| Volgenau Foundation | | Mclean, VA | National | 6 | 2024 | $3,450,000 |
| Krieger Charitable Trust | | Boston, MA | Local | 5 | 2024 | $353,582 |
| Richard King Mellon Foundation Dtd 01-01-47 | | Ligonier, PA | Local | 1 | 2024 | $200,000 |
| Gold Family Charitable Trust | | Briarcliff, NY | National | 5 | 2024 | $169,500 |
| Steven M & Joyce E Tadler Charitable Tr | | Kiawah Island, SC | Local | 3 | 2024 | $160,000 |
| Fidelity Foundation | | Boston, MA | National | 1 | 2024 | $150,000 |
| R J Salerno Foundation | | Wilmington, DE | National | 7 | 2024 | $115,000 |
| Trust for Public Land | | San Francisco, CA | National | 2 | 2024 | $58,000 |
| Charles Foundation Inc | | Morristown, NJ | National | 3 | 2024 | $55,000 |
| Msb Cockayne Fund Inc | | Nashville, TN | National | 4 | 2024 | $42,000 |
| Bancroft Foundation | | Crested Butte, CO | Local | 1 | 2024 | $40,000 |
| Neall Family Charitable Foundation | | Haymarket, VA | Local | 8 | 2024 | $39,000 |
| The Thomas Rosato Foundation | | Wilmington, DE | National | 7 | 2024 | $29,000 |
| Courtney Knight Gaines Foundation Inc | | Savannah, GA | Local | 5 | 2024 | $27,000 |
| Martin R Prince Charitable Foundation | | New York, NY | National | 8 | 2024 | $26,500 |
| Tisbest Philanthropy | | Seattle, WA | National | 3 | 2024 | $24,544 |
| Willow Branch Foundation | | Boca Raton, FL | Local | 5 | 2024 | $23,000 |
| Stanley and Rela Banks Foundation Inc | | Florham Park, NJ | Local | 1 | 2024 | $21,000 |
| Reed Foundation Inc | | Atlanta, GA | Local | 4 | 2024 | $19,000 |
| Harriet H Nicol Charitable Foundation | | Boston, MA | National | 2 | 2024 | $18,000 |
| Lmac Foundation Inc | | Delaplane, VA | National | 5 | 2024 | $17,500 |
| Betty a Lewis Environmental Charitable Tr | | Appleton, WI | National | 6 | 2024 | $15,670 |
| The Keith Campbell Foundation for the Environment Inc | | Bethesda, MD | National | 1 | 2024 | $15,000 |
| Thackston Family Foundation | | | Local | 5 | 2024 | $12,500 |
| David Wallace Smith and Joan Stowell Smith Charitable Foundatio | | Wilmington, DE | National | 4 | 2024 | $12,000 |
| Rewild | | Austin, TX | National | 1 | 2024 | $10,000 |
| The Foundation for Enhancing Communities | | Harrisburg, PA | Local | 1 | 2024 | $10,000 |
| Massengill-Defriece Foundation Inc | | Bristol, TN | Local | 1 | 2024 | $10,000 |
| Adele M Thomas Charitable Foundation Inc | | Falls Church, VA | National | 5 | 2024 | $9,000 |
| Johnson-Kazar Charitable Foundationinc | | Green, OH | Local | 7 | 2024 | $8,500 |
| Girouard Family Foundation | | Burr Ridge, IL | Local | 5 | 2024 | $8,000 |
| Ahrens Fam Foundation Tr | | Louisville, KY | Local | 5 | 2024 | $8,000 |
| Peterson Family Foundation | | Fairfax, VA | Local | 5 | 2024 | $7,500 |
| Steven Broitman Foundation | | Wilmington, DE | National | 2 | 2024 | $7,500 |
| Phillips Family Foundation | | Midlothian, VA | National | 3 | 2024 | $7,500 |
| Kurtz Family Foundation Inc | | Alpine, NJ | National | 3 | 2024 | $7,500 |
| The Okun Family Foundation Inc | | | National | 5 | 2024 | $7,100 |
| John a Rodger Jr Foundation Inc | | East Meadow, NY | National | 7 | 2024 | $7,000 |
| Cerity Partners Foundation | | Novato, CA | Local | 1 | 2024 | $7,000 |
