| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 434 | 2,076 | 2,529 | |
| 2020 | R | 457 | 1,991 | 2,474 | |
| 2016 | R | 354 | 1,656 | 2,057 | |
| 2012 | R | 380 | 1,565 | 1,968 | |
| 2008 | R | 546 | 1,544 | 2,121 | |
| 2004 | R | 459 | 1,600 | 2,077 | |
| 2000 | R | 417 | 1,352 | 1,801 | |
| 1996 | R | 618 | 949 | 1,735 | |
| 1992 | R | 570 | 776 | 1,722 | |
| 1988 | R | 671 | 975 | 1,655 | |
| 1984 | R | 570 | 1,168 | 1,743 | |
| 1980 | R | 630 | 966 | 1,621 | |
| 1976 | D | 814 | 805 | 1,640 | |
| 1972 | R | 369 | 1,096 | 1,487 | |
| 1968 | R | 560 | 789 | 1,518 | |
| 1964 | D | 941 | 590 | 1,535 | |
| 1960 | R | 575 | 833 | 1,417 | |
| 1956 | R | 504 | 885 | 1,390 | |
| 1952 | R | 606 | 1,069 | 1,678 | |
| 1948 | D | 836 | 498 | 1,356 | |
| 1944 | D | 822 | 420 | 1,496 | |
| 1940 | D | 1,065 | 634 | 1,702 | |
| 1936 | D | 787 | 359 | 1,147 | |
| 1932 | D | 828 | 309 | 1,141 | |
| 1928 | R | 244 | 807 | 1,053 | |
| 1924 | D | 384 | 171 | 718 | |
| 1920 | D | 304 | 269 | 673 | |
| 1916 | D | 386 | 157 | 575 | |
| 1912 | D | 472 | 152 | 885 | |
| 1908 | — | — | — | — | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Mason County's sparse ranch land and aging rural population have produced Republican presidential margins exceeding 60 points in recent cycles, making it a textbook example of deep-red small-county consolidation in the Texas Hill Country.
The shift began with civil rights. 1980 marked the realignment in Mason County, by a twenty-one points margin. The Republican margin reached its widest at sixty-five points in 2024. The 2024 margin was sixty-five points.
The political shift has tracked, in Mason County, the political shift of the South more broadly. A 85% non-Hispanic-white share, a median household income of $74,180, and a 7% poverty rate describe the demographic context. The county's voting pattern over the last decade is most similar to that of Fayette County and Lampasas County.
