| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | D | 52,163 | 28,748 | 82,823 | |
| 2020 | D | 58,731 | 26,897 | 87,814 | |
| 2016 | D | 41,259 | 17,501 | 64,867 | |
| 2012 | D | 47,224 | 14,753 | 63,454 | |
| 2008 | D | 50,819 | 14,866 | 66,916 | |
| 2004 | D | 35,116 | 22,032 | 57,702 | |
| 2000 | D | 28,670 | 17,050 | 50,860 | |
| 1996 | D | 27,262 | 13,516 | 48,977 | |
| 1992 | D | 25,725 | 15,460 | 50,916 | |
| 1988 | D | 24,091 | 17,125 | 41,768 | |
| 1984 | R | 17,866 | 20,707 | 39,143 | |
| 1980 | D | 17,630 | 14,247 | 35,861 | |
| 1976 | D | 15,960 | 15,366 | 31,765 | |
| 1972 | R | 11,652 | 16,832 | 28,484 | |
| 1968 | D | 15,819 | 9,625 | 25,727 | |
| 1964 | D | 20,011 | 4,962 | 24,973 | |
| 1960 | R | 11,557 | 12,251 | 23,808 | |
| 1956 | — | — | — | — | |
| 1952 | — | — | — | — | |
| 1948 | — | — | — | — | |
| 1944 | — | — | — | — | |
| 1940 | — | — | — | — | |
| 1936 | — | — | — | — | |
| 1932 | — | — | — | — | |
| 1928 | — | — | — | — | |
| 1924 | — | — | — | — | |
| 1920 | — | — | — | — | |
| 1916 | — | — | — | — | |
| 1912 | — | — | — | — | |
| 1908 | — | — | — | — | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Spanning the entire island of Hawaiʻi, this county blends rural plantation-era communities with a growing retiree population, yet its presidential margins have remained consistently lopsided toward Democrats by double digits for over two decades.
The Democratic margin in Hawaii County peaked at sixty points in 1964. By 1988 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. Hawaii County's median household income of $78,639 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 Maui County and Glacier County.