| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 8,025 | 17,337 | 25,579 | |
| 2020 | R | 8,988 | 16,516 | 25,891 | |
| 2016 | R | 7,871 | 13,030 | 21,656 | |
| 2012 | R | 7,856 | 12,005 | 20,078 | |
| 2008 | R | 8,854 | 12,404 | 21,396 | |
| 2004 | R | 7,764 | 13,474 | 21,320 | |
| 2000 | R | 7,840 | 10,599 | 18,699 | |
| 1996 | D | 8,132 | 7,678 | 16,983 | |
| 1992 | D | 8,202 | 7,456 | 18,887 | |
| 1988 | D | 9,920 | 9,159 | 19,458 | |
| 1984 | R | 8,838 | 11,074 | 19,962 | |
| 1980 | D | 8,627 | 8,326 | 17,494 | |
| 1976 | D | 9,469 | 5,853 | 15,395 | |
| 1972 | R | 5,097 | 7,179 | 12,502 | |
| 1968 | D | 6,818 | 3,717 | 12,411 | |
| 1964 | D | 7,176 | 2,188 | 9,384 | |
| 1960 | D | 5,246 | 3,129 | 8,391 | |
| 1956 | D | 3,728 | 3,302 | 7,052 | |
| 1952 | D | 3,315 | 3,220 | 6,540 | |
| 1948 | D | 2,649 | 963 | 3,823 | |
| 1944 | D | 2,712 | 878 | 3,841 | |
| 1940 | D | 2,963 | 980 | 3,963 | |
| 1936 | D | 2,213 | 482 | 2,725 | |
| 1932 | D | 2,142 | 407 | 2,566 | |
| 1928 | R | 579 | 1,388 | 1,967 | |
| 1924 | D | 1,197 | 987 | 2,263 | |
| 1920 | D | 620 | 308 | 955 | |
| 1916 | D | 594 | 130 | 797 | |
| 1912 | D | 551 | 175 | 893 | |
| 1908 | — | — | — | — | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
San Patricio sits along the lower Coastal Bend, anchored by Sinton and the port community of Aransas Pass. Once a swing county with a large Hispanic population, it has shifted toward lopsided Republican margins over the past two decades.
The unraveling was not abrupt. The Democratic margin in San Patricio County peaked at sixty-eight points in 1932; it narrowed steadily over the late twentieth century. The 2000 election delivered the county to the Republican party for the first time in many years, by a margin of fifteen points. By 2024, the margin had settled into deep Republican territory.
The economic and demographic context is severe. San Patricio County's median household income of $69,704 is among the lowest of any county in the United States; 15% of residents live below the federal poverty line. The county's voting pattern over the last decade is most similar to that of Refugio County and Crosby County.