| Climate Jobs Illinois Education FundSpringfield | Form 990 | $975,299FY2024 |
| Urban Rivers IncChicago | Form 990 | $942,073FY2024 |
| ScarceWheaton | Form 990 | $877,836FY2024 |
| Seven Generations AheadOak Park | Form 990 | $863,051FY2024 |
| Quad City Botanical Center FoundationRock Island | Form 990 | $859,903FY2025 |
| Ecology Action CenterNormal | Form 990 | $846,546FY2025 |
| Friends of Illinois Nature PreservesDeKalb | Form 990 | $831,423FY2025 |
| Klehm Arboretum and Botanic Garden IncRockford | Form 990 | $750,971FY2025 |
| Prairie Hills Resource Conservation and Development IncMacomb | Form 990 | $709,327FY2025 |
| Central States Water Pollution Control Association IncCrystal Lake | Form 990 | $694,479FY2025 |
| Neighbors for Environmental Justice IncChicago | Form 990 | $693,872FY2024 |
| Tree Fund-Tree Research & Education Endowment FundNaperville | Form 990 | $686,919FY2024 |
| Big Medicine NFPChicago | Form 990 | $677,452FY2024 |
| Saving Tomorrows Agriculture ResourcesChampaign | Form 990 | $647,711FY2025 |
| Shawnee Resource Conservation and Development Area IncGolconda | Form 990 | $615,078FY2025 |
| Five Hands Foundation IncCountry Club Hills | Form 990 | $610,234FY2025 |
| Friends of the Shawnee National ForestCarbondale | Form 990 | $609,391FY2024 |
| Evolve FoundationChicago | Form 990 | $593,945FY2025 |
| Great Rivers Land Preservation Association IncAlton | Form 990 | $538,618FY2024 |
| Forest Preserve Foundation IncChicago | Form 990 | $520,535FY2024 |
| Degrowth InstituteChicago | Form 990 | $518,865FY2024 |
| Friends of Central Algoma Land TrustLake Forest | Form 990 | $510,762FY2025 |
| Expeditions in Education IncChicago | Form 990 | $481,314FY2025 |
| Earth Rangers USA FoundationChicago | Form 990 | $456,652FY2025 |
| Lake Katherine Nature Center and Botanic GardensPalos Heights | Form 990 | $423,632FY2024 |
| Chicago Gateway Green CommitteeChicago | Form 990 | $418,444FY2025 |
| Keep Northern Illinois Beautiful IncRockford | Form 990 | $412,077FY2025 |
| Friends of the Forest Preserve District of Dupage CountyWheaton | Form 990 | $401,649FY2025 |
| Idea Store Creative Reuse CenterUrbana | Form 990 | $392,735FY2025 |
| Water Quality Research FoundationLisle | Form 990 | $369,501FY2025 |
| Lake Forest Garden ClubLake Forest | Form 990 | $365,951FY2025 |
| McHenry County Conservation FoundationRingwood | Form 990 | $363,000FY2025 |
| Illinois Grazing Lands CoalitionBreese | Form 990 | $351,021FY2025 |
| Our World Underwater Scholarship SocietyWoodridge | Form 990 | $328,808FY2025 |
| Cofan Survival Fund IncOak Park | Form 990 | $319,861FY2025 |
| Champaign County Environmental StewardsChampaign | Form 990 | $313,037FY2024 |
| One Earth CollectiveChicago | Form 990 | $298,523FY2025 |
| Friends of the Highwood Public LibraryHighwood | Form 990 | $296,740FY2025 |
| Illinois Water Environment AssociationChicago | Form 990 | $294,733FY2025 |
| Ballard Family Nature Center IncAltamont | Form 990 | $294,254FY2025 |
| Stillman Nature CenterSouth Barrington | Form 990 | $278,584FY2025 |
| Land Conservation FoundationUrbana | Form 990 | $262,318FY2024 |
| Lower Dupage River Watershed CoalitionNaperville | Form 990 | $261,628FY2026 |
| Wood St CollectiveChicago | Form 990 | $249,429FY2026 |
| Fox River Study GroupOswego | Form 990 | $244,230FY2025 |
| Green Earth IncCarbondale | Form 990 | $238,093FY2026 |
| Chicago Audubon SocietyChicago | Form 990 | $233,698FY2024 |
| Pilsen Environmental Rights and Reform OrganizationChicago | Form 990 | $233,212FY2025 |
| Climate Action EvanstonEvanston | Form 990 | $232,782FY2025 |
| Flint Creek Wildlife RehabilitationBarrington | Form 990 | $228,588FY2024 |