Massachusetts's 12th congressional district is an obsolete district that was first active 1795–1803 in theDistrict of Maine and 1803–1843 inEastern Massachusetts. It was later active 1883–1893 inWestern Massachusetts and 1893–1983 in Eastern Massachusetts. It was most recently eliminated as a result of theredistricting cycle after the1980 census. Its lastcongressman wasGerry Studds, who wasredistricted into the10th district.

Notable persons elected to theU.S. House of Representatives from the 12th congressional district includeJohn Quincy Adams, following his term as president, andJames Michael Curley, four-timeMayor of Boston.

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Suffolk County: Boston Wards 13, 14, 15, 16, 17, 20, 24.^[1]

Boston (Wards 9, 10, 11, 12, 17, 18, 19, 20, 21).^[2]

Boston (Wards 6, 7, 8, 9, 11, 13, 14, 15, 16, 17).^[3]

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Representative (District home)	Party	Years	Cong ress	Electoral history	District location
District created March 4, 1795
Henry Dearborn (Gardiner)	Democratic-Republican	March 4, 1795 – March 3, 1797	4th	Redistricted from the4th district andre-elected in 1795. Lost re-election.	1795–1803 "1st Eastern district,"District of Maine
Isaac Parker (Castine)	Federalist	March 4, 1797 – March 3, 1799	5th	Elected in 1797 on the third ballot. Retired.
Silas Lee (Wiscasset)	Federalist	March 4, 1799 – August 20, 1801	6th 7th	Elected in 1798. Re-elected in 1800. Resigned.
Vacant		August 20, 1801 – December 6, 1802	7th
Samuel Thatcher (Warren)	Federalist	December 6, 1802 – March 3, 1803		Elected July 29, 1802 on the fifth ballot to finish Lee's term and seated December 6, 1802.[4] Redistricted to the16th district.
Thomson J. Skinner (Williamstown)	Democratic-Republican	March 4, 1803 – August 10, 1804	8th	Elected in 1802. Resigned.	1803–1815 "Berkshire district"
Vacant		August 10, 1804 – November 5, 1804
Simon Larned (Pittsfield)	Democratic-Republican	November 5, 1804 – March 3, 1805		Elected September 17, 1804 to finish Skinner's term and seated November 5, 1804.[5] Retired.
Barnabas Bidwell (Stockbridge)	Democratic-Republican	March 4, 1805 – July 13, 1807	9th 10th	Elected in 1804. Re-elected in 1806. Resigned to becomeMassachusetts Attorney General.
Vacant		July 13, 1807 – November 2, 1807	10th
Ezekiel Bacon (Pittsfield)	Democratic-Republican	November 2, 1807 – March 3, 1813	10th 11th 12th	Elected sometime in 1807 to finish Bidwell's term and seated November 2, 1807.[6] Re-elected in 1808. Re-elected in 1810. Retired.
Daniel Dewey (Williamstown)	Federalist	March 4, 1813 – February 24, 1814	13th	Elected in 1812. Resigned to become Justice of theMassachusetts Supreme Judicial Court.
Vacant		February 24, 1814 – September 26, 1814
John W. Hulbert (Pittsfield)	Federalist	September 26, 1814 – March 3, 1815		Elected August 4, 1814 to finish Dewey's term and seated September 26, 1814.[7] Redistricted to the7th district.
Solomon Strong (Westminster)	Federalist	March 4, 1815 – March 3, 1819	14th 15th	Elected in 1814. Re-elected in 1816. Retired.	1815–1823 "Worcester North district"
Jonas Kendall (Leominster)	Federalist	March 4, 1819 – March 3, 1821	16th	Elected in 1818. Lost re-election.
Lewis Bigelow (Petersham)	Federalist	March 4, 1821 – March 3, 1823	17th	Elected in 1820. Lost re-election.
Francis Baylies (Taunton)	Jackson Federalist	March 4, 1823 – March 3, 1825	18th 19th	Redistricted from the10th district andre-elected in 1822. Re-elected in 1825 on the second ballot. Lost re-election.	1823–1833 "Bristol district"
	Jacksonian	March 4, 1825 – March 3, 1827
James L. Hodges (Taunton)	Anti-Jacksonian	March 4, 1827 – March 3, 1833	20th 21st 22nd	Elected in 1827 on the third ballot. Re-elected in 1828. Re-elected in 1832. Retired.
John Quincy Adams (Quincy)	Anti-Masonic	March 4, 1833 – March 3, 1837	23rd 24th 25th 26th 27th	Redistricted from the11th district andre-elected in 1833. Re-elected in 1834. Re-elected in 1836. Re-elected in 1838. Re-elected in 1840. Redistricted to the8th district.	1833–1843 [data missing]
