| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 42,479 | 45,976 | 90,133 | |
| 2020 | D | 46,926 | 43,683 | 92,599 | |
| 2016 | D | 40,440 | 39,149 | 87,286 | |
| 2012 | D | 50,652 | 38,251 | 90,263 | |
| 2008 | D | 48,927 | 36,365 | 86,371 | |
| 2004 | D | 42,122 | 39,958 | 82,722 | |
| 2000 | D | 35,857 | 32,801 | 70,568 | |
| 1996 | D | 32,694 | 26,751 | 65,202 | |
| 1992 | D | 33,765 | 28,844 | 74,662 | |
| 1988 | D | 34,415 | 31,025 | 66,035 | |
| 1984 | R | 32,550 | 38,034 | 71,212 | |
| 1980 | R | 26,391 | 34,701 | 67,926 | |
| 1976 | R | 29,771 | 35,021 | 65,940 | |
| 1972 | R | 23,810 | 34,135 | 59,455 | |
| 1968 | R | 24,596 | 25,783 | 55,018 | |
| 1964 | D | 31,526 | 19,488 | 51,098 | |
| 1960 | R | 23,004 | 27,617 | 50,671 | |
| 1956 | R | 18,969 | 27,965 | 47,104 | |
| 1952 | R | 17,807 | 29,719 | 48,026 | |
| 1948 | R | 16,661 | 16,842 | 34,081 | |
| 1944 | D | 18,962 | 18,015 | 37,081 | |
| 1940 | D | 20,996 | 18,504 | 39,630 | |
| 1936 | D | 20,737 | 12,691 | 34,145 | |
| 1932 | D | 16,887 | 14,218 | 32,455 | |
| 1928 | R | 12,942 | 16,974 | 30,058 | |
| 1924 | R | 4,347 | 18,360 | 30,438 | |
| 1920 | R | 5,473 | 16,233 | 27,631 | |
| 1916 | R | 5,212 | 8,329 | 14,770 | |
| 1912 | D | 5,632 | 1,568 | 13,679 | |
| 1908 | R | 5,845 | 6,845 | 13,489 | |
| 1904 | R | 4,931 | 6,789 | 13,066 | |
| 1900 | R | 5,157 | 6,327 | 12,155 | |
| 1896 | R | 4,032 | 6,419 | 10,930 | |
| 1892 | D | 6,205 | 2,999 | 9,328 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Home to Davenport and anchoring Iowa's Quad Cities metro, Scott County shifted from a reliable Democratic stronghold to an R+3.9 result in 2024, tracking a broader blue-collar realignment along the upper Mississippi corridor.
The Democratic margin in Scott County has rarely exceeded thirty-four points in modern history; the Republican margin has rarely exceeded forty-six points. 2024 delivered the county to the Republican candidate by four points.
Scott County's demographics resemble the country more than they resemble most counties. A 79% non-Hispanic-white share, a 12% poverty rate, and a median household income of $78,277 — all within the broad national range. The county's voting pattern over the last decade is most similar to that of Big Horn County and Erie County.
