| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 213 | 1,374 | 1,599 | |
| 2020 | R | 231 | 1,413 | 1,653 | |
| 2016 | R | 230 | 1,225 | 1,484 | |
| 2012 | R | 279 | 1,263 | 1,560 | |
| 2008 | R | 375 | 1,356 | 1,750 | |
| 2004 | R | 326 | 1,480 | 1,812 | |
| 2000 | R | 454 | 1,302 | 1,770 | |
| 1996 | R | 703 | 946 | 1,754 | |
| 1992 | R | 558 | 982 | 1,888 | |
| 1988 | R | 989 | 1,183 | 2,190 | |
| 1984 | R | 521 | 1,219 | 1,750 | |
| 1980 | R | 677 | 1,188 | 1,897 | |
| 1976 | D | 957 | 755 | 1,725 | |
| 1972 | R | 446 | 1,153 | 1,599 | |
| 1968 | D | 662 | 615 | 1,660 | |
| 1964 | D | 1,254 | 567 | 1,827 | |
| 1960 | D | 829 | 737 | 1,576 | |
| 1956 | D | 786 | 628 | 1,415 | |
| 1952 | D | 797 | 742 | 1,541 | |
| 1948 | D | 861 | 176 | 1,110 | |
| 1944 | D | 842 | 144 | 1,159 | |
| 1940 | D | 1,073 | 198 | 1,278 | |
| 1936 | D | 807 | 132 | 942 | |
| 1932 | D | 812 | 87 | 904 | |
| 1928 | R | 285 | 794 | 1,079 | |
| 1924 | D | 588 | 331 | 944 | |
| 1920 | D | 392 | 28 | 473 | |
| 1916 | D | 330 | 14 | 358 | |
| 1912 | D | 144 | 7 | 171 | |
| 1908 | — | — | — | — | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
This sparsely populated South Plains county delivered a 72-point Republican presidential margin in 2024, reflecting the heavily rural, ranching-oriented character common to the region's small counties.
The unraveling was not abrupt. The Democratic margin in Garza County peaked at eighty-eight points in 1916; 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. Garza County's median household income of $46,314 is among the lowest of any county in the United States; 8% of residents live below the federal poverty line. The county's voting pattern over the last decade is most similar to that of Howard County and Colorado County.