| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 131,163 | 145,338 | 287,082 | |
| 2020 | R | 135,765 | 148,576 | 295,430 | |
| 2016 | R | 93,767 | 113,435 | 236,050 | |
| 2012 | R | 102,295 | 115,285 | 225,754 | |
| 2008 | R | 105,786 | 108,314 | 219,511 | |
| 2004 | R | 87,490 | 111,606 | 202,587 | |
| 2000 | R | 74,604 | 89,299 | 172,112 | |
| 1996 | D | 71,727 | 66,628 | 159,232 | |
| 1992 | D | 69,526 | 59,984 | 169,132 | |
| 1988 | R | 68,520 | 68,787 | 139,150 | |
| 1984 | R | 59,620 | 88,043 | 149,336 | |
| 1980 | R | 49,263 | 78,096 | 140,685 | |
| 1976 | R | 55,660 | 68,290 | 127,954 | |
| 1972 | R | 44,337 | 74,320 | 125,185 | |
| 1968 | R | 49,423 | 52,650 | 110,594 | |
| 1964 | D | 62,092 | 49,387 | 111,581 | |
| 1960 | R | 55,553 | 59,557 | 115,369 | |
| 1956 | R | 48,833 | 60,335 | 109,287 | |
| 1952 | R | 45,827 | 56,958 | 103,236 | |
| 1948 | D | 49,649 | 37,086 | 88,988 | |
| 1944 | D | 45,491 | 36,359 | 82,306 | |
| 1940 | D | 44,852 | 33,228 | 78,793 | |
| 1936 | D | 48,117 | 19,951 | 70,125 | |
| 1932 | D | 36,953 | 24,848 | 65,125 | |
| 1928 | R | 18,527 | 35,858 | 54,758 | |
| 1924 | R | 6,036 | 23,403 | 47,473 | |
| 1920 | R | 13,412 | 26,219 | 43,301 | |
| 1916 | D | 21,339 | 19,503 | 43,120 | |
| 1912 | D | 10,845 | 4,205 | 35,268 | |
| 1908 | R | 6,557 | 11,719 | 19,970 | |
| 1904 | R | 2,602 | 10,258 | 14,305 | |
| 1900 | R | 5,125 | 5,515 | 11,065 | |
| 1896 | D | 5,829 | 2,701 | 8,652 | |
| 1892 | R | 2,247 | 3,367 | 7,408 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Spokane County contains Washington's second-largest city yet sits well east of the Cascades, producing a competitive lean that has tightened over successive presidential cycles as the city core trends differently from its suburban and rural fringe.
The Democratic margin in Spokane County has rarely exceeded forty points in modern history; the Republican margin has rarely exceeded fifty-four points. 2024 delivered the county to the Republican candidate by five points.
Spokane County's demographics resemble the country more than they resemble most counties. A 83% non-Hispanic-white share, a 12% poverty rate, and a median household income of $78,582 — all within the broad national range. The county's voting pattern over the last decade is most similar to that of Kittitas County and Klickitat County.
