The figures on this page were reported to the State Board of Elections by each of the 24 county Boards of Elections of the State of Maryland. County Boards of Elections communicate their results to the State Board once all of their precinct data has been collected. The State Board of Elections posts those results immediately upon receipt. Last updated at 12:17 PM on Tuesday, April 06, 2004 (US Eastern Time).
| George W. Bush (Won) | |
| Harford | 8,351 |
| Carol Moseley Braun | Wesley K. Clark | Howard Dean | John Edwards | |
| Harford | 76 | 153 | 480 | 5,253 |
| Dick Gephardt | Mildred Glover | John F. Kerry (Won) | Dennis J. Kucinich | |
| Harford | 82 | 178 | 7,978 | 167 |
| Lyndon H. LaRouche, Jr. | Joseph Lieberman | Alfred Sharpton, Jr. | Uncommitted To Any Presidential Candidate | |
| Harford | 60 | 179 | 408 | 409 |
| George W. Bush (Won) | |
| Harford | 5,016 |
| Carol Moseley Braun | Wesley K. Clark | Howard Dean | John Edwards | |
| Harford | 24 | 90 | 234 | 2,877 |
| Dick Gephardt | Mildred Glover | John F. Kerry (Won) | Dennis J. Kucinich | |
| Harford | 38 | 77 | 4,069 | 88 |
| Lyndon H. LaRouche, Jr. | Joseph Lieberman | Alfred Sharpton, Jr. | Uncommitted To Any Presidential Candidate | |
| Harford | 32 | 94 | 143 | 185 |
| George W. Bush (Won) | |
| Harford | 1,822 |
| Carol Moseley Braun | Wesley K. Clark | Howard Dean | John Edwards | |
| Harford | 38 | 43 | 167 | 1,480 |
| Dick Gephardt | Mildred Glover | John F. Kerry (Won) | Dennis J. Kucinich | |
| Harford | 25 | 64 | 2,815 | 45 |
| Lyndon H. LaRouche, Jr. | Joseph Lieberman | Alfred Sharpton, Jr. | Uncommitted To Any Presidential Candidate | |
| Harford | 15 | 47 | 216 | 117 |
| George W. Bush (Won) | |
| Harford | 1,247 |
| Carol Moseley Braun | Wesley K. Clark | Howard Dean | John Edwards | |
| Harford | 11 | 16 | 62 | 755 |
| Dick Gephardt | Mildred Glover | John F. Kerry (Won) | Dennis J. Kucinich | |
| Harford | 15 | 31 | 868 | 28 |
| Lyndon H. LaRouche, Jr. | Joseph Lieberman | Alfred Sharpton, Jr. | Uncommitted To Any Presidential Candidate | |
| Harford | 13 | 34 | 39 | 84 |
| Ray Bly | Earl S. Gordon | Dorothy Corry Jennings | James A. Kodak | |
| Harford | 263 | 443 | 668 | 245 |
| Eileen "Cookie Baker" Martin | E. J. Pipkin (Won) | John Stafford | Corrogan R. Vaughn | |
| Harford | 544 | 4,083 | 838 | 281 |
| Gene Zarwell | |
| Harford | 345 |
| Sid Altman | A. Robert Kaufman | Barbara A. Mikulski (Won) | |
| Harford | 482 | 1,650 | 12,782 |
| Richard F. Colburn | Wayne T. Gilchrest (Won) | |
| Harford | 2,444 | 3,029 |
| Kostas Alexakis | Steven R. Eastaugh | Harry E. Sampson | Ann D. Tamlyn (Won) | |
| Harford | 1,509 | 745 | 1,080 | 2,831 |
| Jane Brooks (Won) | Dave Harvilicz | Michael J. Littleton | |
| Harford | 921 | 499 | 398 |
| C. A. Dutch Ruppersberger (Won) | |
| Harford | 4,251 |
