| Old Northside Foundation IncIndianapolis | Form 990 | $66,355FY2025 |
| Big Lake Association IncColumbia City | Form 990-EZ | $64,364FY2025 |
| United Neighborhoods of Evansville IncEvansville | Form 990-EZ | $63,749FY2025 |
| Izaak Walton League of America IncHobart | Form 990-EZ | $56,339FY2022 |
| Warsaw Biblical GardensWarsaw | Form 990-EZ | $54,425FY2024 |
| Friends of the Panhandle Pathway IncWinamac | Form 990 | $52,472FY2025 |
| Lost River Foundation IncWest Baden Springs | Form 990-EZ | $51,833FY2024 |
| Silver Lake - Kosciusko Co - Conservation FoundationAvon | Form 990-N | No figure |
| C O Mollenhour Conservation Camp Council IncWarsaw | Form 990-N | No figure |
| Center Lake Conservation Association IncWarsaw | Form 990-N | No figure |
| Union Mills Conservation ClubUnion Mills | Form 990-EZ | $45,803FY2025 |
| Laporte Area Lake Association IncLa Porte | Form 990-EZ | $45,137FY2017 |
| Veterans Memorial Park IncCrawfordsville | Form 990-N | No figure |
| Friends of McCormicks Creek State Park IncSpencer | Form 990-N | No figure |
| Indiana Recycling Coalition IncIndianapolis | Form 990-N | No figure |
| Wood-Land-Lakes Resource Conservation and Development IncMiddlebury | Form 990-N | No figure |
| Jay County Conservation ClubPortland | Form 990-EZ | $15,778FY2025 |
| Pennsy Trails of Hancock County IncNew Palestine | Form 990-N | No figure |
| Alliance of Indiana Rural Waterfoundation IncFranklin | Form 990-N | No figure |
| Friends of the Ohio River Greenway IncorporatedJeffersonville | Form 990-N | No figure |
| FCVCC Education and Training IncMarkleville | Form 990-N | No figure |
| Snider Alumni Football NetworkFort Wayne | Form 990-N | No figure |
| Friends of the Parks of Allen County Indiana IncFort Wayne | Form 990-N | No figure |
| Arrow Head Country Resource Conservation and Development AreaWinamac | Form 990-N | No figure |
| Big Turkey Lake Conservancy IncorporatedLagrange | Form 990-N | No figure |
| Friends of RichlandRichland | Form 990-N | No figure |
| Land Stewards of IndianapolisIndianapolis | Form 990-N | No figure |
| Indiana Smallmouth Alliance IncorporatedIndianapolis | Form 990-N | No figure |
| Wabash Saddle Club IncLagro | Form 990-N | No figure |
| Darlington Conservation Club IncDarlington | Form 990-N | No figure |
| St Joseph River Valley Fly Fishers Club IncSouth Bend | Form 990-N | No figure |
| Blackford Greenway IncHartford City | Form 990-N | No figure |
| Sunnyside Master Gardener Association of Southern IndianaNew Albany | Form 990-N | No figure |
| Hamilton County Urban Conservation Association IncFortville | Form 990-N | No figure |
| Energy Matters Community CoalitionincorporatedColumbus | Form 990-N | No figure |
| Steuben County Lakes Council Land Trust IncAngola | Form 990-N | No figure |
| Garden Club of Indiana IncWinamac | Form 990-N | No figure |
| West Otter Lake Property Owners Association IncAngola | Form 990-N | No figure |
| Indiana Sassafras Audubon SocietyBloomington | Form 990-N | No figure |
| Porter County Master Gardeners AssociationValparaiso | Form 990-N | No figure |
| Keep Noblesville Beautiful IncNoblesville | Form 990-N | No figure |
| Friends Group of Hardy Lake IncScottsburg | Form 990-N | No figure |
| Brown County Native Woodlands Project IncNashville | Form 990-N | No figure |
| Bullfork Wildlife PreserveOldenburg | Form 990-N | No figure |
| Remington-Wolcott Community Development IncRemington | Form 990-N | No figure |
| Hudson Lake Conservation Association IncNew Carlisle | Form 990-N | No figure |
| Huntington County Master Gardeners IncHuntington | Form 990-N | No figure |
| Carmel Green Initiative IncCarmel | Form 990-N | No figure |
| Webster Foundation IncNorth Webster | Form 990-N | No figure |
| Friends of the Upper Wabash Interpretive Services IncAndrews | Form 990-N | No figure |