| State: | Connecticut |
| District: | 12 |
| Chamber: | Senate |
| Representative: | Christine Cohen |
| Party: | Democratic |
| Residence: | Guilford |
Connecticut's 12th State Senate district elects one member of the Connecticut State Senate. The district consists of the towns of Branford, North Branford, Durham, Guilford, Killingworth, and Madison.[1] Its current senator is Christine Cohen. The district boundaries established after the 2010 census are the same as those established after the 2000 census.[2]
| Senator | Party | Years of service | Hometown | Notes | |||
|---|---|---|---|---|---|---|---|
| align=left nowrap | Charles Hawley[3] | Whig | 1830–1831 | Stamford | |||
| align=left nowrap | Thaddeus Betts | Whig | 1831–1832 | Norwalk | |||
| align=left nowrap | Charles Hawley | Whig | 1832–1836 | Stamford | |||
| align=left nowrap | Benjamin Isaacs | 1836–1837 | Norwalk | ||||
| align=left nowrap | Charles Hawley | Whig | 1837–1838 | Stamford | |||
| align=left nowrap | Thomas B. Butler | Whig | 1838–1840 | Norwalk | |||
| align=left nowrap | Joshua Ferris | Whig | 1840–1842 | Stamford | |||
| align=left nowrap | Clark Bissell | Whig | 1842–1844 | Norwalk | |||
| align=left nowrap | Darius Mead | 1844–1846 | Greenwich | ||||
| align=left nowrap | Charles Marvin | Whig | 1846–1848 | Wilton | |||
| align=left nowrap | Thomas B. Butler | Whig | 1848–1849 | Norwalk | Served as Senate President Pro Tempore | ||
| align=left nowrap | Joshua Ferris | Whig | 1849–1851 | Stamford | Served as Senate President Pro Tempore | ||
| align=left nowrap | Charles Marvin | Whig | 1851–1852 | Wilton | |||
| align=left nowrap | Thomas B. Butler | Whig | 1852–1854 | Norwalk | |||
| align=left nowrap | William T. Minor | Republican | 1854–1855 | Stamford | |||
| align=left nowrap | Orris S. Ferry | Republican | 1855–1857 | Norwalk | |||
| align=left nowrap | James H. Hoyt | Democratic | 1857–1858 | Stamford | |||
| align=left nowrap | Julius Curtis | Republican | 1858–1859 | Stamford | |||
| align=left nowrap | Matthew F. Merritt | 1859–1860 | Stamford | ||||
| align=left nowrap | Julius Curtis | Republican | 1860–1861 | Stamford | |||
| align=left nowrap | Aaron Homer Byington | Republican | 1861–1863 | Norwalk | |||
| align=left nowrap | Morgan Morgans | Whig | 1863–1865 | Stamford | |||
| align=left nowrap | Charles Ballard | 1865–1867 | Darien | ||||
| align=left nowrap | William C. Street | 1867–1869 | Norwalk | ||||
| align=left nowrap | Huested W. R. Hoyt | Republican | 1869–1870 | Greenwich | |||
| align=left nowrap | Elbert A. Woodward | Democratic | 1870–1871 | South Norwalk | Fled the country in 1871 due to charges stemming from the Tammany Hall corruption scandal | ||
| align=left nowrap | Asa Woodward | 1871–1873 | Norwalk | ||||
| align=left nowrap | Huested W. R. Hoyt | Republican | 1873–1874 | Greenwich | |||
| align=left nowrap | Galen A. Carter | Democratic | 1874–1875 | Stamford | |||
| align=left nowrap | Frederick Bruggerhof | Democratic | 1875–1877 | Darien | |||
| align=left nowrap | Oliver Hoyt | Republican | 1877–1882 | Stamford | Served as Senate President Pro Tempore | ||
| align=left nowrap | Edwin L. Scofield[4] | Republican | 1883–1884 | Stamford | |||
| align=left nowrap | R. Jay Walsh | Republican | 1885–1888 | Greenwich | Served as Senate President Pro Tempore | ||
| align=left nowrap | Benjamin P. Mead | Republican | 1889–1892 | New Canaan | |||
| align=left nowrap | Leander P. Jones | Republican | 1893–1894 | Greenwich | |||
| align=left nowrap | George E. Lounsbury | Republican | 1895–1896 | Ridgefield | |||
| align=left nowrap | Edwin O. Keeler | Republican | 1897–1900 | Norwalk | Served as Senate President Pro Tempore |
At this point redistricting caused Fairfield County to be represented in the Senate by the 25th and 26th district.
| Senators | Party | Years | District home | Note | |
|---|---|---|---|---|---|
| 1911–1912 | |||||
| . . . | |||||
| 1919–1920 | |||||
| 1921–1922 | |||||
| . . . | |||||
| 1931–1932 | |||||
| . . . | |||||
| 1939–1940 | |||||
| . . . | |||||
| 1943–1946 | |||||
| . . . | |||||
| 1961–1973 | |||||
| Stanley H. Page | 1973–1977 | ||||
| 1977–1979 | |||||
| Regina R. Smith | 1979–1985 | ||||
| Richard S. Eaton Sr. | 1985–1987 | ||||
| Thomas J. Sullivan, Jr. | 1987–1991 | ||||
| 1991–2005 | |||||
| 2005–2015 | |||||
| 2015–2019 | |||||
| 2019–present | |||||