| SIOUX FALLS SWIM TEAM, INC. | — | NS006225 | 1977-04-26 | Active | SIOUX FALLS |
| SIOUX FALLS WASHINGTON HIGH SCHOOL MARCHING BAND BOOSTERS | — | NS010382 | 1995-08-03 | Active | SIOUX FALLS |
| SIOUX VALLEY MODEL ENGINEERS SOCIETY, INC. | — | NS006067 | 1976-08-27 | Active | SIOUX FALLS |
| SIOUX VALLEY OPTIMIST CLUB, INC. | — | NS014854 | 2012-06-04 | Active | Sioux Falls |
| SISSETON CEMETERY ASSOCIATION | — | NS014437 | 2010-10-20 | Active | SISSETON |
| SISSETON ECONOMIC DEVELOPMENT CORPORATION | — | NS008249 | 1986-02-27 | Active | SISSETON |
| SISSETON SWIMMING POOL ASSOCIATION, INC. | — | NS007448 | 1982-09-28 | Active | SISSETON |
| SNAKE CREEK DEVELOPMENT CORPORATION, INC. | — | NS013276 | 2006-11-13 | Active | FAULKTON |
| SOUTH DAKOTA ALPHA CHAPTER COMMUNITY/ALUMNI CORPORATION OF SIGMA PHI EPSILON | — | NS010970 | 1998-02-05 | Active | Brookings |
| SOUTH DAKOTA ASSOCIATION OF COLLEGES FOR TEACHER EDUCATION, INCORPORATED | — | NS005875 | 1975-10-08 | Dissolved | Sioux Falls |
| SOUTH DAKOTA ASSOCIATION OF ENVIRONMENTAL PROFESSIONALS | — | NS009614 | 1992-04-29 | Active | SIOUX FALLS |
| SOUTH DAKOTA ASSOCIATION OF FARM SERVICE AGENCY (FSA) STATE AND COUNTY EMPLOYEES | — | NS000323 | 1960-09-16 | Active | DeSmet |
| SOUTH DAKOTA ASSOCIATION OF SCHOOL BUSINESS OFFICIALS | — | NS005303 | 1973-05-01 | Active | DE SMET |
| SOUTH DAKOTA ASSOCIATION OF STUDENT FINANCIAL AID ADMINISTRATORS (SDASFAA) | — | NS010585 | 1996-05-30 | Active | Brookings |
| SOUTH DAKOTA CHAPTER OF AMERICAN PHYSICAL THERAPY ASSOCIATION | — | NS010950 | 1998-01-12 | Active | SIOUX FALLS |
| SOUTH DAKOTA CHAPTER OF THE SOIL AND WATER CONSERVATION SOCIETY INCORPORATED | — | NS008757 | 1988-06-14 | Active | Fort Pierre |
| SOUTH DAKOTA CORRECTIONS ASSOCIATION | — | NS013899 | 2008-12-12 | Dissolved | Sioux Falls |
| SOUTH DAKOTA COURT REPORTERS ASSOCIATION, INC. | — | NS014654 | 2011-07-29 | Active | Sioux Falls |
| SOUTH DAKOTA DENTAL HYGIENISTS' ASSOCIATION, INCORPORATED | — | NS004948 | 1971-06-18 | Active | Vermillion |
| SOUTH DAKOTA EMERGENCY MANAGEMENT ASSOCIATION | — | NS006812 | 1979-10-24 | Active | Yankton |
| SOUTH DAKOTA EMERGENCY NURSES ASSOCIATION (SD ENA) | — | NS011872 | 2001-10-29 | Active | Hot Springs |
| SOUTH DAKOTA FAMILY FORESTS ASSOCIATION | — | NS005484 | 1974-01-17 | Active | Black Hawk |
| SOUTH DAKOTA FARMHOUSE ASSOCIATION | — | NS000854 | 1965-08-03 | Active | Brookings |
