| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 625 | 3,809 | 4,480 | |
| 2020 | R | 641 | 3,616 | 4,351 | |
| 2016 | R | 479 | 3,060 | 3,620 | |
| 2012 | R | 591 | 2,918 | 3,552 | |
| 2008 | R | 863 | 2,876 | 3,778 | |
| 2004 | R | 845 | 2,856 | 3,730 | |
| 2000 | R | 878 | 2,447 | 3,376 | |
| 1996 | R | 1,200 | 1,493 | 3,031 | |
| 1992 | R | 1,100 | 1,232 | 3,259 | |
| 1988 | R | 1,355 | 1,718 | 3,086 | |
| 1984 | R | 1,130 | 2,118 | 3,258 | |
| 1980 | R | 1,526 | 1,683 | 3,267 | |
| 1976 | D | 1,981 | 1,176 | 3,189 | |
| 1972 | R | 685 | 1,931 | 2,617 | |
| 1968 | R | 1,116 | 1,266 | 2,834 | |
| 1964 | D | 2,048 | 1,006 | 3,056 | |
| 1960 | R | 1,136 | 1,592 | 2,737 | |
| 1956 | R | 1,124 | 1,709 | 2,843 | |
| 1952 | R | 1,313 | 2,130 | 3,448 | |
| 1948 | D | 1,725 | 478 | 2,339 | |
| 1944 | D | 1,790 | 344 | 2,499 | |
| 1940 | D | 2,263 | 655 | 2,922 | |
| 1936 | D | 1,929 | 202 | 2,132 | |
| 1932 | D | 2,474 | 164 | 2,642 | |
| 1928 | D | 989 | 927 | 1,916 | |
| 1924 | D | 2,035 | 202 | 2,327 | |
| 1920 | D | 1,075 | 422 | 1,672 | |
| 1916 | D | 1,231 | 201 | 1,461 | |
| 1912 | D | 992 | 67 | 1,236 | |
| 1908 | — | — | — | — | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Hamilton County's 2024 presidential result — R+71.3 — places it among the most one-sided counties in the state, reflecting a broader pattern of deep-red consolidation across sparsely populated Central Texas ranching communities.
The unraveling was not abrupt. The Democratic margin in Hamilton County peaked at eighty-seven points in 1932; it narrowed steadily over the late twentieth century. The 1980 election delivered the county to the Republican party for the first time in many years, by a margin of five points. By 2024, the margin had widened further.
The economic and demographic context is severe. Hamilton County's median household income of $58,219 is among the lowest of any county in the United States; 17% of residents live below the federal poverty line. The county's voting pattern over the last decade is most similar to that of Bosque County and Coke County.