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.

The current dean of the Massachusetts delegation is Senator Ed Markey, having served as a Senator since 2013 and in Congress since 1976.

Article I of the United States Constitution allocated 8 seats to Massachusetts.

After the 1810 census, Massachusetts gained three seats to grow to its largest apportionment (so far).

In 1820/21, however, seven of those seats were lost to the new state of Maine.

Following the 1820 census, Massachusetts kept its remaining 13 seats without change.