| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 13,731 | 20,849 | 35,735 | |
| 2020 | R | 14,243 | 21,829 | 37,075 | |
| 2016 | R | 10,448 | 17,865 | 31,313 | |
| 2012 | R | 12,845 | 14,673 | 28,686 | |
| 2008 | R | 14,401 | 15,354 | 30,951 | |
| 2004 | R | 14,393 | 18,291 | 33,362 | |
| 2000 | R | 11,610 | 15,626 | 29,379 | |
| 1996 | D | 12,171 | 10,886 | 27,638 | |
| 1992 | D | 12,072 | 9,284 | 29,659 | |
| 1988 | D | 13,996 | 10,153 | 24,836 | |
| 1984 | R | 13,582 | 13,637 | 27,339 | |
| 1980 | R | 11,817 | 13,041 | 28,176 | |
| 1976 | D | 14,168 | 9,481 | 24,725 | |
| 1972 | D | 11,778 | 10,370 | 23,213 | |
| 1968 | D | 10,884 | 8,230 | 20,890 | |
| 1964 | D | 16,109 | 5,032 | 21,149 | |
| 1960 | D | 12,893 | 8,751 | 21,705 | |
| 1956 | D | 11,183 | 9,201 | 20,384 | |
| 1952 | R | 8,118 | 10,122 | 18,389 | |
| 1948 | R | 5,453 | 5,536 | 11,562 | |
| 1944 | D | 6,476 | 4,609 | 11,225 | |
| 1940 | D | 7,853 | 5,034 | 12,988 | |
| 1936 | D | 7,167 | 2,576 | 10,630 | |
| 1932 | D | 5,504 | 3,299 | 9,296 | |
| 1928 | R | 3,040 | 4,929 | 8,126 | |
| 1924 | R | 1,757 | 3,905 | 8,070 | |
| 1920 | R | 2,297 | 3,272 | 6,205 | |
| 1916 | D | 3,352 | 3,209 | 7,358 | |
| 1912 | D | 1,081 | 701 | 3,657 | |
| 1908 | R | 894 | 1,850 | 3,249 | |
| 1904 | R | 490 | 1,712 | 2,664 | |
| 1900 | R | 888 | 1,153 | 2,139 | |
| 1896 | D | 1,558 | 1,105 | 2,709 | |
| 1892 | R | 299 | 603 | 1,902 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Coos County's economy traces its roots to logging and commercial fishing, and its electorate has shifted steadily rightward over two decades, reaching a nearly 20-point Republican presidential margin in 2024 despite sitting on Oregon's famously scenic southern coast.
The Republican margin in Coos County reached its widest at forty-six points in 1904. The margin in 2024 was twenty points, in line with the county's deep historical pattern.
Coos County's loyalty is rooted in its place. Median household income of $62,143, a 84% non-Hispanic-white share, and a population of 64,827 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 Guthrie County and Trimble County.