Massachusetts sent 10 Democrats and 2 Republicans to the US House in 1978.

12 districts. Each row shows the winning party, margin, and member elected. Vote counts are the certified district totals.

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Massachusetts — 1978 House districts

Source: MIT Election Data + Science Lab, US House returns (party-classified by literal ballot party).

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District	Won	Margin	Member elected	Votes
MA-01	R	−99.9%	Silvio Conte	131,918
MA-02	D	+45.7%	Edward P Boland	139,479
MA-03	D	+50.4%	Joseph D Early	158,730
MA-04	D	+99.9%	Robert F Drinan	111,491
MA-05	D	+24.0%	James M Shannon	172,681
MA-06	D	+7.5%	Nicholas Mavroules	180,645
MA-07	D	+84.8%	Edward J Markey	171,646
MA-08	D	+53.7%	Thomas P O'Neill JR	136,928
MA-09	D	+91.8%	John J Moakley	116,338
MA-10	R	−22.3%	Margaret Heckler	166,957
MA-11	D	+91.7%	Brian J Donnelly	145,722
MA-12	D	+99.9%	Gerry E Studds	176,859