| South Dakota High School Activities AssociationPierre | Form 990 | $3,766,006FY2025 |
| Red Cloud RenewablePine Ridge | Form 990 | $2,115,724FY2025 |
| South Dakota Association of Conservations Districts IncPierre | Form 990 | $1,736,638FY2025 |
| Belle Fourche River Watershed PartnershipBelle Fourche | Form 990 | $1,553,725FY2025 |
| Buffalo Nations Grasslands AllianceLower Brule | Form 990 | $1,338,397FY2025 |
| South Dakota Soil Health CoalitionPierre | Form 990 | $1,178,084FY2025 |
| Tri County Landfill Association IncPukwana | Form 990 | $1,140,590FY2024 |
| Big Sioux Nursery IncWatertown | Form 990 | $863,656FY2025 |
| The Second Century Habitat Fund IncPierre | Form 990 | $619,463FY2024 |
| Northern Prairies Land TrustSioux Falls | Form 990 | $595,730FY2025 |
| Great Plains Tribal Water AllianceincPine Ridge | Form 990 | $572,513FY2024 |
| Northwest South Dakota Regional Landfill Association IncLemmon | Form 990 | $434,373FY2024 |
| South Dakota Agricultural Land TrustPierre | Form 990 | $266,593FY2025 |
| Clean Water LegacyRapid City | Form 990 | $248,102FY2025 |
| Friends of the Big Sioux RiverSioux Falls | Form 990-EZ | $186,258FY2025 |
| Farwide Conservation IncHecla | Form 990-EZ | $157,751FY2025 |
| Badlands National Park ConservancyRapid City | Form 990 | $149,803FY2024 |
| Pickerel Lake ConservancySioux Falls | Form 990-EZ | $140,844FY2024 |
| McCook Lake Recreation Area AssociationMcCook Lake | Form 990-EZ | $129,987FY2026 |
| Vore Buffalo Jump FoundationBelle Fourche | Form 990-EZ | $104,035FY2024 |
| Habitat OneSpearfish | Form 990-EZ | $76,135FY2025 |
| McCook Lake Izaak Walton LeagueNorth Sioux City | Form 990 | $46,464FY2025 |
| Rural Water Center IncMadison | Form 990-N | No figure |
| Black Hills Cave and Nature ConservancyRapid City | Form 990-N | No figure |
| Missouri Sedimentation Acton Coalition IncSpringfield | Form 990-N | No figure |
| 29-90 Sportsmans ClubSioux Falls | Form 990-N | No figure |
| Enemy Swim Preservation AssociationWebster | Form 990-N | No figure |
| Norbeck SocietyRapid City | Form 990-N | No figure |
| Mothers Healing GardenDell Rapids | Form 990-N | No figure |
| South Dakota Family Forests AssociationRapid City | Form 990-N | No figure |
| Little Spearfish Conservation & Historic Preservation AssocRapid City | Form 990-N | No figure |
| Defenders of the Black Hills IncRapid City | Form 990-N | No figure |
| Central Rockies Sustainable Forestry Education ProgramRapid City | Form 990-N | No figure |
| Lakota Women InitiativeParmelee | Form 990-N | No figure |
| Pennington County Master Gardeners IncRapid City | Form 990-N | No figure |
| Randall Resource Conservation and Development Association IncorporatPickstown | Form 990-N | No figure |
| Mansfield Community Betterment AssociationMansfield | Form 990-N | No figure |
| Rapid Creek Preservation Association IncRapid City | Form 990-N | No figure |
| Prairie Hills Audubon Society of Western South Dakota IncBlack Hawk | Form 990-N | No figure |
| Lead City BeautificationLead | Form 990-N | No figure |
| Solutions for Resilient Communities IncSpearfish | Form 990-N | No figure |
| Izaak Walton League of Amercia IncMadison | Form 990-N | No figure |
| North Central Resource Conservation and Developement Association IncPierre | Form 990-N | No figure |
| Lake Campbell Improvement AssosciationBrookings | Form 990-N | No figure |
| Rapid City Garden ClubRapid City | Form 990-N | No figure |
| Black Hills FlyfishersRapid City | Form 990-N | No figure |
| Charles Mix County Lake Restoration OrganizationLake Andes | Form 990-N | No figure |
| South Central Resource Conservation and DevelopmentMurdo | Form 990-N | No figure |
| South Dakota Lakes & StreamsSioux Falls | Form 990-N | No figure |
| Badlands Resource Conservation and Development Area Council IncCody Lake Twp | Form 990-N | No figure |