| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | R | 37,945 | 47,438 | 87,073 | |
| 2020 | R | 37,713 | 44,825 | 86,133 | |
| 2016 | R | 32,838 | 41,622 | 80,540 | |
| 2012 | D | 38,811 | 36,547 | 77,306 | |
| 2008 | D | 41,514 | 37,495 | 80,367 | |
| 2004 | D | 40,417 | 40,318 | 82,112 | |
| 2000 | R | 32,868 | 35,620 | 73,206 | |
| 1996 | D | 35,961 | 22,885 | 70,517 | |
| 1992 | D | 29,485 | 24,218 | 80,444 | |
| 1988 | R | 28,429 | 34,912 | 63,754 | |
| 1984 | R | 24,445 | 40,403 | 65,054 | |
| 1980 | R | 26,519 | 28,869 | 62,793 | |
| 1976 | R | 24,672 | 29,016 | 55,613 | |
| 1972 | R | 18,552 | 30,186 | 48,749 | |
| 1968 | D | 24,327 | 20,011 | 44,999 | |
| 1964 | D | 28,766 | 14,449 | 43,232 | |
| 1960 | R | 19,175 | 28,459 | 47,634 | |
| 1956 | R | 8,568 | 27,806 | 36,374 | |
| 1952 | R | 11,222 | 24,614 | 35,885 | |
| 1948 | R | 10,705 | 16,367 | 27,315 | |
| 1944 | R | 13,292 | 16,934 | 30,264 | |
| 1940 | R | 14,757 | 18,674 | 33,471 | |
| 1936 | R | 9,732 | 19,077 | 31,368 | |
| 1932 | R | 13,058 | 18,987 | 32,317 | |
| 1928 | R | 9,114 | 21,750 | 30,960 | |
| 1924 | R | 3,618 | 15,081 | 20,128 | |
| 1920 | R | 6,110 | 14,145 | 20,398 | |
| 1916 | R | 7,294 | 7,324 | 14,823 | |
| 1912 | D | 5,093 | 3,367 | 14,082 | |
| 1908 | R | 3,525 | 7,336 | 11,110 | |
| 1904 | R | 2,225 | 7,013 | 9,523 | |
| 1900 | R | 3,615 | 6,873 | 10,761 | |
| 1896 | R | 4,031 | 8,414 | 12,668 | |
| 1892 | R | 4,516 | 6,571 | 11,781 | |
| 1888 | — | — | — | — | |
| 1884 | — | — | — | — | |
| 1880 | — | — | — | — | |
| 1876 | — | — | — | — |
Penobscot, anchored by Bangor, was a presidential battleground as recently as 2012 but has moved double digits toward Republicans over the past decade, reflecting broader realignment among rural and working-class voters across northern New England.
The Democratic margin in Penobscot County has rarely exceeded thirty-three points in modern history; the Republican margin has rarely exceeded fifty-seven points. 2024 delivered the county to the Republican candidate by eleven points.
Penobscot County's demographics resemble the country more than they resemble most counties. A 92% non-Hispanic-white share, a 14% poverty rate, and a median household income of $66,356 — all within the broad national range. The county's voting pattern over the last decade is most similar to that of Otsego County and Nelson County.
