| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 40,304 | 47,873 | 90,851 | |
| 2020 | R | 40,311 | 42,619 | 86,053 | |
| 2016 | R | 31,361 | 39,816 | 80,821 | |
| 2012 | R | 34,712 | 36,855 | 73,855 | |
| 2008 | D | 37,622 | 32,566 | 71,419 | |
| 2004 | R | 26,010 | 39,619 | 66,711 | |
| 2000 | R | 21,451 | 33,536 | 58,995 | |
| 1996 | R | 21,693 | 24,238 | 50,471 | |
| 1992 | R | 18,077 | 25,312 | 53,116 | |
| 1988 | R | 22,107 | 26,699 | 49,137 | |
| 1984 | R | 18,054 | 29,221 | 47,629 | |
| 1980 | R | 13,562 | 23,886 | 43,620 | |
| 1976 | R | 17,879 | 22,583 | 41,411 | |
| 1972 | R | 14,073 | 21,770 | 36,306 | |
| 1968 | R | 10,819 | 15,240 | 27,271 | |
| 1964 | D | 15,674 | 12,972 | 28,669 | |
| 1960 | R | 12,213 | 17,498 | 29,711 | |
| 1956 | R | 9,821 | 16,932 | 26,770 | |
| 1952 | R | 9,193 | 18,094 | 27,344 | |
| 1948 | R | 9,937 | 11,430 | 21,836 | |
| 1944 | R | 10,390 | 10,661 | 21,167 | |
| 1940 | R | 11,911 | 12,567 | 24,586 | |
| 1936 | D | 12,400 | 7,632 | 21,670 | |
| 1932 | D | 11,094 | 8,937 | 20,394 | |
| 1928 | R | 6,315 | 12,480 | 18,858 | |
| 1924 | R | 1,352 | 9,906 | 15,041 | |
| 1920 | R | 2,817 | 10,735 | 13,938 | |
| 1916 | D | 3,303 | 3,093 | 6,626 | |
| 1912 | D | 1,814 | 1,316 | 5,019 | |
| 1908 | R | 2,000 | 3,681 | 5,887 | |
| 1904 | R | 609 | 3,788 | 4,711 | |
| 1900 | R | 1,636 | 3,485 | 5,306 | |
| 1896 | R | 2,089 | 3,050 | 5,187 | |
| 1892 | R | 0 | 2,022 | 3,746 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Cass County anchors North Dakota's most urban corridor and is home to Fargo, the state's largest city. Despite its population density relative to the state, it still delivered an R+8.3 margin in 2024, underscoring how even college-town metros can lean right in plains states.
The Democratic margin in Cass County has rarely exceeded twenty-two points in modern history; the Republican margin has rarely exceeded sixty-seven points. 2024 delivered the county to the Republican candidate by eight points.
Cass County's demographics resemble the country more than they resemble most counties. A 82% non-Hispanic-white share, a 11% poverty rate, and a median household income of $75,555 — all within the broad national range. The county's voting pattern over the last decade is most similar to that of Polk County and Yamhill County.