| Alabama | Howell Heflin | Democratic | Retired: Republican victory | Jeff Sessions (Republican) 52.5% Roger Bedford (Democratic) 45.5% Mark Thornton (Libertarian) 1.4% Charles R. Hebner (Natural Law) 0.6% |
| Alaska | Ted Stevens | Republican | Re-elected, 76.7% | Jeff Whittaker (Green) 12.5% Theresa Obermeyer (Democratic) 10.3% |
| Arkansas | David Pryor | Democratic | Retired: Republican victory | Tim Hutchinson (Republican) 52.7% Winston Bryant (Democratic) 47.3% |
| Colorado | Hank Brown | Republican | Retired: Republican victory | Wayne Allard (Republican) 51.4% Tom Strickland (Democratic) 45.7% Randy MacKenzie (Natural Law) 2.9% |
| Delaware | Joe Biden | Democratic | Re-elected, 60% | Raymond J. Clatworthy (Republican) 38.1% Mark Jones (Libertarian) 1.2% Jacqueline Kossoff (Natural Law) 0.6% |
| Georgia | Sam Nunn | Democratic | Retired: Democratic victory | Max Cleland (Democratic) 48.9% Guy Millner (Republican) 47.5% John Gregory Cashin (Libertarian) 3.6% |
| Idaho | Larry E. Craig | Republican | Re-elected, 57.0% | Walt Minnick (Democratic) 39.9% Mary J. Charbonneau (Independent) 2.0% Susan Vegors (Natural Law) 1.0% |
| Illinois | Paul Simon | Democratic | Retired: Democratic victory | Richard J. Durbin (Democratic) 56.1% Al Salvi (Republican) 40.7% Steven H. Perry (Reform) 1.4% Robin J. Miller (Libertarian) 1% Chad Koppie (U.S. Taxpayers) 0.4% James E. Davis (Natural Law) 0.3% |
| Iowa | Tom Harkin | Democratic | Re-elected, 51.8% | Jim Ross Lightfoot (Republican) 46.7% Sue Atkinson (Independent) 0.8% Fred Gratzon (Natural Law) 0.3% Joe Sulentic (Independent) 0.2% Shirley E. Pena (Socialist Workers) 0.2% |
| Kansas | Nancy Kassebaum | Republican | Retired: Republican victory | Pat Roberts (Republican) 62.0% Sally Thompson (Democratic) 34.4% Mark S. Marney (Reform) 2.3% Steven Rosile (Libertarian) 1.2% |
| Kansas1 | Sheila Frahm | Republican | Defeated in Primary: Republican victory | Sam Brownback (Republican) 53.9% Jill Docking (Democratic) 43.3% Donald R. Klaassen (Reform) 2.8% |
| Kentucky | Mitch McConnell | Republican | Re-elected, 55.5% | Steve Beshear (Democratic) 42.8% Dennis L. Lacy (Libertarian) 0.7% Patricia Jo Metten (Natural Law) 0.6% Mac McElroy (U.S. Taxpayers) 0.4% |
| Louisiana | Bennett Johnston Jr. | Democratic | Retired: Democratic victory | Mary Landrieu (Democratic) 50.1% Woody Jenkins (Republican) 49.9% |
| Maine | William Cohen | Republican | Retired: Republican victory | Susan M. Collins (Republican) 49.2% Joe Brennan (Democratic) 43.8% John Rensenbrink (Green) 4% William P. Clarke (U.S. Taxpayers) 3% |
| Massachusetts | John Kerry | Democratic | Re-elected, 52.2% | William Weld (Republican) 44.7% Susan Gallagher (Conservative) 2.7% Robert Stowe (Natural Law) 0.3% |
| Michigan | Carl Levin | Democratic | Re-elected, 58.4% | Ronna Romney (Republican) 39.9% Kenneth L. Proctor (Libertarian) 1.0% William Roundtree (Workers World) 0.3% Joseph S. Mattingly (Natural Law) 0.3% Martin P. McLaughlin (Socialist Equality) 0.2% |
| Minnesota | Paul Wellstone | Democratic (DFL) | Re-elected, 50.3% | Rudy Boschwitz (Republican) 41.3% Dean Barkley (Reform) 7% Tim Davis (Grass Roots) 0.6% Roy Ezra Carlton (Libertarian) 0.2% Steve Johnson (Natural Law) 0.2% Thomas A. Fiske (Socialist Workers) 0.1% |
