| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 19,753 | 38,792 | 59,349 | |
| 2020 | R | 19,052 | 37,197 | 57,568 | |
| 2016 | R | 14,846 | 33,098 | 51,410 | |
| 2012 | R | 17,044 | 30,912 | 49,104 | |
| 2008 | R | 19,844 | 29,695 | 50,179 | |
| 2004 | R | 16,681 | 27,253 | 44,217 | |
| 2000 | R | 14,921 | 20,113 | 35,869 | |
| 1996 | R | 11,743 | 13,495 | 29,010 | |
| 1992 | R | 10,246 | 10,349 | 29,905 | |
| 1988 | R | 10,092 | 12,799 | 22,958 | |
| 1984 | R | 7,517 | 14,456 | 21,973 | |
| 1980 | R | 8,198 | 10,105 | 19,134 | |
| 1976 | D | 9,008 | 7,182 | 16,330 | |
| 1972 | R | 3,731 | 9,242 | 12,973 | |
| 1968 | R | 4,468 | 5,271 | 11,677 | |
| 1964 | D | 6,658 | 3,665 | 10,323 | |
| 1960 | R | 5,718 | 6,523 | 12,241 | |
| 1956 | R | 5,575 | 5,589 | 11,164 | |
| 1952 | R | 5,089 | 6,000 | 11,102 | |
| 1948 | D | 5,415 | 3,614 | 9,045 | |
| 1944 | R | 4,347 | 4,687 | 9,041 | |
| 1940 | D | 5,479 | 4,983 | 10,479 | |
| 1936 | D | 5,731 | 4,070 | 9,853 | |
| 1932 | D | 5,772 | 3,009 | 8,847 | |
| 1928 | R | 3,647 | 5,299 | 8,964 | |
| 1924 | D | 4,709 | 3,610 | 8,561 | |
| 1920 | D | 5,030 | 4,055 | 9,185 | |
| 1916 | D | 3,337 | 2,104 | 5,544 | |
| 1912 | D | 3,247 | 1,034 | 5,627 | |
| 1908 | D | 3,143 | 2,193 | 5,504 | |
| 1904 | D | 2,750 | 2,375 | 5,354 | |
| 1900 | D | 3,350 | 2,162 | 5,712 | |
| 1896 | D | 3,975 | 2,229 | 6,279 | |
| 1892 | D | 3,027 | 1,908 | 5,416 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Cass County sits at the edge of the Kansas City metro, where outer-ring suburban growth has accompanied a consistent rightward shift — its 2024 presidential margin of R+32.1 reflects a pattern common to fast-growing exurban counties nationwide.
The Republican margin in Cass County reached its widest at forty-two points in 1972. The margin in 2024 was thirty-two points, in line with the county's deep historical pattern.
Cass County's loyalty is rooted in its place. Median household income of $87,535, a 85% non-Hispanic-white share, and a population of 110,773 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 Douglas County and Butler County.