	Whig	March 4, 1837 – March 3, 1843
District eliminated March 3, 1843
District re-created March 4, 1883
George D. Robinson (Chicopee)	Republican	March 4, 1883 – January 7, 1884	48th	Redistricted from the11th district andre-elected in 1882. Resigned to becomeGovernor of Massachusetts.	1883–1893 [data missing]
Vacant		January 7, 1884 – January 17, 1884
Francis W. Rockwell (Pittsfield)	Republican	January 17, 1884 – March 3, 1891	48th 49th 50th 51st	Elected to finish Robinson's term Re-elected in 1884. Re-elected in 1886. Re-elected in 1888. Lost re-election.
John C. Crosby (Pittsfield)	Democratic	March 4, 1891 – March 3, 1893	52nd	Elected in 1890. Lost re-election.
Elijah A. Morse (Canton)	Republican	March 4, 1893 – March 3, 1897	53rd 54th	Redistricted from the2nd district andre-elected in 1892. Re-elected in 1894. Retired.	1893–1903 [data missing]
William C. Lovering (Taunton)	Republican	March 4, 1897 – March 3, 1903	55th 56th 57th[8]	Elected in 1896. Re-elected in 1898. Re-elected in 1900. Redistricted to the14th district.
Samuel Leland Powers (Newton)	Republican	March 4, 1903 – March 3, 1905	58th[9]	Redistricted from the11th district andre-elected in 1902. Retired.	1903–1913 [data missing]
John W. Weeks (Newton)	Republican	March 4, 1905 – March 3, 1913	59th 60th 61st 62nd[10]	Elected in 1904. Re-elected in 1906. Re-elected in 1908. Re-elected in 1910. Redistricted to the13th district.
James Michael Curley (Boston)	Democratic	March 4, 1913 – February 4, 1914	63rd	Redistricted from the10th district andre-elected in 1912. Resigned to becomeMayor of Boston.	1913–1933 [data missing]
Vacant		February 4, 1914 – April 7, 1914
James A. Gallivan (Boston)	Democratic	April 7, 1914 – April 3, 1928	63rd 64th 65th 66th 67th 68th 69th 70th	Elected to finish Curley's term. Re-elected in 1914. Re-elected in 1916. Re-elected in 1918. Re-elected in 1920. Re-elected in 1922. Re-elected in 1924. Re-elected in 1926. Died.
Vacant		April 3, 1928 – November 6, 1928	70th
John W. McCormack (Boston)	Democratic	November 6, 1928 – January 3, 1963	70th 71st 72nd 73rd 74th 75th 76th 77th 78th 79th 80th 81st 82nd 83rd 84th 85th 86th 87th	Elected to finish Gallivan's term. Re-elected in 1928. Re-elected in 1930. Re-elected in 1932. Re-elected in 1934. Re-elected in 1936. Re-elected in 1938. Re-elected in 1940. Re-elected in 1942. Re-elected in 1944. Re-elected in 1946. Re-elected in 1948. Re-elected in 1950. Re-elected in 1952. Re-elected in 1954. Re-elected in 1956. Re-elected in 1958. Re-elected in 1960. Redistricted to the9th district.
					1933–1943 [data missing]
					1943–1953 [data missing]
					1953–1963 [data missing]
Hastings Keith (West Bridgewater)	Republican	January 3, 1963 – January 3, 1973	88th 89th 90th 91st 92nd	Redistricted from the9th district andre-elected in 1962. Re-elected in 1964. Re-elected in 1966. Re-elected in 1968. Re-elected in 1970. [data missing]	1963–1973 [data missing]
Gerry Studds (Cohasset)	Democratic	January 3, 1973 – January 3, 1983	93rd 94th 95th 96th 97th	Elected in 1972 Re-elected in 1974. Re-elected in 1976. Re-elected in 1978. Re-elected in 1980. Redistricted to the10th district.	1973–1983 [data missing]
District eliminated January 3, 1983

• Martis, Kenneth C. (1989).The Historical Atlas of Political Parties in the United States Congress. New York: Macmillan Publishing Company.
• Martis, Kenneth C. (1982).The Historical Atlas of United States Congressional Districts. New York: Macmillan Publishing Company.
• Congressional Biographical Directory of the United States 1774–present
• "Our Campaigns - United States - Massachusetts - MA - District 12".www.ourcampaigns.com. RetrievedDecember 31, 2020.

• Congressional districts of Massachusetts
• Former congressional districts of the United States
• 1983 disestablishments in Massachusetts
• Constituencies established in 1795
• Constituencies disestablished in 1983
• 1795 establishments in Massachusetts

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