| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | D | 292,450 | 214,669 | 515,027 | |
| 2020 | D | 304,981 | 207,758 | 522,174 | |
| 2016 | D | 224,661 | 167,428 | 421,640 | |
| 2012 | D | 201,251 | 174,779 | 383,173 | |
| 2008 | D | 206,254 | 182,406 | 393,428 | |
| 2004 | D | 193,128 | 171,109 | 367,492 | |
| 2000 | D | 147,688 | 124,579 | 287,640 | |
| 1996 | D | 137,983 | 104,121 | 264,552 | |
| 1992 | D | 128,569 | 97,036 | 281,484 | |
| 1988 | R | 113,824 | 117,899 | 234,473 | |
| 1984 | R | 91,585 | 123,830 | 217,612 | |
| 1980 | R | 64,418 | 93,055 | 187,057 | |
| 1976 | R | 71,214 | 77,264 | 155,061 | |
| 1972 | R | 56,223 | 73,154 | 161,110 | |
| 1968 | R | 39,786 | 49,479 | 97,766 | |
| 1964 | D | 54,120 | 46,955 | 101,278 | |
| 1960 | R | 42,171 | 46,734 | 89,144 | |
| 1956 | R | 23,536 | 39,298 | 62,885 | |
| 1952 | R | 21,237 | 32,113 | 53,350 | |
| 1948 | D | 17,692 | 16,968 | 35,625 | |
| 1944 | D | 13,006 | 10,850 | 23,913 | |
| 1940 | D | 14,035 | 9,445 | 23,562 | |
| 1936 | D | 12,249 | 6,079 | 18,590 | |
| 1932 | D | 11,061 | 6,152 | 17,727 | |
| 1928 | R | 4,976 | 6,635 | 11,653 | |
| 1924 | R | 2,594 | 3,559 | 8,439 | |
| 1920 | R | 2,455 | 3,392 | 5,847 | |
| 1916 | R | 2,079 | 2,616 | 4,922 | |
| 1912 | D | 693 | 353 | 1,804 | |
| 1908 | — | — | — | — | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Home to the University of Arizona and a majority-minority population, Pima County has voted Democratic in every presidential race since 1996, with margins widening steadily as Tucson's metro core has grown relative to its rural fringe.
The Democratic margin in Pima County reached its widest at thirty-three points in 1936. The margin in 2024 was fifteen points — still decisive.
Pima County's loyalty is rooted in its place. Median household income of $70,315, a 59% non-Hispanic-white share, and a population of 1,060,490 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 Barnstable County and Davidson County.
