| SOUTH DAKOTA VOTER REGISTRATION | MAY 21, 1990 | |||
| TOTAL | REPUBLICAN | DEMOCRATIC | OTHER | |
| AURORA | 2190 | 876 | 1219 | 95 |
| BEADLE | 11531 | 4529 | 6027 | 975 |
| BENNETT | 1820 | 791 | 947 | 82 |
| BON HOMME | 4793 | 2438 | 2165 | 190 |
| BROOKINGS | 13174 | 6721 | 4662 | 1791 |
| BROWN | 21292 | 8991 | 10733 | 1568 |
| BRULE | 3298 | 1186 | 1958 | 154 |
| BUFFALO | 961 | 189 | 742 | 30 |
| BUTTE | 4387 | 3142 | 1076 | 169 |
| CAMPBELL | 1584 | 1343 | 213 | 28 |
| CHARLES MIX | 5713 | 2002 | 3475 | 236 |
| CLARK | 2988 | 1660 | 1193 | 135 |
| CLAY | 6591 | 2776 | 3082 | 733 |
| CODINGTON | 12234 | 5287 | 5618 | 1329 |
| CORSON | 2326 | 960 | 1239 | 127 |
| CUSTER | 4064 | 2462 | 1177 | 425 |
| DAVISON | 10076 | 4409 | 4801 | 866 |
| DAY | 4678 | 1915 | 2558 | 205 |
| DEUEL | 3154 | 1440 | 1408 | 306 |
| DEWEY | 2899 | 992 | 1706 | 201 |
| DOUGLAS | 2582 | 1928 | 591 | 63 |
| EDMUNDS | 3114 | 1518 | 1435 | 161 |
| FALL RIVER | 4490 | 2515 | 1590 | 385 |
| FAULK | 1960 | 1013 | 878 | 69 |
| GRANT | 5129 | 2533 | 2159 | 437 |
| GREGORY | 3465 | 1643 | 1714 | 108 |
| HAAKON | 1599 | 1102 | 448 | 49 |
| HAMLIN | 3202 | 1868 | 1136 | 198 |
| HAND | 3154 | 1612 | 1324 | 218 |
| HANSON | 2022 | 775 | 939 | 308 |
| HARDING | 1123 | 779 | 293 | 51 |
| HUGHES | 9607 | 5846 | 2944 | 817 |
| HUTCHINSON | 5707 | 4155 | 1404 | 148 |
| HYDE | 1255 | 635 | 557 | 63 |
| JACKSON | 1565 | 938 | 570 | 57 |
| JERAULD | 1786 | 955 | 749 | 82 |
| JONES | 992 | 703 | 270 | 19 |
| KINGSBURY | 3969 | 2430 | 1341 | 198 |
| LAKE | 6710 | 2913 | 3426 | 371 |
| LAWRENCE | 11455 | 6637 | 3835 | 983 |
| LINCOLN | 8613 | 4476 | 3422 | 715 |
| LYMAN | 2151 | 1243 | 833 | 75 |
| MARSHALL | 3091 | 1313 | 1693 | 85 |
| MCCOOK | 3985 | 1984 | 1693 | 308 |
| MCPHERSON | 2448 | 1923 | 448 | 77 |
| MEADE | 10729 | 6130 | 3733 | 866 |
| MELLETTE | 1298 | 655 | 577 | 66 |
| MINER | 2184 | 776 | 1256 | 152 |
| MINNEHAHA | 72378 | 33660 | 33269 | 5449 |
| MOODY | 3834 | 1533 | 1953 | 348 |
| PENNINGTON | 42462 | 23712 | 14963 | 3787 |
| PERKINS | 2689 | 1563 | 994 | 132 |
| POTTER | 2312 | 1593 | 650 | 69 |
| ROBERTS | 5733 | 1973 | 3333 | 427 |
| SANBORN | 2134 | 1144 | 882 | 108 |
| SHANNON | 3352 | 597 | 2507 | 248 |
| SPINK | 5011 | 2112 | 2512 | 387 |
| STANLEY | 1673 | 856 | 689 | 128 |
| SULLY | 1267 | 718 | 515 | 34 |
| TODD | 3131 | 721 | 2165 | 245 |
| TRIPP | 4282 | 2341 | 1700 | 241 |
| TURNER | 5453 | 3437 | 1716 | 300 |
| UNION | 5878 | 2238 | 3117 | 523 |
| WALWORTH | 3785 | 2493 | 1100 | 192 |
| YANKTON | 10332 | 5152 | 4394 | 786 |
| ZIEBACH | 1096 | 492 | 507 | 97 |
| TOTALS | 405940 | 201442 | 174223 | 30275 |
| PERCENTAGE | 49.62% | 42.92% | 7.46% |