| Fernandes Family Foundation | | Naples, FL | Local | 2 | 2024 | $6,000 |
| Elinor Beidler Siklossy Foundation | | Chicago, IL | National | 7 | 2024 | $5,500 |
| Catherine Paris Foundation Inc | | St Augustine, FL | National | 5 | 2024 | $5,000 |
| 1772 Foundation Inc | | Pomfret Ctr, CT | National | 1 | 2024 | $5,000 |
| Bailey Family Foundation Inc | | Vero Beach, FL | National | 7 | 2024 | $4,450 |
| Charlotte Foundation | | Boston, MA | Local | 4 | 2024 | $4,400 |
| Murry and Florence Schott Charitable Foundation Inc | | Bethesda, MD | National | 2 | 2024 | $3,500 |
| Marian Foundation | | Chapel Hill, NC | National | 6 | 2024 | $3,318 |
| Weil Foundation | | Wilmington, NC | National | 2 | 2024 | $3,144 |
| Tosa Foundation | | Portola Vally, CA | Local | 4 | 2024 | $3,000 |
| Space Technology & Research Foundation Inc | | Little Falls, NJ | National | 4 | 2024 | $3,000 |
| Esther & Morton Wohlgemuth | | Brooklyn, NY | National | 6 | 2024 | $3,000 |
| Fred and Maxi Bruhns Foundation Inc | | Pittsburgh, PA | National | 2 | 2024 | $3,000 |
| Beard Young Family Foundation | | Huntsville, AL | Local | 5 | 2024 | $2,500 |
| Yang Foundation | | New Hartford, NY | National | 3 | 2024 | $2,500 |
| Henry C & Karin J Barkhorn Foundation | | New York, NY | Local | 1 | 2024 | $2,500 |
| 5 51 5 Foundation | | New York, NY | Local | 2 | 2024 | $2,000 |
| Dammann Fund Inc | | New York, NY | Local | 5 | 2024 | $1,750 |
| Gussel Foundation Inc | | Madison, WI | Local | 1 | 2024 | $1,500 |
| Shoval Foundation | | Wilkes Barre, PA | Local | 6 | 2024 | $1,350 |
| Archie S Wingfield Jr Charitable Tr Under Ex a Para E of Archie S W | | Vero Beach, FL | Local | 5 | 2024 | $1,250 |
| Kelly S Byron Foundation Inc | | Laud By Sea, FL | Local | 5 | 2024 | $1,250 |
| Davis Foundation | | Atlanta, GA | Local | 4 | 2024 | $1,150 |
| Carver Delaney Families Foundation Inc | | Morristown, NJ | National | 5 | 2024 | $1,100 |
| Bane Foundation | | Salem, VA | National | 1 | 2024 | $1,000 |
| William C Anderson Wilderness and Wildlife Preservation Soc Inc | | Caldwell, NJ | National | 6 | 2024 | $850 |
| Frank C Marino Foundation Inc | | Baltimore, MD | Local | 4 | 2024 | $600 |
| Ross Family Foundation | | Philadelphia, PA | Local | 3 | 2024 | $525 |
| R Scott Rosenberger Charitablefoundation Inc | | Baltimore, MD | National | 3 | 2024 | $500 |
| Farmer Lee Foundation Inc | | Athens, GA | National | 1 | 2024 | $500 |
| Edmunds Family Foundation | | Plainfield, NJ | National | 6 | 2024 | $500 |
| Abner & Mildred Levine Family Foundation | | Boca Raton, FL | National | 1 | 2024 | $250 |
| Douglas W and Wanda K Morgan Foundation | | Travelers Rst, SC | National | 1 | 2024 | $160 |
| Alliant Credit Union Foundation | | Chicago, IL | National | 1 | 2024 | $50 |
| National Park Foundation | | Washington, DC | National | 4 | 2023 | $384,000 |
| The Conservation Fund a Nonprofit Corporation | | Arlington, VA | National | 1 | 2023 | $360,259 |
| Davies Family Foundation Inc | | Chevy Chase, MD | Local | 4 | 2023 | $45,700 |
| W L Lyons Brown Foundation | | | Local | 3 | 2023 | $32,258 |
| Norman J Fisher and Doris Fisher Foundation | | Annapolis, MD | Local | 6 | 2023 | $26,000 |
