| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 731 | 3,416 | 4,209 | |
| 2020 | R | 763 | 3,544 | 4,369 | |
| 2016 | R | 571 | 3,235 | 4,034 | |
| 2012 | R | 928 | 3,044 | 4,058 | |
| 2008 | R | 974 | 2,942 | 3,968 | |
| 2004 | R | 743 | 3,356 | 4,137 | |
| 2000 | R | 778 | 2,953 | 3,849 | |
| 1996 | R | 830 | 2,504 | 3,823 | |
| 1992 | R | 740 | 2,050 | 3,969 | |
| 1988 | R | 1,075 | 2,886 | 3,991 | |
| 1984 | R | 631 | 3,433 | 4,082 | |
| 1980 | R | 710 | 3,381 | 4,354 | |
| 1976 | R | 1,139 | 2,485 | 3,760 | |
| 1972 | R | 665 | 2,513 | 3,178 | |
| 1968 | R | 694 | 2,126 | 2,998 | |
| 1964 | R | 1,784 | 1,927 | 3,711 | |
| 1960 | R | 1,211 | 2,680 | 3,891 | |
| 1956 | R | 930 | 2,624 | 3,554 | |
| 1952 | R | 769 | 2,790 | 3,559 | |
| 1948 | R | 1,109 | 1,600 | 2,709 | |
| 1944 | R | 1,147 | 1,739 | 2,886 | |
| 1940 | R | 1,759 | 2,022 | 3,781 | |
| 1936 | D | 2,000 | 1,094 | 3,152 | |
| 1932 | D | 2,009 | 946 | 2,991 | |
| 1928 | R | 832 | 1,715 | 2,556 | |
| 1924 | R | 602 | 1,069 | 2,141 | |
| 1920 | R | 472 | 1,050 | 1,622 | |
| 1916 | D | 544 | 389 | 996 | |
| 1912 | D | 304 | 188 | 816 | |
| 1908 | R | 310 | 368 | 689 | |
| 1904 | R | 89 | 263 | 437 | |
| 1900 | R | 216 | 246 | 470 | |
| 1896 | D | 269 | 178 | 449 | |
| 1892 | D | 210 | 98 | 555 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Keith County's economy revolves around irrigation agriculture and recreation along Nebraska's largest reservoir, sustaining a small population spread across the North Platte River valley that votes with some of the widest Republican margins in the state.
The Republican margin in Keith County reached its widest at sixty-nine points in 1984. The margin in 2024 was sixty-four points, in line with the county's deep historical pattern.
Keith County's loyalty is rooted in its place. Median household income of $60,645, a 88% non-Hispanic-white share, and a population of 8,219 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 Phelps County and Garden County.