| Roscoe G. Bartlett (Won) | Scott L. Rolle | |
| Harford | 1,057 | 239 |
| James Daniel Benson | Kenneth T. Bosley (Won) | Rodney D. Fox | Richard Nacewicz | |
| Harford | 232 | 642 | 178 | 76 |
| Robert J. Rhudy | Kevin M. Shaffer | Ty Unglebower | |
| Harford | 40 | 220 | 81 |
| Donna F. Cantor John F. Kerry (Won) | Connie DeJuliis Dick Gephardt | Cheryl Ann Everman John Edwards (Won) | Erin M. Fitzsimmons Howard Dean | |
| Harford | 4,248 | 1,003 | 3,591 | 1,063 |
| Patricia Ann Foerster Dick Gephardt | Karen E. Greene Wesley K. Clark | Hope R. Harrington Wesley K. Clark | Jacqueline L. Harris Howard Dean | |
| Harford | 1,018 | 896 | 645 | 1,131 |
| Mary Carol "Sam" Miller Dick Gephardt | M. Catherine Poe Howard Dean | Ann Marie Remillard | Treva Ross Lyndon H. LaRouche Jr. | |
| Harford | 615 | 742 | 1,802 | 215 |
| Frances M. Ruark Lyndon H. LaRouche Jr. | Edith L. Segree Dick Gephardt | Donna Smith Turner Wesley K. Clark | |
| Harford | 250 | 376 | 463 |
| Corynne B. Courpas Howard Dean | Susan Lucas Derse Wesley K. Clark | Jennifer Dougherty Howard Dean | Gail L. Evans Dick Gephardt | |
| Harford | 241 | 193 | 370 | 236 |
| Maggi Hays Wesley K. Clark | Beverly Kipe Dennis J. Kucinich | Lisa M. Lum Dennis J. Kucinich | Rachel Querry Joseph Lieberman | |
| Harford | 179 | 62 | 53 | 145 |
| Anita L. Riley Dick Gephardt | Barbara Rodekohr Lyndon H. LaRouche Jr. | Betty Roth | Joanne M. Rubin Joseph Lieberman | |
| Harford | 248 | 41 | 567 | 124 |
| Judy Lyons Wolf | Laura J. Wright Lyndon H. LaRouche Jr. | |
| Harford | 542 | 71 |
| Josephine Williams Barnes Howard Dean | Connie D. Betts Lyndon H. LaRouche Jr. | Cheryl Bost Howard Dean | Thomasine Ayana Derricks Dick Gephardt | |
| Harford | 753 | 218 | 650 | 361 |
| Marietta A. English | Lorretta Johnson Dick Gephardt | Flo Jones Howard Dean | Delores G. Kelley Wesley K. Clark | |
| Harford | 1,277 | 527 | 600 | 497 |
| Elizabeth L. Lilley Wesley K. Clark | Penny McCrimmon | Mabel Lake Murray John F. Kerry (Won) | Jackie Nickel Wesley K. Clark | |
| Harford | 354 | 1,012 | 2,681 | 386 |
| Erin Willette Smith Lyndon H. LaRouche Jr. | Y. Maria Welch John F. Kerry (Won) | Gayle Westcott Dick Gephardt | |
| Harford | 180 | 2,117 | 274 |
| Joseph R. Armstead Alfred Sharpton Jr. | Jesse Ballenger Dennis J. Kucinich | Oz Bengur Joseph Lieberman | "A. J." Bierman | |
| Harford | 487 | 150 | 166 | 456 |
| Alexander O. Boulton John F. Kerry (Won) | Thomas M. Burnham Dick Gephardt | Clifford J. Collins, III John F. Kerry (Won) | Robert Douglas Dennis J. Kucinich | |
| Harford | 2,102 | 215 | 2,152 | 162 |
| Dion F. Guthrie Howard Dean | Henry R. Hergenroeder, Jr. Wesley K. Clark | Jay Hidden John Edwards (Won) | Don Mason | |
| Harford | 525 | 180 | 1,121 | 489 |
| Tyrone D. McCormick Howard Dean | John A. Micklos | John "Johnny O" Olszewski, Sr. Howard Dean | C.A. Cory Ruppersberger Dick Gephardt | |