| National Wilderness Stewardship Alliance | | Del Norte, CO | National | 1 | 2023 | $19,399 |
| Steven C Leuthold Family Foundation | | Brevard, NC | National | 1 | 2023 | $10,000 |
| John T and Theresa D Cederholm Foundation Uta 07142005 | | Marion, MA | National | 6 | 2023 | $5,750 |
| John and Sarah Freeman Foundationinc | | Washington, DC | Local | 1 | 2023 | $5,000 |
| Mcadams Foundation | | Reston, VA | National | 1 | 2023 | $4,000 |
| The Samuel and Irene Saligman Charitable Fund | | Newtown Sq, PA | Local | 5 | 2023 | $3,650 |
| George and Mary Jo Budig Family Foundation | | Covington, KY | Local | 5 | 2023 | $1,300 |
| Brooks Foundation | | Teton Village, WY | National | 4 | 2023 | $1,000 |
| Joe and Pat Edwards Foundation Inc | | Barnesville, GA | Local | 2 | 2023 | $750 |
| Semrod Family Private Foundation | | Naples, FL | National | 4 | 2023 | $750 |
| The Jeffrey P Mckee Foundation | | Wilmington, DE | National | 1 | 2023 | $500 |
| Dominion Energy Charitable Foundation | | Richmond, VA | Local | 1 | 2023 | $405 |
| Kohrman Family Foundation | | Brooklyn, OH | Local | 1 | 2023 | $300 |
| Gaylord and Dorothy Donnelley Foundation | | Chicago, IL | National | 2 | 2023 | $300 |
| James and Melanie Crockard Foundation | | Canonsburg, PA | Local | 2 | 2023 | $200 |
| Morosani Foundation | | Asheville, NC | Local | 2 | 2023 | $200 |
| Patrick Foundation Tr | | Wilmington, DE | Local | 2 | 2023 | $150 |
| Bank of New Hampshire Charitable Foundation | | Laconia, NH | Local | 1 | 2023 | $25 |
| Larry and Karen Mulder Foundation | | Zeeland, MI | Local | 1 | 2022 | $100,000 |
| Doris Duke Charitable Foundation Inc | | New York, NY | National | 1 | 2022 | $85,000 |
| National Forest Foundation | | Missoula, MT | National | 1 | 2022 | $41,287 |
| Allan B Roby and Frances M Roby Charitable Trust | | Lyme, NH | National | 3 | 2022 | $35,000 |
| Horne Family Charitable Foundation Inc | | Boston, MA | National | 2 | 2022 | $30,000 |
| Coastal Community Foundation of South Carolina Inc | | N Charleston, SC | Local | 3 | 2022 | $30,000 |
| National Park Trust Inc | | Rockville, MD | National | 1 | 2022 | $25,000 |
| Barton J Ingraham & Gail G Ingraham Foundation | | | Local | 1 | 2022 | $20,000 |
| Hayes Foundation | | New Haven, CT | National | 4 | 2022 | $17,500 |
| Danny Cramer Foundation | | | — | 3 | 2022 | $16,505 |
| Forney Family Foundation Inc | | Unionville, PA | Local | 4 | 2022 | $2,000 |
| Kristin and Michael Reed Familyfoundation Inc | | New Canaan, CT | — | 2 | 2022 | $1,000 |
| Rita Morgan Charitable Foundation Inc | | Aventura, FL | National | 1 | 2022 | $1,000 |
| Ann B Zekauskas Family Foundation Inc | | Wilmington, DE | National | 1 | 2022 | $500 |
| Double-R Foundation | | New York, NY | Local | 2 | 2022 | $400 |
| Ballard Angels Inc | | Mountain Top, PA | National | 1 | 2022 | $150 |
| Westrock Foundation | | Atlanta, GA | National | 1 | 2022 | $125 |
| Nash Foundation | | Wilmington, DE | Local | 1 | 2022 | $100 |
| The Grimm Foundation | | Waymart, PA | National | 1 | 2022 | $100 |
| Davis Conservation Foundation | | Yarmouth, ME | Local | 1 | 2021 | $15,000 |
| Community Foundation of Frederick County Maryland Incorporated | | Frederick, MD | Local | 1 | 2021 | $10,660 |
