| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 37,148 | 86,547 | 125,038 | |
| 2020 | R | 40,017 | 78,861 | 120,817 | |
| 2016 | R | 28,023 | 65,651 | 99,013 | |
| 2012 | R | 26,271 | 63,469 | 91,184 | |
| 2008 | R | 30,486 | 66,304 | 97,534 | |
| 2004 | R | 22,472 | 70,135 | 93,151 | |
| 2000 | R | 18,469 | 56,054 | 76,008 | |
| 1996 | R | 22,786 | 47,304 | 74,489 | |
| 1992 | R | 22,240 | 48,847 | 82,858 | |
| 1988 | R | 22,202 | 50,760 | 73,292 | |
| 1984 | R | 18,793 | 57,151 | 76,219 | |
| 1980 | R | 18,732 | 46,711 | 67,867 | |
| 1976 | R | 24,797 | 38,478 | 63,707 | |
| 1972 | R | 15,353 | 43,564 | 59,296 | |
| 1968 | R | 15,430 | 25,646 | 50,154 | |
| 1964 | D | 22,057 | 17,372 | 39,463 | |
| 1960 | R | 15,340 | 20,065 | 35,607 | |
| 1956 | R | 12,540 | 13,970 | 26,576 | |
| 1952 | R | 11,650 | 16,137 | 27,845 | |
| 1948 | D | 11,114 | 2,837 | 15,207 | |
| 1944 | D | 7,654 | 1,169 | 10,856 | |
| 1940 | D | 8,113 | 1,283 | 9,413 | |
| 1936 | D | 6,425 | 622 | 7,063 | |
| 1932 | D | 5,330 | 590 | 5,953 | |
| 1928 | R | 1,979 | 3,079 | 5,065 | |
| 1924 | D | 1,710 | 411 | 2,313 | |
| 1920 | D | 1,180 | 204 | 1,452 | |
| 1916 | D | 633 | 34 | 698 | |
| 1912 | D | 366 | 16 | 429 | |
| 1908 | — | — | — | — | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Home to Texas Tech University and a regional medical center, Lubbock County anchors the southern Llano Estacado yet continues to post Republican presidential margins well above 35 points, resisting the urban drift seen elsewhere.
The unraveling was not abrupt. The Democratic margin in Lubbock County peaked at eighty-six points in 1916; it narrowed steadily over the late twentieth century. The 1968 election delivered the county to the Republican party for the first time in many years, by a margin of twenty points. By 2024, the margin had settled into deep Republican territory.
The economic and demographic context is severe. Lubbock County's median household income of $64,155 is among the lowest of any county in the United States; 17% of residents live below the federal poverty line. The county's voting pattern over the last decade is most similar to that of Rockwall County and Garfield County.