Official Returns 2004 Special Congressional Election
| United States Representative | |||
| Stephanie | Larry | ||
| Herseth - D | Diedrich - R | ||
| AURORA | 717 | 642 | |
| BEADLE | 3243 | 2829 | |
| BENNETT | 637 | 417 | |
| BON HOMME | 1383 | 1073 | |
| BROOKINGS | 4945 | 4323 | |
| BROWN | 8079 | 5822 | |
| BRULE | 992 | 855 | |
| BUFFALO | 437 | 105 | |
| BUTTE | 1036 | 1612 | |
| CAMPBELL | 216 | 448 | |
| CHARLES MIX | 1707 | 1712 | |
| CLARK | 902 | 906 | |
| CLAY | 2499 | 1324 | |
| CODINGTON | 4312 | 4251 | |
| CORSON | 569 | 445 | |
| CUSTER | 1205 | 1675 | |
| DAVISON | 2903 | 3017 | |
| DAY | 1750 | 1008 | |
| DEUEL | 1035 | 757 | |
| DEWEY | 1267 | 433 | |
| DOUGLAS | 442 | 1134 | |
| EDMUNDS | 856 | 984 | |
| FALL RIVER | 1166 | 1384 | |
| FAULK | 497 | 615 | |
| GRANT | 1556 | 1444 | |
| GREGORY | 899 | 1019 | |
| HAAKON | 307 | 608 | |
| HAMLIN | 1071 | 1290 | |
| HAND | 833 | 917 | |
| HANSON | 509 | 708 | |
| HARDING | 160 | 441 | |
| HUGHES | 3017 | 3665 | |
| HUTCHINSON | 1320 | 2085 | |
| HYDE | 307 | 380 | |
| JACKSON | 453 | 444 | |
| JERAULD | 545 | 442 | |
| JONES | 229 | 380 | |
| KINGSBURY | 1272 | 1089 | |
| LAKE | 2213 | 1868 | |
| LAWRENCE | 3103 | 4020 | |
| LINCOLN | 4948 | 5640 | |
| LYMAN | 806 | 644 | |
| MARSHALL | 1068 | 709 | |
| MCCOOK | 1277 | 1319 | |
| MCPHERSON | 455 | 854 | |
| MEADE | 2816 | 4072 | |
| MELLETTE | 415 | 307 | |
| MINER | 622 | 513 | |
| MINNEHAHA | 27458 | 23828 | |
| MOODY | 1388 | 1062 | |
| PENNINGTON | 11530 | 16330 | |
| PERKINS | 375 | 727 | |
| POTTER | 531 | 816 | |
| ROBERTS | 1912 | 1306 | |
| SANBORN | 596 | 438 | |
| SHANNON | 2001 | 138 | |
| SPINK | 1543 | 1357 | |
| STANLEY | 593 | 615 | |
| SULLY | 255 | 437 | |
| TODD | 1651 | 314 | |
| TRIPP | 1100 | 1400 | |
| TURNER | 1604 | 1759 | |
| UNION | 1761 | 1782 | |
| WALWORTH | 965 | 1305 | |
| YANKTON | 3697 | 2968 | |
| ZIEBACH | 464 | 204 | |
| TOTALS | 261835 | 132420 | 129415 |
| PERCENTAGE | 50.57% | 49.43% | |