Six members of the United States House of Representatives were elected in special elections in 1963.
|California 1||Vacant||Rep. Clement W. Miller died during previous congress. |
New member elected January 22, 1963.
|√ Donald H. Clausen (Republican)|
|California 23||Clyde Doyle||Democratic||Incumbent died March 14, 1963. |
New member elected June 11, 1963.
|√ Del M. Clawson (Republican)|
|Pennsylvania 15||Francis E. Walter||Democratic||Incumbent died May 31, 1963. |
New member elected July 30, 1963.
|√ Fred B. Rooney (Democratic)|
|North Dakota 1||Hjalmar C. Nygaard||Republican||Incumbent died July 18, 1963. |
New member elected October 22, 1963.
|√ Mark Andrews (Republican)|
|Pennsylvania 23||Leon H. Gavin||Republican||Incumbent died September 15, 1963. |
New member elected November 3, 1963.
|√ Albert W. Johnson (Republican)|
|Texas 10||Homer Thornberry||Democratic||Incumbent resigned December 20, 1963 to become judge of the United States District Court for the Western District of Texas. |
New member elected December 21, 1963.
|√ J. J. Pickle (Democratic)|
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