| EarthEcho InternationalEIN 95-4789334 | Environment | DC | $698,764Small | 82.66 |
| EarthjusticeEIN 94-1730465 | Environment | CA | $51,564,754Large | 94.85 |
| EarthplaceEIN 06-0740523 | Environment | CT | $2,425,838Small | 85.32 |
| EarthShareEIN 52-1601960 | Environment | MD | $6,743,365Mid-sized | 76.31 |
| EarthShare CaliforniaEIN 94-2840364 | Environment | CA | $1,349,632Small | 73.23 |
| EarthShare GeorgiaEIN 58-2022001 | Environment | GA | $635,892Small | 80.68 |
| EarthShare TexasEIN 74-2627643 | Environment | TX | $407,224Small | 84.86 |
| EARTHWORKSEIN 52-1557765 | Environment | DC | $3,301,953Small | 94.74 |
| ecoAmericaEIN 20-3895611 | Environment | DC | $4,482,513Mid-sized | 88.77 |
| EcoLogic Development FundEIN 25-1704582 | Environment | MA | $1,487,137Small | 81.51 |
| Ecology CenterEIN 38-1912803 | Environment | MI | $1,941,562Small | 93.09 |
| EcotrustEIN 93-1050144 | Environment | OR | $5,895,078Mid-sized | 88.19 |
| Emerald Necklace ConservancyEIN 04-3414988 | Environment | MA | $1,687,443Small | 83.01 |
| Environment America Research and Policy CenterEIN 13-4339865 | Environment | CO | $3,179,487Small | 83.13 |
| Environmental Advocates of New YorkEIN 22-2360736 | Environment | NY | $1,251,586Small | 99.79 |
| Environmental and Energy Study InstituteEIN 52-1268030 | Environment | DC | $1,296,571Small | 100.00 |
| Environmental Defense CenterEIN 77-0061994 | Environment | CA | $1,135,564Small | 90.57 |
| Environmental Grantmakers AssociationEIN 20-8817646 | Environment | NY | $2,539,563Small | 91.44 |
| Environmental Health CoalitionEIN 95-3798792 | Environment | CA | $3,829,007Mid-sized | 86.60 |
| Environmental InitiativeEIN 41-1718834 | Environment | MN | $2,064,185Small | 96.07 |
| Environmental Integrity ProjectEIN 20-1326922 | Environment | DC | $3,168,637Small | 84.42 |
| Environmental Investigation AgencyEIN 52-1654284 | Environment | DC | $4,791,938Mid-sized | 89.39 |
| Environmental Law Alliance WorldwideEIN 94-3116602 | Environment | OR | $1,816,495Small | 95.34 |
| Environmental Law and Policy CenterEIN 36-3866530 | Environment | IL | $6,344,275Mid-sized | 93.30 |
| Environmental Law InstituteEIN 52-0901863 | Environment | DC | $5,604,514Mid-sized | 92.44 |
| Environmental Research and Education FoundationEIN 52-1804051 | Environment | NC | $2,511,072Small | 95.50 |
| Environmental Working GroupEIN 52-2148600 | Environment | DC | $9,318,340Mid-sized | 91.51 |
| Everglades FoundationEIN 59-3228899 | Environment | FL | $8,149,416Mid-sized | 91.03 |
| Fairchild Tropical Botanic GardenEIN 59-0668480 | Environment | FL | $8,735,589Mid-sized | 89.37 |
| Florida Oceanographic SocietyEIN 59-1114306 | Environment | FL | $1,649,436Small | 81.91 |
| Fontenelle ForestEIN 47-6026109 | Environment | NE | $2,448,954Small | 87.95 |
| Forest Park ForeverEIN 43-1427062 | Environment | MO | $8,071,854Mid-sized | 91.33 |
| Forest TrendsEIN 52-2135531 | Environment | DC | $10,556,855Mid-sized | 86.54 |
| Frederik Meijer Gardens & Sculpture FoundationEIN 38-3118579 | Environment | MI | $4,455,748Mid-sized | 91.46 |
| Frederik Meijer Gardens & Sculpture ParkEIN 38-2394044 | Environment | MI | $19,104,355Large | 90.50 |
| Friends of AcadiaEIN 01-0425071 | Environment | ME | $3,913,667Mid-sized | 93.37 |
| Friends of Great Smoky Mountains National ParkEIN 62-1564782 | Environment | NC | $2,509,667Small | 84.00 |
| Friends of the Arava InstituteEIN 11-3485736 | Environment | MA | $1,440,708Small | 82.81 |
| Friends of the EarthEIN 23-7420660 | Environment | DC | $10,291,770Mid-sized | 94.64 |
| Friends of the High LineEIN 31-1734086 | Environment | NY | $16,615,703Large | 84.33 |
| Friends of the Mississippi RiverEIN 41-1763226 | Environment | MN | $2,220,748Small | 88.00 |
| Friends of the National ArboretumEIN 52-1257712 | Environment | DC | $1,291,668Small | 92.93 |
| Friends of the RiverEIN 94-2400210 | Environment | CA | $457,705Small | 80.53 |
| Friends of the Urban ForestEIN 94-2699528 | Environment | CA | $2,523,744Small | 86.32 |
| Fund for Park Avenue New YorkEIN 13-4061153 | Environment | NY | $1,093,811Small | 80.43 |
| Galapagos ConservancyEIN 13-3281486 | Environment | VA | $4,584,984Mid-sized | 93.13 |
| Galveston Bay FoundationEIN 76-0279876 | Environment | TX | $6,699,575Mid-sized | 92.92 |
| Garfield Park Conservatory AllianceEIN 36-4200490 | Environment | IL | $1,410,897Small | 86.16 |
| Georgia ConservancyEIN 58-1027246 | Environment | GA | $1,625,987Small | 86.47 |
| Geos InstituteEIN 93-0880205 | Environment | OR | $861,909Small | 82.30 |
| Glacier National Park ConservancyEIN 56-2579734 | Environment | MT | $3,780,898Mid-sized | 89.63 |
| Global Green USAEIN 77-0387124 | Environment | CA | $2,390,592Small | 82.44 |
| GlynwoodEIN 13-3852957 | Environment | NY | $4,420,244Mid-sized | 89.85 |
| Golden Gate National Parks ConservancyEIN 94-2781708 | Environment | CA | $55,050,170Large | 90.38 |
| Grand Canyon TrustEIN 86-0512633 | Environment | AZ | $4,494,419Mid-sized | 95.38 |
| Grand Teton National Park FoundationEIN 83-0322668 | Environment | WY | $19,570,717Large | 98.23 |
| Great Meadow FoundationEIN 52-1257702 | Environment | VA | $1,975,821Small | 87.74 |
| Great River GreeningEIN 41-1940024 | Environment | MN | $2,350,895Small | 92.92 |
| Great Swamp Watershed AssociationEIN 22-2403906 | Environment | NJ | $620,590Small | 97.82 |
| Greater Des Moines Botanical GardenEIN 42-0540765 | Environment | IA | $3,254,731Small | 91.62 |