| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 7,726 | 7,944 | 16,201 | |
| 2020 | R | 8,066 | 8,354 | 16,888 | |
| 2016 | R | 5,768 | 6,538 | 13,803 | |
| 2012 | D | 6,293 | 5,684 | 12,519 | |
| 2008 | D | 7,072 | 5,757 | 13,297 | |
| 2004 | R | 6,750 | 7,003 | 13,951 | |
| 2000 | R | 5,762 | 5,775 | 12,376 | |
| 1996 | D | 5,775 | 3,884 | 11,332 | |
| 1992 | D | 5,040 | 3,359 | 11,484 | |
| 1988 | D | 5,529 | 4,297 | 10,070 | |
| 1984 | R | 4,988 | 5,267 | 10,308 | |
| 1980 | D | 4,521 | 4,123 | 9,903 | |
| 1976 | D | 4,456 | 4,033 | 8,867 | |
| 1972 | R | 3,544 | 4,120 | 8,044 | |
| 1968 | D | 3,609 | 3,261 | 7,291 | |
| 1964 | D | 5,246 | 2,318 | 7,573 | |
| 1960 | D | 4,098 | 3,935 | 8,044 | |
| 1956 | R | 3,684 | 4,306 | 7,990 | |
| 1952 | R | 3,401 | 4,931 | 8,362 | |
| 1948 | D | 3,128 | 2,952 | 6,286 | |
| 1944 | D | 2,634 | 2,477 | 5,186 | |
| 1940 | D | 2,786 | 2,516 | 5,338 | |
| 1936 | D | 2,781 | 1,380 | 4,583 | |
| 1932 | D | 2,726 | 1,722 | 4,755 | |
| 1928 | R | 1,204 | 2,570 | 3,850 | |
| 1924 | R | 795 | 2,201 | 3,719 | |
| 1920 | R | 828 | 1,664 | 2,737 | |
| 1916 | R | 1,175 | 1,547 | 2,872 | |
| 1912 | R | 411 | 496 | 1,478 | |
| 1908 | R | 253 | 641 | 1,066 | |
| 1904 | R | 136 | 729 | 1,049 | |
| 1900 | R | 313 | 623 | 1,035 | |
| 1896 | R | 536 | 691 | 1,243 | |
| 1892 | R | 258 | 522 | 948 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Tillamook, long associated with its namesake cheese cooperative, has shifted rightward over two decades — its 2024 presidential margin of R+1.4 reflects a rural coastal realignment that few Oregon counties illustrate as clearly.
The county's recent history is a story of close margins. The Democratic margin reached thirty-nine points in 1964; the Republican margin reached fifty-seven points in 1904. Most other elections have been decided by single-digit points.
Tillamook County's demographics — a population of 27,496, a 84% non-Hispanic-white share, a median household income of $69,105 — situate the county close to national averages on several dimensions. The county's voting pattern over the last decade is most similar to that of Huerfano County and Pacific County.