| Mississippi | Thad Cochran | Republican | Re-elected, 71.0% | James Hunt (Democratic) 27.4% Ted Weill (Independence) 1.6% |
| Montana | Max Baucus | Democratic | Re-elected, 49.5% | Dennis Rehberg (Republican) 44.7% Becky Shaw (Reform) 4.7% Stephen Heaton (Natural Law) 1% |
| Nebraska | J. James Exon | Democratic | Retired: Republican victory | Chuck Hagel (Republican) 57.4% Ben Nelson (Democratic) 42.6% |
| New Hampshire | Bob Smith | Republican | Re-elected, 49.3% | Dick Swett (Democratic) 46.2% Ken Blevens (Libertarian) 4.5% |
| New Jersey | Bill Bradley | Democratic | Retired: Democratic victory | Robert Torricelli (Democratic) 52.7% Dick Zimmer (Republican) 42.5% Richard J. Pezzullo (Independent) 1.8% Mary Jo Christian (Independent) 0.8% Paul A. Woomer (Independent) 0.5% Olga L. Rodriguez (Independent) 0.5% Mark Wise (Independent) 0.5% Wilburt Kornegay (Independent) 0.4% Steven J. Baeli (Independent) 0.3% |
| New Mexico | Pete Domenici | Republican | Re-elected, 64.7% | Art Trujillo (Democratic) 29.8% Abraham Guttman (Green) 4.4% Bruce M. Bush (Libertarian) 1.1% |
| North Carolina | Jesse Helms | Republican | Re-elected, 52.6% | Harvey Gantt (Democratic) 45.9% Ray Ubinger (Libertarian) 1.0% J. Victor Pardo (Natural Law) 0.4% |
| Oklahoma | Jim Inhofe | Republican | Re-elected, 56.7% | James Boren (Democratic) 40.1% Bill Maguire (Independent) 1.3% Agnes Marie Regier (Libertarian) 1.2% Chris Nedbalek (Independent) 0.7% |
| Oregon | Mark Hatfield | Republican | Retired: Republican victory | Gordon H. Smith (Republican) 49.8% Tom Bruggere (Democratic) 45.9% Brent Thompson (Reform) 1.5% Gary Kutcher (Green) 1.0% Paul Mohn (Libertarian) 0.9% Christopher Phelps (Socialist) 0.4% Michael L. Hoyes (Natural Law) 0.3% |
| Rhode Island | Claiborne Pell | Democratic | Retired: Democratic victory | John F. Reed (Democratic) 63.3% Nancy Mayer (Republican) 35% Donald W. Lovejoy (Independent) 1.7% |
| South Carolina | Strom Thurmond | Republican | Re-elected, 53.4% | Elliot Close (Democratic) 44.0% Richard T. Quillian (Libertarian) 1.1% Peter J. Ashy (Reform) 0.8% Annette C. Estes (Natural Law) 0.7% |
| South Dakota | Larry Pressler | Republican | Defeated, 48.7% | Tim Johnson (Democratic) 51.3% |
| Tennessee | Fred Thompson | Republican | Re-elected, 61.4% | Houston Gordon (Democratic) 36.8% John Jay Hooker (Independent) 0.8% Bruce Gold (Independent) 0.3% Robert O. Watson (Independent) 0.3% Greg Samples (Independent) 0.2% Philip L. Kienlen (Independent) 0.1% |
| Texas | Phil Gramm | Republican | Re-elected, 54.8% | Victor Morales (Democratic) 43.9% Michael Bird (Libertarian) 0.9% John Huff (Natural Law) 0.4% |
| Virginia | John Warner | Republican | Re-elected, 52.5% | Mark Warner (Democratic) 47.4% |
| West Virginia | Jay Rockefeller | Democratic | Re-elected, 76.6% | Betty Burkes (Republican) 23.4% |
| Wyoming | Alan K. Simpson | Republican | Retired: Republican victory | Michael B. Enzi (Republican) 54.1% Joyce Jansa Corcoran (Democratic) 42.2% W. David Herbert (Libertarian) 2.5% Lloyd Marsden (Natural Law) 1.2% |