One term senators.

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Since 1931:

Ohio:
1. A. Victor Donahey (D) served 1935-1941, retired, succeeded by Harold H. Burton (R)
2. Harold H. Burton (R) served 1941-1945, appointed to SCOTUS, replaced by James Huffman (D), who did not seek election for a full term
3. Kingsley Taft (R), served 1946-1947, elected to finish Burton's term, then retired, succeeded by John Bricker (R)
4. William Saxbe (R), served 1969-1974, resigned to become U.S. Attorney General

Oklahoma:
1. Edward Moore (R) served 1943-1949, retired, succeeded by Robert Kerr (D)
2. Dewey Bartlett (R) served 1973-1979, retited, succeeded by David Boren (D)

Oregon:
1. Alexander Barry (R), served 1938-1939, retired, succeeded by Rufus Holman (R)
2. Richard Neuberger (D), served 1955-1960, died, replaced by Hall Lusk (D), who did not seek election for a full term
3. Maurine Brown Neuberger (D), served 1960-1967, won election to finish her husband's term and reelected once, then retired, succeeded by Mark Hatfield (R)

Rhode Island:
J. Howard McGrath (D), served 1947-1949, resigned to become U.S. Attorney General, replaced by Edward Leahy (D), who did not seek election for a full term

South Dakota:
1. Harlan Bushfield (R), served 1943-1948, died, replaced by Vera Bushfield (R), who did not seek election for a full term
2. James Abourezk (D), served 1973-1979, retired, succeeded by Larry Pressler (R)

Texas:
Price Daniel (D), served 1953-1957, replaced by William Blakley (D), who did not seek election for a full term

Virginia:
1. William Scott (R), served 1973-1979, retired, succeeded by John Warner (R)
2. Paul Trible (R), served 1983-1989, retired, succeeded by Chuck Robb (D)
3. Jim Webb (D), served 2007-2013, retired, succeeded by Tim Kaine (D)

Washington:
1. Lewis Schwellenbach (D), served 1935-1940, resigned, succeeded by Monrad Wallgren (D)
2. Monrad Wallgren (D), served 1940-1945, resigned, replaced by Hugh Mitchell (D)
3. Daniel Evans (R), served 1983-1989, retired, succeeded by Slade Gorton (R)
4. Brock Admas (D), served 1987-1993, retired, succeeded by Patty Murray (D)

Wyoming:
1. Lester Hunt (D), served 1949-1954, died, replaced by Edward Crippa (R), who did not seek election for a full term
2. Milward Hinson (R), served 1962-1967, retired, succeeded by Clifford Hansen (R)