| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 1,235 | 9,215 | 10,497 | |
| 2020 | R | 1,333 | 8,804 | 10,205 | |
| 2016 | R | 1,170 | 7,347 | 8,665 | |
| 2012 | R | 1,428 | 6,796 | 8,314 | |
| 2008 | R | 1,869 | 6,293 | 8,223 | |
| 2004 | R | 2,152 | 5,974 | 8,177 | |
| 2000 | R | 2,171 | 5,288 | 7,546 | |
| 1996 | R | 2,575 | 3,697 | 6,855 | |
| 1992 | R | 2,700 | 3,362 | 7,776 | |
| 1988 | R | 3,531 | 4,377 | 7,962 | |
| 1984 | R | 2,464 | 5,058 | 7,532 | |
| 1980 | R | 2,678 | 3,254 | 5,999 | |
| 1976 | D | 3,458 | 2,466 | 5,964 | |
| 1972 | R | 1,429 | 3,288 | 4,721 | |
| 1968 | D | 2,165 | 1,698 | 5,314 | |
| 1964 | D | 4,031 | 1,480 | 5,517 | |
| 1960 | D | 4,002 | 1,507 | 5,522 | |
| 1956 | R | 2,412 | 2,509 | 4,941 | |
| 1952 | R | 2,750 | 3,599 | 6,361 | |
| 1948 | D | 3,046 | 1,165 | 4,511 | |
| 1944 | D | 3,406 | 960 | 4,955 | |
| 1940 | D | 2,419 | 1,412 | 3,836 | |
| 1936 | D | 2,204 | 403 | 2,620 | |
| 1932 | D | 4,378 | 224 | 4,613 | |
| 1928 | D | 2,842 | 911 | 3,753 | |
| 1924 | D | 3,290 | 746 | 5,271 | |
| 1920 | D | 1,249 | 100 | 3,194 | |
| 1916 | D | 1,784 | 936 | 2,967 | |
| 1912 | D | 1,455 | 265 | 2,160 | |
| 1908 | — | — | — | — | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Lavaca County, anchored by the small city of Hallettsville, recorded an R+76.1 presidential margin in 2024, placing it among the most heavily one-sided rural counties in a state already trending sharply away from competitive presidential contests.
The unraveling was not abrupt. The Democratic margin in Lavaca County peaked at ninety 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 ten points. By 2024, the margin had widened further.
The economic and demographic context is severe. Lavaca County's median household income of $63,240 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 Childress County and Van Zandt County.