United States congressional delegations from Massachusetts

These are tables of congressional delegations from Massachusetts to the United States House of Representatives and the United States Senate.

List of members of the Massachusetts United States House delegation, their terms in office, district boundaries, and the district political ratings according to the CPVI. The delegation has a total of 9 members, all of whom are members of the Democratic party.

Article I of the United States Constitution allocated 8 seats to Massachusetts. After the 1790 Census, Massachusetts had 14 seats. From 1793 to 1795, Massachusetts apportioned 13 of its 14 seats into 4 districts, elected on a general ticket; the remaining seat was elected At-large. In 1795, Massachusetts returned to single-representative districts, abolishing the at-large district and plural districts.

As of September 2015^[update], there are four living former U.S. Senators from Massachusetts, two from Class 1 and two from Class 2.

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