| Harford | 347 | 442 | 327 | 474 |
| Dirk Selland John Edwards | Ted Vernon Smith, Jr. Lyndon H. LaRouche Jr. | William V. Taylor John F. Kerry | Michael H. Weir, Jr. Wesley K. Clark | |
| Harford | 892 | 80 | 2,005 | 190 |
| Jayson T. Williams Wesley K. Clark | |
| Harford | 154 |
| Robert Blumenthal John Edwards (Won) | Dale R. Chase Howard Dean | Michael G. Comeau | Michael G. Day Wesley K. Clark | |
| Harford | 635 | 230 | 557 | 172 |
| Bill DuVall Dick Gephardt | Rodney D. Fox | Damian L. Halstad Wesley K. Clark | David G. Nance Lyndon H. LaRouche Jr. | |
| Harford | 169 | 292 | 81 | 56 |
| Sushant Sidh John Edwards | William Stevens | George D. Wenschhof Howard Dean | Ronald W. Wolf Dick Gephardt | |
| Harford | 473 | 294 | 148 | 187 |
| Joseph M. Alden John F. Kerry (Won) | Edmund T. Bennett John F. Kerry (Won) | Eric M. Bromwell Wesley K. Clark | Jon S. Cardin Dick Gephardt | |
| Harford | 3,533 | 3,353 | 568 | 573 |
| Charles T. Dean, III John Edwards (Won) | Michael A. Eaves John F. Kerry | Grason Eckel | Ryan Ewing Howard Dean | |
| Harford | 2,698 | 2,920 | 709 | 587 |
| George A. Gorayeb Howard Dean | J. Christopher Llinas John Edwards | Gene M. Ransom, III Wesley K. Clark | Daniel Rozmiarek Howard Dean | |
| Harford | 380 | 2,109 | 282 | 466 |
| Jack R. Sturgill, Jr. | Ted Venetoulis Dick Gephardt | George W. Wilson, Jr. Wesley K. Clark | |
| Harford | 1,154 | 815 | 343 |
| Richard F. Colburn | Ann Horner Granados George W. Bush (Won) | Nora Keenan | Tony McConkey | |
| Harford | 1,942 | 3,182 | 594 | 500 |
| Lee Merrell | J. Lowell Stoltzfus George W. Bush (Won) | Cathleen M. Vitale George W. Bush (Won) | |
| Harford | 678 | 3,617 | 3,799 |
| Paul Michael Blitz | Luis E. Borunda George W. Bush (Won) | David R. Craig George W. Bush (Won) | Walter R. Hayes, Jr. George W. Bush (Won) | |
| Harford | 406 | 1,166 | 1,679 | 1,417 |
| Tim Brooks | Samie Conyers | George C. Edwards George W. Bush (Won) | James M. Harkins George W. Bush (Won) | |
| Harford | 206 | 127 | 1,004 | 1,142 |
| Koreen Hughes George W. Bush (Won) | |
| Harford | 924 |
| Andy Harris George W. Bush (Won) | Donna D. Judge George W. Bush (Won) | Jean L. Rothert George W. Bush (Won) | |
| Harford | 4,227 | 3,982 | 3,803 |
| John C. Fiastro, Jr. George W. Bush (Won) | Melissa Redmer Mullahey George W. Bush (Won) | Emil B. Pielke George W. Bush (Won) | |
| Harford | 1,410 | 1,567 | 1,321 |
| Philip Greene | Richard Hugg George W. Bush (Won) | David G. Lenhart George W. Bush (Won) | Tricia Wolfe George W. Bush (Won) | |
| Harford | 203 | 931 | 998 | 982 |
| Maurice Whiteford Baldwin, Jr. (Won) | Steven J. Scheinin | |
| Harford | 5,822 | 2,240 |
| Maurice Whiteford Baldwin, Jr. (Won) | Steven J. Scheinin | |
| Harford | 10,261 | 3,029 |