| SOUTH DAKOTA FEDERATION OF MUSIC CLUBS | — | NS005733 | 1975-03-03 | Active | Spearfish |
| SOUTH DAKOTA GENEALOGICAL SOCIETY | — | NS007578 | 1983-05-10 | Active | MOBRIDGE |
| SOUTH DAKOTA INDIAN COUNTRY BAR ASSOCIATION | — | NS014946 | 2012-09-27 | Dissolved | Winner |
| SOUTH DAKOTA LIBRARY ASSOCIATION | — | NS155151 | 2018-10-15 | Active | Sioux Falls |
| SOUTH DAKOTA PARALEGAL ASSOCIATION, INC. | — | NS008956 | 1989-05-04 | Active | Aberdeen |
| SOUTH DAKOTA PARKINSON FOUNDATION | — | NS010629 | 1996-08-12 | Active | SIOUX FALLS |
| SOUTH DAKOTA PLANNERS ASSOCIATION | — | NS012194 | 2002-12-27 | Active | Sioux Falls |
| SOUTH DAKOTA PRESBYTERIAN WOMEN | — | NS314171 | 2025-11-20 | Active | SIOUX FALLS |
| SOUTH DAKOTA SCHOOL COUNSELOR ASSOCIATION | — | NS010380 | 1995-08-02 | Active | SIOUX FALLS |
| SOUTH DAKOTA SCHOOL NURSE ASSOCIATION | — | NS009763 | 1992-12-10 | Active | Rapid City |
| SOUTH DAKOTA SCIENCE TEACHERS ASSOCIATION | — | NS009661 | 1992-07-13 | Active | Mina |
| SOUTH DAKOTA SHEEP GROWERS ASSOCIATION | — | NS006842 | 1979-12-12 | Active | Bison |
| SOUTH DAKOTA SHOOTING SPORTS ASSOCIATION | — | NS011882 | 2001-11-13 | Active | Pierre |
| SOUTH DAKOTA SNOW QUEEN FESTIVAL, INC. | — | NS012102 | 2002-09-11 | Active | ABERDEEN |
| SOUTH DAKOTA SOCIETY OF ORTHODONTISTS | — | NS011021 | 1998-04-27 | Active | Sioux Falls |
| SOUTH DAKOTA SOCIETY OF RADIOLOGIC TECHNOLOGISTS | — | NS011181 | 1999-01-22 | Active | Sioux Falls |
| SOUTH DAKOTA SOYBEAN ASSOCIATION | — | NS007455 | 1982-10-08 | Active | Sioux Falls |
| SOUTH DAKOTA SPECIALTY PRODUCERS ASSOCIATION | — | NS012219 | 2003-01-23 | Active | Pierre |
| SOUTH DAKOTA STATE ASSEMBLY OF ASSOCIATION OF SURGICAL TECHNOLOGISTS, INC. | — | NS011825 | 2001-08-13 | Active | Rapid City |
| SOUTH DAKOTA SWIMMING, INC. | — | NS007259 | 1981-09-30 | Active | Aberdeen |
| SOUTH DAKOTA WORLD AFFAIRS COUNCIL | — | NS014249 | 2010-02-26 | Active | BROOKINGS |
| SOUTH SHORE AREA VOLUNTEER FIRE DEPARTMENT | — | NS014049 | 2009-06-10 | Active | SOUTH SHORE |
| SOUTHEASTERN DISTRICT DENTAL SOCIETY | — | NS010771 | 1997-05-08 | Active | Sioux Falls |
| SOUTHERN PINES HOMEOWNERS ASSOCIATION | — | NS011982 | 2002-04-01 | Active | SIOUX FALLS |
| SPEARFISH CHAMBER OF COMMERCE | — | NS001182 | 1967-06-20 | Active | SPEARFISH |
| SPEARFISH COMMUNITY PANTRY, INC. | — | NS012560 | 2004-05-06 | Active | SPEARFISH |
| SPEARFISH EVANS-TONN DITCH COMPANY | — | NS013319 | 2007-01-12 | Active | Spearfish |