Ohio sent 10 Democrats and 13 Republicans to the US House in 1978.

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

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Ohio — 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
OH-01	R	−30.6%	Willis D Gradison JR	114,169
OH-02	D	+4.7%	Thomas A Luken	123,238
OH-03	D	+9.4%	Tony P Hall	116,804
OH-04	R	−37.0%	Tennyson Guyer	124,935
OH-05	R	−25.2%	Delbert Latta	136,618
OH-06	R	−29.8%	William H Harsha	131,910
OH-07	R	−100.0%	Clarence J Brown	92,507
OH-08	R	−42.8%	Thomas N Kindness	113,652
OH-09	D	+33.0%	Thomas Ludlow Ashley	113,128
OH-10	R	−47.8%	Clarence E Miller	134,368
OH-11	R	−39.8%	J William Stanton	131,181
OH-12	R	−13.9%	Samuel L Devine	143,271
OH-13	D	+30.3%	Donald J Pease	124,144
OH-14	D	+44.9%	John F Seiberling	113,667
OH-15	R	−42.2%	Chalmers P Wylie	128,023
OH-16	R	−56.0%	Ralph S Regula	134,792
OH-17	R	−34.8%	John M Ashbrook	129,127
OH-18	D	+19.0%	Douglas Applegate	120,825
OH-19	R	−1.3%	Lyle Williams	141,867
OH-20	D	+100.0%	Mary Rose Oaker	76,973
OH-21	D	+72.2%	Louis Stokes	68,467
OH-22	D	+42.7%	Charles A Vanik	132,572
OH-23	D	+49.5%	Ronald M Mottl	133,707