State
| Incumbent
| Party
| Status
| Candidates
|
| Alabama | Jeff Sessions | Republican | Re-elected, 58.6% | Susan Parker (Democrat) 39.8% Jeff Allen (Libertarian) 1.5% |
| Alaska | Ted Stevens | Republican | Re-elected, 78% | Frank J. Vondersaar (Democrat) 11% Jim Sykes (Green) 8% Jim Dore (AI) 3% Leonard Karpinski (Libertarian) 1% |
| Arkansas | Tim Hutchinson | Republican | Defeated, 46.1% | Mark Pryor (Democrat) 53.9% |
| Colorado | Wayne Allard | Republican | Re-elected, 50.7% | Tom Strickland (Democrat) 45.8% Douglas “Dayhorse” Campbell (Constitution) 1.5% Rick Stanley (Libertarian) 1.5% John Heckman (Concerns of People) 0.5% |
| Delaware | Joe Biden | Democratic | Re-elected, 58.2% | Raymond J. Clatworthy (Republican) 40.8% Maurice Barros (IPD) 0.4% Raymond T. Buranello (Libertarian) 0.4% Robert E. Mattson (Natural Law) 0.2% |
| Georgia | Max Cleland | Democratic | Defeated, 45.9% | Saxby Chambliss (Republican) 52.7% Claude Thomas (Libertarian) 1.4% |
| Idaho | Larry Craig | Republican | Re-elected, 65% | Alan Blinken (Democrat) 33% Donovan Bramwell (Libertarian) 2% |
| Illinois | Richard Durbin | Democratic | Re-elected, 60.3% | Jim Durkin (Republican) 38% Steven Burgauer (Libertarian) 1.6% |
| Iowa | Tom Harkin | Democratic | Re-elected, 54.2% | Greg Ganske (Republican) 43.8% Tim Harthan (Green) 1.1% Richard J. Moore (Libertarian) 0.9% |
| Kansas | Pat Roberts | Republican | Re-elected, 82.5% | Steven A. Rosile (Libertarian) 9.1% George Cook (Reform) 8.4% |
| Kentucky | Mitch McConnell | Republican | Re-elected, 64.7% | Lois Combs Weinberg (Democrat) 35.3% |
| Louisiana | Mary Landrieu | Democratic | Re-elected in runoff, 51.7% | Suzanne Haik Terrell (Republican) 48.3% |
| Maine | Susan Collins | Republican | Re-elected, 58.4% | Chellie Pingree (Democrat) 41.6% |
| Massachusetts | John Kerry | Democratic | Re-elected, 72.3% | Michael E. Cloud (Libertarian) 16.6% Blank/Scattering 9.6% Randall Forsberg, Write-in 1.1% Other 0.3% |
| Michigan | Carl Levin | Democratic | Re-elected, 60.6% | Andrew Raczkowski (Republican) 37.9% Eric Borregard (Green) 0.8% John S. Mangopoulos (Reform) 0.4% Doug Dern (Natural Law) 0.3% |
| Minnesota | Paul Wellstone | Democratic-Farmer-Labor | Deceased: Republican victory | Norm Coleman (Republican) 49.5% Walter Mondale (DFL) 47.3% Jim Moore (Independence) 2% Paul Wellstone (DFL) 0.5% Ray Tricomo (Green) 0.4% Miro Drago Kovatchevich (Constitution) 0.1% |
| Mississippi | Thad Cochran | Republican | Re-elected, 85.6% | Shawn O'Hara (Reform) 15.4% |
| Missouri1 | Jean Carnahan | Democratic | Defeated, 48.7% | Jim Talent (Republican) 49.8% Tamara A. Millay (Libertarian) 1% Daniel Romano (Green) 0.6% |
| Montana | Max Baucus | Democratic | Re-elected, 62.7% | Mike Taylor (Republican) 31.7% Stan Jones (Libertarian) 3.2% Bob Kelleher (Green) 2.3% |
| Nebraska | Chuck Hagel | Republican | Re-elected, 82.8% | Charlie A. Matulka (Democrat) 14.6% John J. Graziano (Libertarian) 1.5% Phil Chase (Independent) 1.1% |
| New Hampshire | Bob Smith | Republican | Defeated in primary: Republican victory | John E. Sununu (Republican) 50.8% Jeanne Shaheen (Democrat) 46.4% Ken Blevens (Libertarian) 2.2% |
| New Jersey | Robert Torricelli | Democratic | Withdrew: Democratic victory | Frank Lautenberg (Democrat) 53.9% Doug Forrester (Republican) 44% Ted Glick (Green) 1.2% Elizabeth Macron (Libertarian) 0.6% Norman E. Wahner (NJ Conservative) 0.3% Gregory Pason (Socialist) 0.1% |
| New Mexico | Pete Domenici | Republican | Re-elected, 65% | Gloria Tristani (Democrat) 35% |
| North Carolina | Jesse Helms | Republican | Retired: Republican victory | Elizabeth Dole (Republican) 53.6% Erskine Bowles (Democrat) 45% Sean Haugh (Libertarian) 1.5% |
| Oklahoma | Jim Inhofe | Republican | Re-elected, 57.3% | David Walters (Democrat) 36.3% James Germalic (Independent) 6.4% |
| Oregon | Gordon Smith | Republican | Re-elected, 56.2% | Bill Bradbury (Democrat) 39.6% Dan Fitzgerald (Libertarian) 2.4% Lon Mabon (Constitution) 1.7% |
| Rhode Island | Jack Reed | Democratic | Re-elected, 78.4% | Robert Tingle (Republican) 21.6% |
| South Carolina | Strom Thurmond | Republican | Retired: Republican victory | Lindsey Graham (Republican) 54.4% Alex Sanders (Democrat) 44.2% Ted Adams (Constitution) 0.8% Victor Kocher (Libertarian) 0.6% |
| South Dakota | Tim Johnson | Democratic | Re-elected, 49.6% | John Thune (Republican) 49.5% Kurt Evans (Libertarian) 0.9% |
| Tennessee | Fred Thompson | Republican | Retired: Republican victory | Lamar Alexander (Republican) 54% Bob Clement (Democrat) 44% |
| Texas | Phil Gramm | Republican | Retired: Republican victory | John Cornyn (Republican) 55.3% Ron Kirk (Democrat) 43.3% Scott Jameson (Libertarian) 0.8% Roy H. Williams (Green) 0.6% |
| Virginia | John Warner | Republican | Re-elected, 82.6% | Nancy Spannaus (Independent) 9.7% Jacob G. Hornberger (libertarian) 7.1% |
| West Virginia | Jay Rockefeller | Democratic | Re-elected, 63.1% | Jay Wolfe (Republican) 36.9% |
| Wyoming | Mike Enzi | Republican | Re-elected, 73% | Joyce Jansa Corcoran (Democrat) 27% |