| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 978 | 1,125 | 2,123 | |
| 2020 | R | 1,122 | 1,180 | 2,379 | |
| 2016 | R | 919 | 1,043 | 2,088 | |
| 2012 | D | 1,247 | 939 | 2,215 | |
| 2008 | D | 1,120 | 972 | 2,126 | |
| 2004 | D | 1,212 | 1,154 | 2,387 | |
| 2000 | R | 924 | 1,040 | 2,082 | |
| 1996 | D | 962 | 835 | 2,114 | |
| 1992 | R | 865 | 898 | 2,257 | |
| 1988 | D | 1,225 | 1,105 | 2,340 | |
| 1984 | R | 1,077 | 1,410 | 2,500 | |
| 1980 | R | 726 | 1,454 | 2,356 | |
| 1976 | R | 1,021 | 1,290 | 2,393 | |
| 1972 | R | 840 | 1,565 | 2,405 | |
| 1968 | R | 802 | 1,341 | 2,353 | |
| 1964 | D | 1,700 | 1,194 | 2,894 | |
| 1960 | R | 1,315 | 1,757 | 3,072 | |
| 1956 | R | 1,406 | 1,722 | 3,128 | |
| 1952 | R | 1,174 | 1,918 | 3,092 | |
| 1948 | D | 1,890 | 1,149 | 3,039 | |
| 1944 | D | 1,632 | 1,584 | 3,216 | |
| 1940 | D | 2,039 | 1,973 | 4,012 | |
| 1936 | D | 2,676 | 1,195 | 4,062 | |
| 1932 | D | 3,273 | 739 | 4,056 | |
| 1928 | D | 1,837 | 1,538 | 3,393 | |
| 1924 | R | 1,191 | 1,210 | 3,239 | |
| 1920 | R | 925 | 1,667 | 2,632 | |
| 1916 | D | 1,255 | 717 | 2,009 | |
| 1912 | D | 834 | 437 | 1,838 | |
| 1908 | R | 734 | 895 | 1,657 | |
| 1904 | R | 539 | 757 | 1,342 | |
| 1900 | R | 656 | 803 | 1,473 | |
| 1896 | D | 717 | 508 | 1,231 | |
| 1892 | D | 470 | 78 | 744 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Thurston County's large Native American population — centered on the Omaha and Winnebago reservations — shapes voting patterns that have historically made it one of the most competitive counties in an otherwise reliably red state.
The Democratic margin in Thurston County has rarely exceeded sixty-two points in modern history; the Republican margin has rarely exceeded thirty-one points. 2024 delivered the county to the Republican candidate by seven points.
Thurston County's demographics resemble the country more than they resemble most counties. A 37% non-Hispanic-white share, a 14% poverty rate, and a median household income of $69,177 — all within the broad national range. The county's voting pattern over the last decade is most similar to that of Mahnomen County and Muscatine County.
