| Sunrise Project IncWilmington | Form 990 | $61,111,981FY2024 |
| Climate Arc IncDover | Form 990 | $44,432,743FY2024 |
| Building Decarbonization CoalitionLewes | Form 990 | $14,995,817FY2024 |
| WRLD FoundationWilmington | Form 990 | $10,991,199FY2024 |
| Delaware Association of Conservation DistrictsDover | Form 990 | $6,722,950FY2025 |
| Partnership for the Delaware Estuary IncWilmington | Form 990 | $4,558,416FY2024 |
| Greater Lewes FoundationLewes | Form 990 | $4,290,149FY2025 |
| Delaware Nature Society IncHockessin | Form 990 | $4,039,490FY2024 |
| American Public Gardens AssociationWilmington | Form 990 | $3,774,374FY2025 |
| Center for the Inland Bays IncRehoboth | Form 990 | $3,535,864FY2025 |
| Delaware Center for Horticulture IncWilmington | Form 990 | $1,427,286FY2025 |
| Delaware Botanic Gardens IncDagsboro | Form 990 | $1,034,064FY2025 |
| Sussex Land Foundation IncLewes | Form 990 | $974,175FY2025 |
| Nanticoke Watershed Alliance IncSeaford | Form 990 | $942,802FY2025 |
| Community Resource Center IncRehoboth Beach | Form 990 | $932,003FY2025 |
| Climate Catalyst IncWilmington | Form 990 | $785,229FY2024 |
| Nature Is NonpartisanWilmington | Form 990 | $400,000FY2024 |
| Brights Creek Conservancy IncWilmington | Form 990 | $378,645FY2025 |
| International Association for Vegetation Science IncNewark | Form 990 | $357,792FY2025 |
| Sussex Health & Environmental NetworkSelbyville | Form 990 | $314,297FY2024 |
| Eco Plastic Products of Delaware IncWilmington | Form 990 | $287,858FY2025 |
| Roatan Marine Park International IncDover | Form 990 | $284,234FY2025 |
| Lewes in Bloom IncLewes | Form 990 | $234,201FY2026 |
| Integrated Vegetation Management Partners IncNewark | Form 990 | $212,623FY2025 |
| Kids Saving the Rainforest IncFrankford | Form 990 | $210,265FY2023 |
| Keep Delaware Beautiful IncNewark | Form 990 | $205,037FY2024 |
| Delaware Greenways IncWilmington | Form 990 | $174,120FY2024 |
| Plastic Free DelawareWilmington | Form 990-EZ | $156,837FY2025 |
| Newark Bike Project IncNewark | Form 990-EZ | $152,136FY2025 |
| Friends of Wilmington Parks IncMontchanin | Form 990-EZ | $127,164FY2025 |
| Earth Hacks FoundationClaymont | Form 990-EZ | $118,851FY2025 |
| Delaware River and Bay Lighthouse Foundation IncLewes | Form 990 | $111,433FY2025 |
| Foundation for Renewable Energy and the EnvironmentWilmington | Form 990-EZ | $91,778FY2024 |
| National Conservation District Employees Association IncDover | Form 990-EZ | $80,245FY2024 |
| Delaware Interfaith Power and LightDover | Form 990-EZ | $66,863FY2024 |
| Breathe Mongolia - Clean Air Coalition IncWilmington | Form 990-EZ | $65,884FY2024 |
| Save Groundwater FoundationLewes | Form 990-EZ | $63,090FY2024 |
| Conservation Agreement Fund a NJ Nonprofit CorporationLewes | Form 990 | $62,052FY2025 |
| Nanticoke River Watershed ConservancySeaford | Form 990 | $51,803FY2024 |
| Christina Conservancy IncWilmington | Form 990-N | No figure |
| Delaware Seashore Preservation Foundation IncOcean View | Form 990-N | No figure |
| Global Portal InstituteDover | Form 990-N | No figure |
| Friends of Forwood Preserve IncWilmington | Form 990-N | No figure |
| Friends of Brandywine SpringsWilmington | Form 990-N | No figure |
| Renew New England AllianceDover | Form 990-N | No figure |
| Rodney Square Conservancy IncWilmington | Form 990-N | No figure |
| Aviation Climate Taskforce IncWilmington | Form 990-N | No figure |
| Arasapha Garden Club IncNew Castle | Form 990-N | No figure |
| Friends of Lums Pond IncBear | Form 990-N | No figure |
| Clean Energy Research & Educationinstitute IncDover | Form 990-N | No figure |