| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 1,776 | 4,193 | 6,089 | |
| 2020 | R | 2,138 | 4,470 | 6,848 | |
| 2016 | R | 2,377 | 4,401 | 6,884 | |
| 2012 | R | 2,468 | 4,284 | 6,921 | |
| 2008 | R | 2,869 | 4,273 | 7,349 | |
| 2004 | D | 3,817 | 3,580 | 7,452 | |
| 2000 | D | 3,937 | 3,257 | 7,289 | |
| 1996 | D | 4,983 | 2,021 | 7,551 | |
| 1992 | D | 5,476 | 2,387 | 8,922 | |
| 1988 | R | 3,841 | 3,938 | 7,799 | |
| 1984 | R | 3,327 | 4,904 | 8,268 | |
| 1980 | D | 4,671 | 3,852 | 8,628 | |
| 1976 | D | 5,397 | 2,859 | 8,256 | |
| 1972 | R | 2,047 | 4,963 | 7,010 | |
| 1968 | D | 2,322 | 1,783 | 7,241 | |
| 1964 | D | 3,355 | 2,493 | 5,891 | |
| 1960 | D | 2,596 | 1,948 | 4,759 | |
| 1956 | D | 2,694 | 2,227 | 4,997 | |
| 1952 | D | 2,771 | 2,115 | 4,887 | |
| 1948 | D | 1,683 | 386 | 3,069 | |
| 1944 | D | 2,157 | 624 | 2,789 | |
| 1940 | D | 2,814 | 415 | 3,229 | |
| 1936 | D | 2,431 | 190 | 2,623 | |
| 1932 | D | 2,840 | 317 | 3,159 | |
| 1928 | D | 2,038 | 886 | 2,929 | |
| 1924 | D | 1,459 | 715 | 2,354 | |
| 1920 | D | 2,239 | 1,754 | 4,018 | |
| 1916 | D | 2,103 | 1,238 | 3,341 | |
| 1912 | D | 1,247 | 836 | 2,643 | |
| 1908 | D | 1,779 | 1,346 | 3,229 | |
| 1904 | R | 1,410 | 1,477 | 2,989 | |
| 1900 | D | 1,352 | 1,330 | 2,708 | |
| 1896 | D | 1,832 | 1,203 | 3,064 | |
| 1892 | D | 1,757 | 1,051 | 3,024 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Hempstead County's population has declined steadily over two decades, and its electorate has shifted sharply toward Republican presidential candidates, posting a nearly 40-point margin in 2024 — roughly double what it recorded fifteen years ago.
The unraveling was not abrupt. The Democratic margin in Hempstead County peaked at eighty-five points in 1936; it narrowed steadily over the late twentieth century. The 2008 election delivered the county to the Republican party for the first time in many years, by a margin of nineteen points. By 2024, the margin had settled into deep Republican territory.
The economic and demographic context is severe. Hempstead County's median household income of $46,787 is among the lowest of any county in the United States; 20% of residents live below the federal poverty line. The county's voting pattern over the last decade is most similar to that of Bradley County and Lafayette County.