | D | 12,701 | 12,202 | 33,150 | |
| 1988 | R | 11,812 | 15,815 | 28,050 | |
| 1984 | R | 9,671 | 16,405 | 26,355 | |
| 1980 | R | 7,028 | 13,351 | 22,445 | |
| 1976 | R | 9,281 | 9,921 | 19,883 | |
| 1972 | R | 6,023 | 11,706 | 18,299 | |
| 1968 | R | 6,597 | 7,619 | 16,711 | |
| 1964 | D | 9,045 | 7,644 | 16,697 | |
| 1960 | R | 7,419 | 7,572 | 15,007 | |
| 1956 | R | 5,328 | 6,893 | 12,230 | |
| 1952 | R | 5,640 | 6,495 | 12,135 | |
| 1948 | D | 6,198 | 3,854 | 10,370 | |
| 1944 | D | 6,935 | 3,371 | 10,319 | |
| 1940 | D | 8,748 | 3,170 | 11,950 | |
| 1936 | D | 8,130 | 2,092 | 10,499 | |
| 1932 | D | 7,798 | 2,838 | 11,216 | |
| 1928 | R | 4,262 | 5,776 | 10,083 | |
| 1924 | R | 3,496 | 3,712 | 9,699 | |
| 1920 | R | 4,430 | 5,341 | 9,771 | |
| 1916 | D | 6,115 | 3,203 | 10,132 | |
| 1912 | D | 1,973 | 403 | 4,619 | |
| 1908 | — | — | — | — | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Home to Fort Huachuca and roughly 83 miles of international border, Cochise County combines a significant active-duty and veteran population with rural ranching communities, producing consistent double-digit Republican margins in federal races.
The Democratic margin in Cochise County peaked at fifty-eight points in 1936. By 1996 the county had flipped, voting Republican for the first time in many years. The 2024 margin was twenty-three points, the most Republican-leaning result in the county's modern history.
The economic context is the key. Cochise County's median household income of $59,742 sits well below state and national norms, and 15% 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 Lumpkin County and Pickens County.