1978 United States House of Representatives elections

382 incumbent members sought reelection, but 5 were defeated in primaries and 19 defeated in the general election for a total of 358 incumbents winning. Source: Election Statistics - Office of the Clerk == Special elections ==

The seven incumbents were all automatically re-elected when no opponents filed to run against them in the Sept. 16 jungle primary. They did not appear on the ballot. Leach and Wilson were the top two finishers in the 4th District's jungle primary and advanced to the Nov. 7 general election. == Maine ==

• Les Aspin (Democratic) 54.5% • William W. Petrie (Republican) 45.5% }} • Robert Kastenmeier (Democratic) 57.7% • James A. Wright (Republican) 41.3% • Dick G. Fields (Independent) 1.0% }} • Alvin Baldus (Democratic) 62.8% • Michael Steven Ellis (Republican) 37.2% }} • Clement J. Zablocki (Democratic) 66.1% • Elroy C. Honadel (Republican) 33.9% }} • Henry S. Reuss (Democratic) 73.1% • James R. W. Medina (Republican) 25.9% • Paul Greenberg (Independent) 0.7% • John Edward Sokoly (Independent) 0.3% }} • William A. Steiger (Republican) 69.6% • Robert J. Steffes (Democratic) 29.6% • Gordon Ponschock (Con) 0.8% }} • Dave Obey (Democratic) 62.2% • Vinton A. Vesta (Republican) 36.9% • George Olishkewych (Con) 0.9% }} • Toby Roth (Republican) 57.9% • Robert John Cornell (Democratic) 42.1% }} • Jim Sensenbrenner (Republican) 61.2% • Matthew J. Flynn (Democratic) 38.8% }} == Wyoming ==