| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 214 | 752 | 988 | |
| 2020 | R | 249 | 821 | 1,083 | |
| 2016 | R | 206 | 698 | 961 | |
| 2012 | R | 257 | 702 | 998 | |
| 2008 | R | 367 | 594 | 1,001 | |
| 2004 | R | 281 | 734 | 1,033 | |
| 2000 | R | 243 | 752 | 1,044 | |
| 1996 | R | 379 | 634 | 1,162 | |
| 1992 | R | 321 | 512 | 1,211 | |
| 1988 | R | 418 | 771 | 1,208 | |
| 1984 | R | 323 | 895 | 1,229 | |
| 1980 | R | 283 | 872 | 1,256 | |
| 1976 | R | 506 | 638 | 1,163 | |
| 1972 | R | 365 | 808 | 1,235 | |
| 1968 | R | 390 | 670 | 1,144 | |
| 1964 | D | 619 | 533 | 1,155 | |
| 1960 | R | 501 | 597 | 1,100 | |
| 1956 | R | 488 | 601 | 1,089 | |
| 1952 | R | 411 | 671 | 1,088 | |
| 1948 | D | 542 | 354 | 926 | |
| 1944 | D | 440 | 393 | 842 | |
| 1940 | D | 550 | 434 | 994 | |
| 1936 | D | 758 | 276 | 1,065 | |
| 1932 | D | 731 | 252 | 1,010 | |
| 1928 | R | 332 | 446 | 786 | |
| 1924 | R | 141 | 239 | 709 | |
| 1920 | R | 331 | 757 | 1,190 | |
| 1916 | — | — | — | — | |
| 1912 | — | — | — | — | |
| 1908 | — | — | — | — | |
| 1904 | — | — | — | — | |
| 1900 | — | — | — | — | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Liberty County's sparse Hi-Line population — fewer than 2,200 residents spread across nearly 1,500 square miles of northern plains — has delivered some of Montana's widest presidential margins, reflecting the deep Republican lean common to the state's agricultural frontier.
The Democratic margin in Liberty County peaked at forty-seven points in 1932. By 1968 the county had flipped, voting Republican for the first time in many years. The 2024 margin was fifty-four points, the most Republican-leaning result in the county's modern history.
The economic context is the key. Liberty County's median household income of $57,857 sits well below state and national norms, and 26% of residents live below the federal poverty line. The shift here is part of a broader realignment of working-class places across the country. The county's voting pattern over the last decade is most similar to that of Grant County and Sheridan County.