| Partnership for the National Trails System | | Washington, DC | National | 1 | 2021 | $9,285 |
| Short Family Foundation | | Kansas City, MO | Local | 1 | 2021 | $2,000 |
| Dorothy Cate and Thomas F Frist Foundation | | Nashville, TN | Local | 1 | 2021 | $1,000 |
| Karen Stirling Family Foundation | | Wilmington, DE | National | 1 | 2021 | $1,000 |
| Fredrick D and Karen G Schaufeld Family Foundation | | Greensboro, NC | National | 1 | 2021 | $1,000 |
| Hugh M Inman Foundation Inc | | Atlanta, GA | Local | 1 | 2021 | $500 |
| Richie Family Foundation Inc | | Asheville, NC | Local | 2 | 2021 | $450 |
| Rainbow Heritage Foundation | | Fremont, CA | National | 1 | 2021 | $250 |
| Russell's Garden Center Charitable Foundation Inc | | | — | 2 | 2021 | $200 |
| Brown Advisory Charitable Foundation Inc | | Baltimore, MD | Local | 1 | 2021 | $100 |
| Elsie P & Lucius B Mccowan Private Foundation | | Elma, NY | Local | 1 | 2021 | $100 |
| The Rei Foundation | | | — | 1 | 2020 | $25,000 |
| Powell Charitable Foundation | | Salem, VA | Local | 1 | 2020 | $10,000 |
| Moxley Family Foundation | | Herndon, VA | National | 1 | 2020 | $5,000 |
| Macleod Charitable Foundation Inc | | Fort Collins, CO | National | 1 | 2020 | $4,500 |
| Frenzel Family Charitable Foundation | | Philadelphia, PA | National | 2 | 2020 | $3,000 |
| Rucker Family Foundation | | Peoria, IL | Local | 2 | 2020 | $1,500 |
| Sidney and Bernice Clyman Family Foundation | | San Rafael, CA | Local | 1 | 2020 | $1,000 |
| The Ward & Shelley Cammack Family Foundation | | | — | 1 | 2020 | $1,000 |
| Patterson Family Foundation Inc | | Atlanta, GA | Local | 1 | 2020 | $1,000 |
| Don and Marilyn Allan Family Foundation | | West Hartford, CT | Local | 1 | 2020 | $600 |
| Rowny Foundation | | Bethesda, MD | Local | 2 | 2020 | $600 |
| David C Petrick and Ellen R Petrick Foundation | | Frankfort, MI | Local | 1 | 2020 | $500 |
| The William and Diane Nitterhouse Foundation | | Chambersburg, PA | Local | 1 | 2020 | $500 |
| Kurzweil Family Foundation Inc | | San Rafael, CA | National | 1 | 2020 | $100 |
| Lynn Favrot Nolan Family Fund | | Lagrangeville, NY | Local | 1 | 2020 | $100 |
| Chattanooga Christian Community Foundation | | Chattanooga, TN | Local | 1 | 2020 | $50 |
| Bass Pro Shops & Cabelas Outdoor Fund | | Springfield, MO | National | 1 | 2019 | $70,000 |
| James M Cox Foundation of Ga Inc | | Atlanta, GA | Local | 1 | 2019 | $60,000 |
| Whitehead Foundation Inc | | Lenox, MA | National | 2 | 2019 | $30,000 |
| Garden Homes Fund | | Stamford, CT | Local | 2 | 2019 | $10,000 |
| Rolf and Carrie Tweeten Charitable Foundation | | | Local | 1 | 2019 | $2,000 |
| Charles and Brenda Larsen Family Foundation | | Johns Island, SC | National | 2 | 2019 | $200 |
| Alden Family Foundation | | Columbia, MO | Local | 1 | 2019 | $100 |
| Harken Foundation | | Highland Park, IL | Local | 1 | 2019 | $100 |
| National Audubon Society Inc | | New York, NY | National | 1 | 2018 | $24,447 |
| Esmond Nissim Foundation Inc | | Bronxville, NY | Local | 1 | 2018 | $2,500 |
| Joseph and Katherine Macari Foundation Inc | | New York, NY | Local | 1 | 2018 | $1,500 |
| Samuel and Gertrude Horovitz Family Foundation | | Tampa, FL | Local | 1 | 2017 | $3,000 |