| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 1,926 | 6,177 | 8,172 | |
| 2020 | R | 2,374 | 5,646 | 8,110 | |
| 2016 | R | 2,203 | 4,668 | 7,035 | |
| 2012 | R | 2,798 | 4,419 | 7,287 | |
| 2008 | R | 2,675 | 3,980 | 6,710 | |
| 2004 | R | 2,979 | 3,792 | 6,795 | |
| 2000 | D | 3,283 | 3,007 | 6,369 | |
| 1996 | D | 2,912 | 1,944 | 5,175 | |
| 1992 | D | 2,927 | 1,707 | 5,604 | |
| 1988 | D | 3,630 | 2,184 | 5,832 | |
| 1984 | D | 3,339 | 2,663 | 6,016 | |
| 1980 | D | 3,572 | 1,661 | 5,310 | |
| 1976 | D | 3,741 | 1,244 | 4,996 | |
| 1972 | R | 1,976 | 1,977 | 3,953 | |
| 1968 | D | 2,833 | 965 | 4,742 | |
| 1964 | D | 3,350 | 895 | 4,247 | |
| 1960 | D | 2,669 | 935 | 3,616 | |
| 1956 | D | 2,212 | 1,285 | 3,508 | |
| 1952 | D | 2,626 | 1,378 | 4,007 | |
| 1948 | D | 2,147 | 246 | 2,897 | |
| 1944 | D | 2,681 | 126 | 3,042 | |
| 1940 | D | 3,191 | 175 | 3,366 | |
| 1936 | D | 2,633 | 86 | 2,721 | |
| 1932 | D | 2,396 | 148 | 2,544 | |
| 1928 | D | 1,487 | 751 | 2,239 | |
| 1924 | D | 1,487 | 751 | 2,302 | |
| 1920 | D | 1,634 | 225 | 2,515 | |
| 1916 | D | 1,313 | 218 | 1,577 | |
| 1912 | D | 1,051 | 153 | 1,322 | |
| 1908 | — | — | — | — | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Robertson County's R+52.1 margin in 2024 reflects a broader rural Texas pattern, but its modest 16,000 residents and agricultural economy make it a study in small-county political consolidation rather than demographic complexity.
The unraveling was not abrupt. The Democratic margin in Robertson County peaked at ninety-four points in 1936; it narrowed steadily over the late twentieth century. The 2004 election delivered the county to the Republican party for the first time in many years, by a margin of twelve points. By 2024, the margin had widened further.
The economic and demographic context is severe. Robertson County's median household income of $72,236 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 Newton County and Fisher County.