| Year | Won | Margin | Democratic | Republican | Total |
|---|---|---|---|---|---|
| 2024 | D | 144,287 | 112,959 | 262,234 | |
| 2020 | D | 159,869 | 111,942 | 275,409 | |
| 2016 | D | 135,476 | 104,797 | 249,727 | |
| 2012 | D | 144,298 | 91,168 | 237,902 | |
| 2008 | D | 153,912 | 95,310 | 252,284 | |
| 2004 | D | 131,161 | 105,681 | 241,416 | |
| 2000 | D | 130,415 | 80,991 | 224,750 | |
| 1996 | D | 117,497 | 70,262 | 214,730 | |
| 1992 | D | 106,329 | 93,079 | 253,763 | |
| 1988 | R | 107,502 | 114,814 | 225,582 | |
| 1984 | R | 92,869 | 139,796 | 233,720 | |
| 1980 | R | 86,259 | 111,379 | 222,532 | |
| 1976 | R | 103,712 | 114,874 | 220,197 | |
| 1972 | R | 89,038 | 132,319 | 224,239 | |
| 1968 | D | 105,195 | 85,987 | 207,179 | |
| 1964 | D | 144,130 | 64,346 | 208,588 | |
| 1960 | D | 124,325 | 90,172 | 214,498 | |
| 1956 | R | 73,934 | 125,992 | 199,925 | |
| 1952 | R | 89,924 | 109,323 | 200,003 | |
| 1948 | D | 80,116 | 79,575 | 164,061 | |
| 1944 | D | 81,341 | 71,743 | 154,277 | |
| 1940 | D | 83,069 | 67,933 | 151,342 | |
| 1936 | D | 77,294 | 50,481 | 134,818 | |
| 1932 | D | 57,210 | 52,066 | 114,742 | |
| 1928 | D | 54,463 | 53,339 | 108,750 | |
| 1924 | R | 23,883 | 45,572 | 79,395 | |
| 1920 | R | 25,023 | 43,447 | 72,132 | |
| 1916 | D | 20,041 | 19,882 | 41,699 | |
| 1912 | D | 14,736 | 12,643 | 37,021 | |
| 1908 | R | 14,755 | 21,285 | 37,837 | |
| 1904 | R | 14,327 | 20,863 | 37,274 | |
| 1900 | R | 16,704 | 18,295 | 35,742 | |
| 1896 | R | 1,270 | 3,573 | 5,016 | |
| 1892 | — | — | — | — | |
| 1888 | D | 14,570 | 12,521 | 27,732 | |
| 1884 | D | 12,744 | 10,757 | 23,500 | |
| 1880 | D | 11,790 | 10,353 | 22,144 | |
| 1876 | D | 10,297 | 8,684 | 18,981 |
South Central Connecticut Planning Region is a political anchor of New England. Its population of 570,598 and its concentration of urban, diverse, and college-educated voters have made it a Democratic stronghold for decades running.
The Democratic margin in South Central Connecticut Planning Region has been steady. It reached its modern peak at thirty-eight points in 1964; the 2024 margin was twelve points, still in line with the county's long pattern.
South Central Connecticut Planning Region's political identity is inseparable from its demographic profile: a 62% non-Hispanic-white share, a median household income of $88,197, and the full diversity of a major metropolitan center. The county's voting pattern resembles other major urban centers most closely — Naugatuck Valley Planning Region and Middlesex County.
