Organizations
Largest first
By revenue on the last return. Organizations that file Form 990-N report no figures and come last.
| Organization | Return | Revenue |
|---|---|---|
| Chicago Horticultural SocietyGlencoe | Form 990 | $68,147,549FY2024 |
| Elevate EnergyChicago | Form 990 | $60,915,201FY2024 |
| Morton ArboretumLisle | Form 990 | $57,793,716FY2024 |
| Environmental Law & Policy Center of the MidwestChicago | Form 990 | $12,058,051FY2025 |
| Urban Sustainability Directors NetworkChicago | Form 990 | $11,313,811FY2024 |
| Lake Forest Open Lands AssociationMettawa | Form 990 | $9,393,257FY2026 |
| Conservation FoundationNaperville | Form 990 | $7,541,114FY2025 |
| Midwest Energy Efficiency AllianceChicago | Form 990 | $6,119,688FY2025 |
| Climate Vault IncChicago | Form 990 | $5,991,551FY2024 |
| Current Innovation NFPChicago | Form 990 | $5,868,289FY2024 |
| Jo Daviess Conservation Foundation IncElizabeth | Form 990 | $5,350,543FY2025 |
| Center for Neighborhood TechnologyChicago | Form 990 | $5,253,881FY2025 |
| Preservation Foundation of the Lakecounty Forest PreservesLibertyville | Form 990 | $4,421,804FY2025 |
| Natural Land InstituteRockford | Form 990 | $4,237,186FY2025 |
| Citizens for Conservation IncBarrington | Form 990 | $4,036,262FY2025 |
| Evanston Rebuilding WarehouseEvanston | Form 990 | $4,013,156FY2024 |
| Garfield Park Conservatory AllianceChicago | Form 990 | $3,935,930FY2025 |
| Illinois Audubon SocietySpringfield | Form 990 | $3,831,911FY2025 |
| Friends of the Forest PreservesChicago | Form 990 | $3,822,926FY2025 |
| Council of Great Lakes Governors IncRolling Meadows | Form 990 | $3,776,803FY2025 |
| Cub Consumer Education and ResearchfundChicago | Form 990 | $3,716,917FY2024 |
| Evergreen Climate InnovationsChicago | Form 990 | $3,672,788FY2024 |
| Friends of Wildlife Prairie ParkHanna City | Form 990 | $3,541,022FY2026 |
| The Wetlands InitiativeChicago | Form 990 | $3,465,450FY2024 |
| Kindness CampaignChicago | Form 990 | $3,424,555FY2024 |
| Passive House Institute Us IncChicago | Form 990 | $3,410,811FY2024 |
| Rockford Park District FoundationRockford | Form 990 | $3,409,135FY2025 |
| Anderson GardensRockford | Form 990 | $3,236,175FY2025 |
| Illinois Environmental Council Education FundSpringfield | Form 990 | $3,032,184FY2024 |
| Brushwood Center at Ryerson WoodsRiverwoods | Form 990 | $2,983,331FY2026 |
| Living Lands & WatersEast Moline | Form 990 | $2,843,496FY2025 |
| Heartlands ConservancyBelleville | Form 990 | $2,822,440FY2025 |
| Prairie Rivers NetworkChampaign | Form 990 | $2,785,687FY2025 |
| Green Era Educational NFPChicago | Form 990 | $2,686,117FY2024 |
| Healthy Schools CampaignChicago | Form 990 | $2,384,452FY2024 |
| Youth Conservation CorpsWaukegan | Form 990 | $2,147,768FY2024 |
| Black Oaks Center for Sustainable Renewable Living NFPChicago | Form 990 | $2,069,279FY2024 |
| Illinois Park and Recreation AssociationHinsdale | Form 990 | $2,043,337FY2024 |
| Grand Prairie FriendsUrbana | Form 990 | $1,819,272FY2025 |
| Southeast Environmental Task ForceChicago | Form 990 | $1,731,544FY2024 |
| Alliance for Water Efficiency NFPChicago | Form 990 | $1,705,378FY2025 |
| Food for Climate League IncEvanston | Form 990 | $1,579,554FY2024 |
| U S Green Building Council-Illinois ChapterChicago | Form 990 | $1,492,264FY2025 |
| Thorium Energy AllianceHarvard | Form 990 | $1,360,431FY2025 |
| Abraham Lincoln Memorial Garden FoundationSpringfield | Form 990 | $1,244,270FY2025 |
| Illinois Conservation FoundationSpringfield | Form 990 | $1,219,968FY2025 |
| Huisingh Family FoundationFulton | Form 990 | $1,155,024FY2025 |
| Clean Energy Jobs and Justice FundChicago | Form 990 | $1,148,718FY2025 |
| The Gaia-Movement Living Earth Green World Action USA IncChicago | Form 990 | $1,111,824FY2025 |
| Friends of Nachusa GrasslandsFranklin Grove | Form 990 | $1,000,139FY2025 |
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