| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 2,831 | 10,090 | 13,031 | |
| 2020 | R | 2,916 | 9,239 | 12,290 | |
| 2016 | R | 2,465 | 7,740 | 10,512 | |
| 2012 | R | 2,704 | 6,830 | 9,648 | |
| 2008 | R | 3,006 | 6,693 | 9,778 | |
| 2004 | R | 2,640 | 6,569 | 9,268 | |
| 2000 | R | 2,637 | 5,390 | 8,247 | |
| 1996 | R | 2,964 | 3,769 | 7,440 | |
| 1992 | R | 2,246 | 2,826 | 6,770 | |
| 1988 | R | 2,305 | 3,858 | 6,196 | |
| 1984 | R | 1,696 | 4,352 | 6,067 | |
| 1980 | R | 1,800 | 3,081 | 5,068 | |
| 1976 | D | 2,136 | 1,985 | 4,181 | |
| 1972 | R | 844 | 2,037 | 2,890 | |
| 1968 | D | 1,222 | 1,076 | 2,715 | |
| 1964 | D | 1,492 | 602 | 2,101 | |
| 1960 | D | 948 | 792 | 1,748 | |
| 1956 | R | 425 | 757 | 1,189 | |
| 1952 | R | 503 | 818 | 1,325 | |
| 1948 | D | 418 | 235 | 685 | |
| 1944 | D | 456 | 150 | 621 | |
| 1940 | D | 536 | 141 | 677 | |
| 1936 | D | 206 | 60 | 277 | |
| 1932 | D | 268 | 39 | 308 | |
| 1928 | R | 152 | 161 | 313 | |
| 1924 | D | 195 | 75 | 278 | |
| 1920 | D | 146 | 49 | 195 | |
| 1916 | D | 179 | 24 | 211 | |
| 1912 | D | 187 | 7 | 232 | |
| 1908 | — | — | — | — | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Aransas County, anchored by the port city of Rockport, delivers some of Texas's widest presidential margins despite a modest Gulf Coast population — its R+55.7 spread in 2024 reflects a heavily white, working-class waterfront electorate.
The unraveling was not abrupt. The Democratic margin in Aransas County peaked at seventy-eight points in 1912; 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 twenty-five points. By 2024, the margin had widened further.
The economic and demographic context is severe. Aransas County's median household income of $69,466 is among the lowest of any county in the United States; 14% of residents live below the federal poverty line. The county's voting pattern over the last decade is most similar to that of Rusk County and Suwannee County.