| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 2,613 | 10,902 | 13,629 | |
| 2020 | R | 2,465 | 10,079 | 12,660 | |
| 2016 | R | 1,825 | 8,299 | 10,447 | |
| 2012 | R | 1,822 | 7,610 | 9,558 | |
| 2008 | R | 2,250 | 7,281 | 9,629 | |
| 2004 | R | 2,257 | 7,241 | 9,563 | |
| 2000 | R | 2,143 | 6,295 | 8,627 | |
| 1996 | R | 2,633 | 4,290 | 7,737 | |
| 1992 | R | 2,409 | 3,056 | 7,283 | |
| 1988 | R | 2,629 | 3,550 | 6,202 | |
| 1984 | R | 1,894 | 4,042 | 5,954 | |
| 1980 | R | 2,130 | 2,866 | 5,097 | |
| 1976 | D | 2,361 | 1,947 | 4,324 | |
| 1972 | R | 766 | 2,164 | 2,943 | |
| 1968 | D | 1,282 | 1,079 | 2,825 | |
| 1964 | D | 1,727 | 655 | 2,384 | |
| 1960 | D | 1,131 | 704 | 1,840 | |
| 1956 | D | 1,034 | 672 | 1,709 | |
| 1952 | D | 1,102 | 840 | 1,944 | |
| 1948 | D | 1,384 | 253 | 1,679 | |
| 1944 | D | 1,199 | 198 | 1,538 | |
| 1940 | D | 1,484 | 238 | 1,727 | |
| 1936 | D | 1,302 | 107 | 1,409 | |
| 1932 | D | 1,229 | 108 | 1,337 | |
| 1928 | D | 514 | 439 | 953 | |
| 1924 | D | 928 | 88 | 1,077 | |
| 1920 | D | 665 | 184 | 1,092 | |
| 1916 | D | 716 | 72 | 813 | |
| 1912 | D | 432 | 29 | 545 | |
| 1908 | — | — | — | — | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Llano County, anchored by a small ranching and retirement community on the Llano River, delivered roughly 80% of its 2024 presidential vote to the Republican nominee — a margin consistent with its decade-long pattern as one of the state's most reliably one-sided counties.
The unraveling was not abrupt. The Democratic margin in Llano County peaked at eighty-five points in 1936; 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 fourteen points. By 2024, the margin had widened further.
The economic and demographic context is severe. Llano County's median household income of $67,530 is among the lowest of any county in the United States; 12% of residents live below the federal poverty line. The county's voting pattern over the last decade is most similar to that of Brown County and King County.