| Alabama | Howell Heflin | Democratic | Re-elected, 62.7% | Albert L. Smith, Jr. (Republican) 36.4%
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| Alaska | Ted Stevens | Republican | Re-elected, 71.2% | John E. Havelock (Democratic) 28.5% |
| Arkansas | David Pryor | Democratic | Re-elected, 57.3% | Ed Bethune (Republican) 42.7% |
| Colorado | William L. Armstrong | Republican | Re-elected, 64.2% | Nancy E. Dick (Democratic) 34.6% |
| Delaware | Joe Biden | Democratic | Re-elected, 60.1% | John M. Burris (Republican) 39.1% |
| Georgia | Sam Nunn | Democratic | Re-elected, 79.9% | Jon M. Hicks (Republican) 20.1% |
| Idaho | James A. McClure | Republican | Re-elected, 72.2% | Peter M. Busch (Democratic) 26.0%
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| Illinois | Charles H. Percy | Republican | Defeated, 48.2% | Paul Simon (Democratic) 50.1% |
| Iowa | Roger Jepsen | Republican | Defeated, 43.7% | Tom Harkin (Democratic) 55.5%
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| Kansas | Nancy Landon Kassebaum | Republican | Re-elected, 76.0% | James R. Maher (Democratic) 21.2% |
| Kentucky | Walter Huddleston | Democratic | Defeated, 49.5% | Mitch McConnell (Republican) 49.9% |
| Louisiana | Bennett Johnston Jr. | Democratic | Re-elected in primary |
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| Maine | William Cohen | Republican | Re-elected, 73.3% | Elizabeth H. Mitchell (Democratic) 25.9%
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| Massachusetts | Paul Tsongas | Democratic | Retired, Democratic victory | John Kerry (Democratic) 55.1% Ray Shamie (Republican) 44.9% |
| Michigan | Carl Levin | Democratic | Re-elected, 51.8% | Jack R. Lousma (Republican) 47.2% |
| Minnesota | Rudy Boschwitz | Republican | Re-elected, 58.1% | Joan Growe (Democratic) 41.3% |
| Mississippi | Thad Cochran | Republican | Re-elected, 60.9% | William Winter (Democratic) 39.1% |
| Montana | Max Baucus | Democratic | Re-elected, 56.9% | Chuck Cozzens (Republican) 40.7% |
| Nebraska | J. James Exon | Democratic | Re-elected, 51.9% | Nancy Hoch (Republican) 48.0% |
| New Hampshire | Gordon J. Humphrey | Republican | Re-elected, 58.7% | Norman D'Amours (Democratic) 41.0% |
| New Jersey | Bill Bradley | Democratic | Re-elected, 64.2% | Mary V. Mochary (Republican) 35.2% |
| New Mexico | Pete Domenici | Republican | Re-elected, 71.9% | Judith A. Pratt (Democratic) 28.1% |
| North Carolina | Jesse Helms | Republican | Re-elected, 51.7% | Jim Hunt (Democratic) 47.8% |
| Oklahoma | David L. Boren | Democratic | Re-elected, 75.6% | Will E. Crozier (Republican) 23.4% |
| Oregon | Mark Hatfield | Republican | Re-elected, 66.5% | Margie Hendrickson (Democratic) 33.4% |
| Rhode Island | Claiborne Pell | Democratic | Re-elected, 72.6% | Barbara Leonard (Republican) 27.4% |
| South Carolina | Strom Thurmond | Republican | Re-elected, 66.8% | Melvin Purvis, Jr. (Democratic) 31.8% |
| South Dakota | Larry Pressler | Republican | Re-elected, 74.5% | George V. Cunningham (Democratic) 25.5% |
| Tennessee | Howard Baker | Republican | Retired, Democratic victory | Al Gore (Democratic) 60.7% Victor Ashe (Republican) 33.8% |
| Texas | John Tower | Republican | Retired, Republican victory | Phil Gramm (Republican) 58.5% Lloyd Doggett (Democratic) 41.4% |
| Virginia | John Warner | Republican | Re-elected, 70.0% | Edythe C. Harrison (Democratic) 29.9% |
| West Virginia | Jennings Randolph | Democratic | Retired, Democratic victory | Jay Rockefeller (Democratic) 51.8% John Raese (Republican) 47.7% |
| Wyoming | Alan K. Simpson | Republican | Re-elected, 78.3% | Victor A. Ryan (Democratic) 21.7% |