| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 729 | 3,398 | 4,163 | |
| 2020 | R | 840 | 3,521 | 4,418 | |
| 2016 | R | 771 | 3,111 | 3,995 | |
| 2012 | R | 998 | 3,058 | 4,091 | |
| 2008 | R | 1,156 | 3,344 | 4,525 | |
| 2004 | R | 857 | 3,410 | 4,271 | |
| 2000 | R | 1,114 | 3,451 | 4,598 | |
| 1996 | R | 1,683 | 2,593 | 4,574 | |
| 1992 | R | 1,737 | 2,998 | 5,450 | |
| 1988 | R | 2,230 | 3,064 | 5,316 | |
| 1984 | R | 1,919 | 3,892 | 5,828 | |
| 1980 | R | 2,132 | 3,723 | 5,933 | |
| 1976 | D | 3,374 | 2,413 | 5,815 | |
| 1972 | R | 1,350 | 3,981 | 5,366 | |
| 1968 | R | 2,267 | 2,595 | 6,322 | |
| 1964 | D | 4,318 | 2,022 | 6,349 | |
| 1960 | D | 3,089 | 2,764 | 6,007 | |
| 1956 | D | 3,325 | 1,840 | 5,177 | |
| 1952 | R | 2,748 | 2,913 | 5,672 | |
| 1948 | D | 3,286 | 475 | 3,947 | |
| 1944 | D | 2,407 | 616 | 3,444 | |
| 1940 | D | 3,259 | 513 | 3,783 | |
| 1936 | D | 2,320 | 300 | 2,630 | |
| 1932 | D | 2,978 | 271 | 3,288 | |
| 1928 | R | 440 | 1,266 | 1,706 | |
| 1924 | D | 5,224 | 596 | 5,979 | |
| 1920 | D | 264 | 136 | 419 | |
| 1916 | D | 150 | 14 | 172 | |
| 1912 | D | 53 | 6 | 84 | |
| 1908 | — | — | — | — | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Lamb County's cotton-farming economy and sparse, rural population have anchored some of the widest Republican presidential margins in Texas, with 2024 returns reflecting a community where competitive general elections are effectively rare.
The unraveling was not abrupt. The Democratic margin in Lamb County peaked at eighty-two 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 twenty-seven points. By 2024, the margin had widened further.
The economic and demographic context is severe. Lamb County's median household income of $60,760 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 Floyd County and Lincoln County.