| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | D | 57,007 | 43,844 | 102,634 | |
| 2020 | D | 59,804 | 42,789 | 104,396 | |
| 2016 | D | 47,674 | 40,878 | 93,219 | |
| 2012 | D | 50,353 | 36,307 | 87,820 | |
| 2008 | D | 55,766 | 34,722 | 91,898 | |
| 2004 | D | 49,750 | 37,109 | 88,387 | |
| 2000 | D | 45,568 | 30,826 | 81,493 | |
| 1996 | D | 39,718 | 24,189 | 75,621 | |
| 1992 | D | 36,560 | 25,932 | 85,408 | |
| 1988 | R | 35,764 | 36,642 | 73,170 | |
| 1984 | R | 28,360 | 41,928 | 70,535 | |
| 1980 | R | 26,131 | 30,745 | 67,334 | |
| 1976 | R | 30,805 | 32,872 | 64,036 | |
| 1972 | R | 24,798 | 35,426 | 60,858 | |
| 1968 | D | 25,271 | 23,380 | 51,633 | |
| 1964 | D | 32,546 | 15,604 | 48,223 | |
| 1960 | D | 23,669 | 23,461 | 47,131 | |
| 1956 | R | 14,867 | 27,112 | 41,980 | |
| 1952 | R | 16,889 | 23,576 | 40,544 | |
| 1948 | R | 15,704 | 17,139 | 33,416 | |
| 1944 | R | 14,641 | 15,213 | 30,041 | |
| 1940 | R | 14,096 | 14,317 | 28,456 | |
| 1936 | D | 13,224 | 11,720 | 25,353 | |
| 1932 | R | 10,014 | 11,504 | 21,894 | |
| 1928 | R | 7,986 | 12,000 | 20,112 | |
| 1924 | R | 4,329 | 10,060 | 15,472 | |
| 1920 | R | 4,513 | 9,095 | 13,972 | |
| 1916 | R | 4,075 | 4,832 | 9,103 | |
| 1912 | D | 3,651 | 3,098 | 8,750 | |
| 1908 | R | 3,179 | 5,441 | 8,819 | |
| 1904 | R | 3,431 | 5,377 | 8,981 | |
| 1900 | R | 3,356 | 5,356 | 8,844 | |
| 1896 | R | 12,588 | 22,708 | 36,465 | |
| 1892 | — | — | — | — | |
| 1888 | R | 3,895 | 4,650 | 8,838 | |
| 1884 | R | 3,706 | 4,170 | 7,876 | |
| 1880 | R | 3,968 | 4,465 | 8,433 | |
| 1876 | R | 3,906 | 4,138 | 8,044 |
Lower Connecticut River Valley Planning Region sits in New England. Its political identity has been Democratic for as long as anyone now living can remember. 5 consecutive presidential elections in modern records have gone for the Democratic candidate, often by margins that would be considered landslide territory anywhere else.
The Democratic margin in Lower Connecticut River Valley Planning Region reached its widest at thirty-five points in 1964. The margin in 2024 was thirteen points — still decisive.
Lower Connecticut River Valley Planning Region's loyalty is rooted in its place. Median household income of $104,428, a 81% non-Hispanic-white share, and a population of 175,822 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 Southeastern Connecticut Planning Region and Washington County.