| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 26,083 | 26,546 | 54,025 | |
| 2020 | D | 34,678 | 20,847 | 56,743 | |
| 2016 | D | 32,667 | 12,704 | 48,091 | |
| 2012 | D | 25,136 | 12,777 | 38,565 | |
| 2008 | D | 24,162 | 14,008 | 38,820 | |
| 2004 | D | 17,964 | 15,890 | 34,274 | |
| 2000 | D | 15,489 | 12,524 | 28,937 | |
| 1996 | D | 14,591 | 9,705 | 26,400 | |
| 1992 | D | 11,109 | 9,759 | 25,318 | |
| 1988 | R | 10,243 | 12,889 | 23,365 | |
| 1984 | R | 8,237 | 13,829 | 22,301 | |
| 1980 | R | 7,961 | 12,068 | 21,579 | |
| 1976 | R | 10,244 | 10,618 | 21,262 | |
| 1972 | R | 7,982 | 14,178 | 22,849 | |
| 1968 | R | 7,481 | 10,818 | 20,446 | |
| 1964 | D | 11,143 | 10,330 | 21,492 | |
| 1960 | R | 9,119 | 10,606 | 19,806 | |
| 1956 | R | 8,197 | 10,526 | 18,781 | |
| 1952 | R | 6,333 | 10,462 | 16,903 | |
| 1948 | R | 5,301 | 6,217 | 11,810 | |
| 1944 | R | 5,085 | 5,979 | 11,112 | |
| 1940 | D | 7,728 | 6,854 | 14,712 | |
| 1936 | D | 7,560 | 4,771 | 12,444 | |
| 1932 | D | 8,772 | 3,783 | 13,039 | |
| 1928 | R | 2,486 | 5,417 | 8,012 | |
| 1924 | R | 759 | 3,455 | 6,872 | |
| 1920 | R | 2,022 | 4,699 | 7,284 | |
| 1916 | D | 3,273 | 2,694 | 6,659 | |
| 1912 | D | 1,295 | 0 | 3,367 | |
| 1908 | R | 675 | 909 | 1,908 | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Imperial County sits along the U.S.-Mexico border with a majority-Latino electorate and an economy anchored by agriculture, yet its presidential margin has narrowed dramatically over the past decade, landing at R+0.9 in 2024.
The county's recent history is a story of close margins. The Democratic margin reached forty-two points in 2016; the Republican margin reached thirty-nine points in 1924. Most other elections have been decided by single-digit points.
Imperial County's demographics — a population of 180,202, a 20% non-Hispanic-white share, a median household income of $57,681 — situate the county close to national averages on several dimensions. The county's voting pattern over the last decade is most similar to that of Miami-Dade County and Passaic County.
