| Des Moines Audubon SocietyClive | Form 990-N | No figure |
| Iowa Mormon Trails Association IncCorydon | Form 990-N | No figure |
| Forest ForeverProle | Form 990-N | No figure |
| Iowa Renewable Energy AssociationHiawatha | Form 990-N | No figure |
| Council Bluffs Trees ForeverCouncil Bluffs | Form 990-N | No figure |
| Iowa Prairie Network IncIowa City | Form 990-N | No figure |
| Wapsipinicon Snow Mobile Association IncIndependence | Form 990-N | No figure |
| Clinton Trees ForeverClinton | Form 990-N | No figure |
| Cedar Valley Trails PartnershipCedar Falls | Form 990-N | No figure |
| Muscatine Arboretum AssociationMuscatine | Form 990-N | No figure |
| Chariton River Greenbelt FoundationChariton | Form 990-N | No figure |
| Friends of Chickasaw County ConservationIonia | Form 990-N | No figure |
| Muscatine County Conservation FoundationMuscatine | Form 990-N | No figure |
| Buchanan County Four Seasons Trails AssociationIndependence | Form 990-N | No figure |
| Backbone Lake Friends IncElkader | Form 990-N | No figure |
| Wayne County Conservation Boosters IncCorydon | Form 990-N | No figure |
| Twin Lakes Restoration FoundationFort Dodge | Form 990-N | No figure |
| Friends of Union Slough National Wildlife Refuge IncTitonka | Form 990-N | No figure |
| Southfork Watershed Alliance IncIowa Falls | Form 990-N | No figure |
| Turkey River SportsmenMcGregor | Form 990-N | No figure |
| Iowa Wetland Mitigation Bank IncWest Des Moines | Form 990-N | No figure |
| Fort Dodge Area Gardeners IncFort Dodge | Form 990-N | No figure |
| Keep Scott County BeautifulDavenport | Form 990-N | No figure |
| Project Green IncIowa City | Form 990-N | No figure |
| Wayne County Conservation FoundationAllerton | Form 990-N | No figure |
| The Federated Garden Clubs of Iowa IncKensett | Form 990-N | No figure |
| Des Moines County Nature Trails Association IncBurlington | Form 990-N | No figure |
| Iowa Young BirdersAmes | Form 990-N | No figure |
| Friends of the Red Oak Trail IncRed Oak | Form 990-N | No figure |
| Partners of the ParksGranger | Form 990-N | No figure |
| Muscatine County Energy DistrictMuscatine | Form 990-N | No figure |
| Friends of Mahaska County Conversation IncRose Hill | Form 990-N | No figure |
| Lake Panorama Fin & Feather AssociationPanora | Form 990-N | No figure |
| Iowa Weed Commission AssociationCentral City | Form 990-N | No figure |
| Tree Des Moines IncDes Moines | Form 990-N | No figure |
| Iowa Urban Tree CouncilPleasant Hill | Form 990-N | No figure |
| Outdoor Alliance of Story CountyAmes | Form 990-N | No figure |
| Climate MarchDes Moines | Form 990-N | No figure |
| Sustainable IndependenceBrandon | Form 990-N | No figure |
| Centerville Garden ClubCenterville | Form 990-N | No figure |
| Energy 2 0 Society IncMount Vernon | Form 990-N | No figure |
| 100GRANNIES for a Livable FutureIowa City | Form 990-N | No figure |
| Polk City Arbor League IncPolk City | Form 990-N | No figure |
| Friends of Emma McCarthy Lee ParkAmes | Form 990-N | No figure |
| Oskaloosa Trees ForeverOskaloosa | Form 990-N | No figure |
| Slpia IncLake Park | Form 990-N | No figure |
| Partners for the Future - Dickinson County Land Air and WaterOkoboji | Form 990-N | No figure |
| Friends of Johnson County ConservationOxford | Form 990-N | No figure |
| Tri-State Public Range AssociationSioux City | Form 990-N | No figure |
| Friends of the Root River IncDecorah | Form 990-N | No figure |