| Upper Iowa River AllianceDecorah | Form 990-N | No figure |
| Society of American ForestersLetts | Form 990-N | No figure |
| Agua Es Vida - PR IncCouncil Bluffs | Form 990-N | No figure |
| Manna of Worth County IncNorthwood | Form 990-N | No figure |
| Partners of Scott County WatershedsDavenport | Form 990-N | No figure |
| Belmond Trees ForeverBelmond | Form 990-N | No figure |
| Lost Island Protective AssociationRuthven | Form 990-N | No figure |
| Herpmapper IncMuscatine | Form 990-N | No figure |
| Environmental Law CollaborativeIowa City | Form 990-N | No figure |
| Friends of Jones County Conservation and Nature CenterCenter Junction | Form 990-N | No figure |
| Friends of the Marquette Driftless AreaMarquette | Form 990-N | No figure |
| Bremer County Nature AllianceTripoli | Form 990-N | No figure |
| Clayton County Energy DistrictElkader | Form 990-N | No figure |
| Howard County Energy DistrictCresco | Form 990-N | No figure |
| Iowas Coldwater Conservancy IncMuscatine | Form 990-N | No figure |
| Friends of Yellow Smoke IncDenison | Form 990-N | No figure |
| Montgomery County Conservation FoundationRed Oak | Form 990-N | No figure |
| Friends of the Marshall County Conservation IncorporatedMarshalltown | Form 990-N | No figure |
| Dubuque Trees ForeverDubuque | Form 990-N | No figure |
| Poweshiek County Whitetails ConservationMalcom | Form 990-N | No figure |
| Milkweed MattersPacific Junction | Form 990-N | No figure |
| ThriftologySioux City | Form 990-N | No figure |
| Friends of Waubonsie State ParkRandolph | Form 990-N | No figure |
| Hares Pond Recreational Park IncRowley | Form 990-N | No figure |
| Wapsi Bottom Sports ClubOxford Junction | Form 990-N | No figure |
| Through the LensCouncil Bluffs | Form 990-N | No figure |
| Friends of Palisades-Kepler State ParkMount Vernon | Form 990-N | No figure |
| Five Island Lake AssociationEmmetsburg | Form 990-N | No figure |
| Winneshiek Conservation FoundationFort Atkinson | Form 990-N | No figure |
| Melvin 313 ClubMelvin | Form 990-N | No figure |
| Delaware County Energy DistrictManchester | Form 990-N | No figure |
| Iowa Conservative Energy ForumWest Des Moines | Form 990-N | No figure |
| Johnson Clean Energy DistrictIowa City | Form 990-N | No figure |
| Friends of Blood RunLarchwood | Form 990-N | No figure |
| Jackson County Energy DistrictMaquoketa | Form 990-N | No figure |
| Friends of Brookside ParkAmes | Form 990-N | No figure |
| Friends of Fairmount Cemetery and Preservation GroupDavenport | Form 990-N | No figure |
| Allamakee Energy DistrictWaukon | Form 990-N | No figure |
| WINGS2WATERCedar Rapids | Form 990-N | No figure |
| Fort Madison Community Beautification Foundation IncFort Madison | Form 990-N | No figure |
| Cedar Rapids and Iowa City Walleye ClubCedar Rapids | Form 990-N | No figure |
| Raptology IncIowa City | Form 990-N | No figure |
| Keep Iowa Beautiful-Hometown PrideCamanche | Form 990-N | No figure |
| Linn Clean Energy DistrictCedar Rapids | Form 990-N | No figure |
| Crescent ForestHoney Creek | Form 990-N | No figure |
| Friends of Loess Hills State Forest and Preparation Canyon State ParkMondamin | Form 990-N | No figure |
| Regen GardensWaterloo | Form 990-N | No figure |
| For the Good Ole BirdsRedfield | Form 990-N | No figure |
| Dubuque County Energy DistrictDubuque | Form 990-N | No figure |
| Oh Happy Play LLCDubuque | Form 990-N | No figure |