2004 United States Senate election in Maryland

The 2004 United States Senate election in Maryland was held on November 2, 2004. Incumbent Democratic U.S. Senator Barbara Mikulski won re-election to a fourth term. This is the most recent time that a Democratic Senate candidate has won Allegeny County, Caroline County, St. Mary's County or Worcester County. This is the last time that the winning candidate carried a majority of Maryland's county-level jurisdictions in a United States Senate election in Maryland.

Candidates

 * Barbara Mikulski, incumbent U.S. Senator
 * Robert Kaufman, social organizer
 * Sid Altman, accountant

Candidates

 * Ray Bly, Vietnam War veteran
 * Earl S. Gordon, surveyor
 * Dorothy Curry Jennings, educator
 * James A. Kodak, research associate at the University of Maryland
 * Eileen Martin, educator
 * E. J. Pipkin, State Senator
 * John Stafford, government bureaucrat
 * Corrogan R. Vaughn, Baptist deacon
 * Gene Zarwell, perennial candidate

Candidates

 * Maria Allwine (G)
 * Barbara Mikulski (D), incumbent U.S. Senator
 * E. J. Pipkin (R), State Senator
 * Thomas Trump (C)

Counties that flipped from Democrat to Republican

 * Carroll (largest municipality: Eldersburg)
 * Cecil (largest municipality: Elkton)
 * Harford (largest municipality: Aberdeen)
 * Queen Anne's (largest municipality: Stevensville)
 * Washington (largest municipality: Hagerstown)