| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 280 | 1,506 | 1,805 | |
| 2020 | R | 282 | 1,615 | 1,934 | |
| 2016 | R | 254 | 1,496 | 1,832 | |
| 2012 | R | 354 | 1,395 | 1,778 | |
| 2008 | R | 402 | 1,329 | 1,766 | |
| 2004 | R | 398 | 1,467 | 1,897 | |
| 2000 | R | 438 | 1,358 | 1,852 | |
| 1996 | R | 520 | 1,120 | 1,858 | |
| 1992 | R | 488 | 992 | 2,116 | |
| 1988 | R | 725 | 1,403 | 2,154 | |
| 1984 | R | 493 | 1,692 | 2,203 | |
| 1980 | R | 486 | 1,690 | 2,317 | |
| 1976 | R | 879 | 1,325 | 2,255 | |
| 1972 | R | 539 | 1,549 | 2,088 | |
| 1968 | R | 579 | 1,392 | 2,174 | |
| 1964 | R | 1,195 | 1,283 | 2,478 | |
| 1960 | R | 893 | 1,766 | 2,659 | |
| 1956 | R | 848 | 1,850 | 2,698 | |
| 1952 | R | 730 | 2,300 | 3,030 | |
| 1948 | R | 1,220 | 1,490 | 2,710 | |
| 1944 | R | 1,006 | 1,991 | 2,997 | |
| 1940 | R | 1,353 | 2,182 | 3,535 | |
| 1936 | D | 2,084 | 1,692 | 3,814 | |
| 1932 | D | 2,486 | 1,272 | 3,879 | |
| 1928 | R | 1,055 | 2,702 | 3,861 | |
| 1924 | R | 1,216 | 1,845 | 3,689 | |
| 1920 | R | 974 | 1,756 | 2,947 | |
| 1916 | D | 1,267 | 834 | 2,225 | |
| 1912 | D | 918 | 325 | 2,059 | |
| 1908 | D | 1,158 | 1,081 | 2,403 | |
| 1904 | R | 299 | 1,178 | 2,039 | |
| 1900 | D | 977 | 880 | 1,967 | |
| 1896 | D | 1,151 | 836 | 2,050 | |
| 1892 | D | 568 | 101 | 1,540 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Harlan County, anchored by the reservoir bearing its name in south-central Nebraska, recorded an R+68 presidential margin in 2024, placing it among the state's most one-sided rural counties. Its shrinking, agriculture-dependent population has trended heavily Republican for decades.
The Republican margin in Harlan County reached its widest at sixty-nine points in 2020. The margin in 2024 was sixty-eight points, in line with the county's deep historical pattern.
Harlan County's loyalty is rooted in its place. Median household income of $70,625, a 95% non-Hispanic-white share, and a population of 2,847 together describe a community whose political habits are deeply settled. The county's voting pattern over the last decade is most similar to that of Boyd County and Morrill County.
