| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 2,232 | 8,961 | 11,321 | |
| 2020 | R | 2,144 | 8,086 | 10,399 | |
| 2016 | R | 1,483 | 6,385 | 8,205 | |
| 2012 | R | 1,479 | 5,621 | 7,204 | |
| 2008 | R | 1,903 | 5,651 | 7,634 | |
| 2004 | R | 1,593 | 5,422 | 7,025 | |
| 2000 | R | 1,569 | 4,526 | 6,214 | |
| 1996 | R | 1,819 | 3,008 | 5,362 | |
| 1992 | R | 1,508 | 2,233 | 5,185 | |
| 1988 | R | 1,954 | 3,000 | 4,966 | |
| 1984 | R | 1,356 | 3,285 | 4,653 | |
| 1980 | R | 1,979 | 2,323 | 4,381 | |
| 1976 | D | 2,376 | 1,563 | 3,982 | |
| 1972 | R | 688 | 2,251 | 2,949 | |
| 1968 | D | 1,423 | 935 | 2,818 | |
| 1964 | D | 2,224 | 744 | 2,970 | |
| 1960 | D | 1,372 | 1,222 | 2,609 | |
| 1956 | R | 1,134 | 1,308 | 2,447 | |
| 1952 | R | 1,199 | 1,478 | 2,677 | |
| 1948 | D | 1,459 | 276 | 1,807 | |
| 1944 | D | 1,693 | 212 | 2,066 | |
| 1940 | D | 2,006 | 244 | 2,251 | |
| 1936 | D | 1,462 | 134 | 1,599 | |
| 1932 | D | 1,824 | 120 | 1,944 | |
| 1928 | R | 567 | 899 | 1,476 | |
| 1924 | D | 356 | 121 | 507 | |
| 1920 | D | 778 | 227 | 1,348 | |
| 1916 | D | 848 | 113 | 995 | |
| 1912 | D | 517 | 67 | 727 | |
| 1908 | — | — | — | — | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Lampasas County's 2024 presidential margin of R+59.5 reflects a broader pattern across the Edwards Plateau, where small, majority-Anglo rural populations have shifted decisively toward Republicans over the past two decades.
The unraveling was not abrupt. The Democratic margin in Lampasas County peaked at eighty-eight 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 eight points. By 2024, the margin had widened further.
The economic and demographic context is severe. Lampasas County's median household income of $81,736 is among the lowest of any county in the United States; 9% of residents live below the federal poverty line. The county's voting pattern over the last decade is most similar to that of Medina County and Cooke County.