| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 18,397 | 22,363 | 42,191 | |
| 2020 | R | 19,349 | 22,746 | 43,306 | |
| 2016 | R | 13,032 | 18,114 | 34,433 | |
| 2012 | R | 13,112 | 18,402 | 32,488 | |
| 2008 | R | 13,781 | 17,605 | 31,958 | |
| 2004 | R | 10,471 | 18,482 | 29,430 | |
| 2000 | R | 8,412 | 16,980 | 26,576 | |
| 1996 | R | 8,595 | 12,363 | 23,870 | |
| 1992 | R | 7,860 | 10,716 | 23,476 | |
| 1988 | R | 8,183 | 11,601 | 20,065 | |
| 1984 | R | 6,978 | 13,667 | 20,994 | |
| 1980 | R | 6,483 | 11,299 | 19,850 | |
| 1976 | R | 7,623 | 10,492 | 18,692 | |
| 1972 | R | 5,889 | 10,470 | 17,413 | |
| 1968 | R | 6,787 | 9,093 | 17,230 | |
| 1964 | D | 10,295 | 7,406 | 17,822 | |
| 1960 | R | 8,177 | 9,854 | 18,214 | |
| 1956 | R | 7,600 | 10,405 | 18,122 | |
| 1952 | R | 6,867 | 11,164 | 18,084 | |
| 1948 | D | 7,702 | 7,392 | 15,351 | |
| 1944 | R | 6,557 | 7,081 | 13,713 | |
| 1940 | R | 7,181 | 8,019 | 15,273 | |
| 1936 | D | 8,030 | 4,975 | 13,486 | |
| 1932 | D | 7,316 | 5,584 | 13,859 | |
| 1928 | R | 2,239 | 7,672 | 9,954 | |
| 1924 | R | 995 | 4,543 | 8,177 | |
| 1920 | R | 1,540 | 3,885 | 6,635 | |
| 1916 | R | 2,747 | 3,011 | 6,321 | |
| 1912 | D | 1,331 | 970 | 5,150 | |
| 1908 | R | 871 | 1,639 | 2,745 | |
| 1904 | R | 372 | 1,248 | 1,729 | |
| 1900 | R | 573 | 577 | 1,178 | |
| 1896 | — | — | — | — | |
| 1892 | — | — | — | — | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Chelan County's economy revolves around tree-fruit agriculture and outdoor recreation tourism along Lake Chelan, producing an electorate that has backed Republican presidential candidates by consistent single-digit to low-double-digit margins over the past decade.
The Republican margin in Chelan County reached its widest at fifty-five points in 1928. The margin in 2024 was nine points, in line with the county's deep historical pattern.
Chelan County's loyalty is rooted in its place. Median household income of $82,381, a 67% non-Hispanic-white share, and a population of 80,172 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 Bell County and Madison County.