| BIRDLIFE INTERNATIONAL | $41,292,150 | D32 | published | | United Kingdom | 2024 |
| POINT REYES BIRD OBSERVATORY | $31,721,037 | D32 | published | science: research education | Petaluma, CA | 2024 |
| INTERNATIONAL CRANE FOUNDATION INC | $17,664,216 | D32 | published | science: research education | Baraboo, WI | 2025 |
| FRIENDS OF TRACY AVIARY 09-20-93 | $17,425,585 | D32 | published | | Salt Lake Cty, UT | 2024 |
| ROCKY MOUNTAIN BIRD OBSERVATORY | $11,103,618 | D32 | published | science: research education | Brighton, CO | 2025 |
| ENVIRONMENT FOR THE AMERICAS INC | $6,989,701 | D32 | published | | Boulder, CO | 2024 |
| THE WILDERNESS PROJECT FOUNDATION | $5,747,870 | D32 | published | | Washington, DC | 2025 |
| PELICAN HARBOR SEABIRD STATION INC | $3,237,810 | D32 | published | science: research education | Miami, FL | 2024 |
| OASIS SANCTUARY FOUNDATION LTD | $2,972,237 | D32 | published | abuse: animal | Benson, AZ | 2024 |
| ALASKA RAPTOR REHABILITATION CENTER INC ARRC | $2,831,814 | D32 | published | | Sitka, AK | 2024 |
| HAWKWATCH INTERNATIONAL INC | $2,654,637 | D32 | published | science: research education | Salt Lake Cty, UT | 2024 |
| GREAT BASIN BIRD OBSERVATORY | $2,634,012 | D32 | published | | Reno, NV | 2024 |
| OWLS HILL NATURE SANCTUARY INC | $2,367,948 | D32 | published | science: research education | Brentwood, TN | 2024 |
| WATERFOWL FESTIVAL INC | $2,162,654 | D32 | published | | Easton, MD | 2024 |
| BIRD RESCUE CENTER | $2,002,601 | D32 | published | | Santa Rosa, CA | 2024 |
| NORMAN BIRD SANCTUARY TRUST | $1,994,113 | D32 | published | science: research education | Middletown, RI | 2024 |
| THE RAPTOR TRUST | $1,993,292 | D32 | published | domestic: animals | Millington, NJ | 2024 |
| WORLD BIRD SANCTUARY | $1,990,113 | D32 | published | science: research education | Valley Park, MO | 2024 |
| WILD BIRD FUND INC | $1,938,114 | D32 | published | science: research education | New York, NY | 2024 |
| KLAMATH BIRD OBSERVATORY | $1,922,610 | D32 | published | science: research education | Ashland, OR | 2025 |
| TRI-STATE BIRD RESCUE AND RESEARCH INC | $1,773,635 | D32 | published | domestic: animals | Newark, DE | 2024 |
| CAROLINA RAPTOR CENTER INC | $1,748,896 | D32 | published | | Huntersville, NC | 2024 |
| SOUTHAMPTON TOWNSHIP WILD FOWL ASSOCIATION INC | $1,673,095 | D32 | published | | Quogue, NY | 2024 |
| CASCADES RAPTOR CENTER | $1,509,886 | D32 | published | | Eugene, OR | 2024 |
| SAVE OUR SEABIRDS INC | $1,371,709 | D32 | published | | Sarasota, FL | 2024 |
| AVIAN CONSERVATION CENTER | $1,359,576 | D32 | published | science: research education | Awendaw, SC | 2024 |
| BILLFISH FOUNDATION INC | $1,254,767 | D32 | published | science: research education | Ft Lauderdale, FL | 2025 |
| SOUTH PADRE ISLAND BIRDING & NATURE CENTER | $1,190,275 | D32 | published | | S Padre Isle, TX | 2024 |
| GULF COAST BIRD OBSERVATORY INC | $1,183,551 | D32 | published | science: research education | Lake Jackson, TX | 2024 |
| ECOFLIX FOUNDATION INC | $1,178,551 | D32 | published | abuse: animal | Hidden Hills, CA | 2024 |
| FLORIDA KEYS WILD BIRD REHABILITATION CENTER INC | $1,086,859 | D32 | published | shelter: animal | Tavernier, FL | 2025 |
| WILD BIRD REHABILITATION | $979,930 | D32 | published | | Saint Louis, MO | 2025 |
| WILDFOWL TRUST OF NORTH AMERICA INC | $961,257 | D32 | published | | Grasonville, MD | 2025 |
| BLACK SWAMP BIRD OBSERVATORY | $866,928 | D32 | published | | Oak Harbor, OH | 2024 |
| GABRIEL FOUNDATION | $814,483 | D32 | published | | Elizabeth, CO | 2024 |
| SEASIDE SEABIRD SANCTUARY | $808,757 | D32 | published | | Indian Shores, FL | 2025 |
| KEY WEST WILDLIFE CENTER INC | $802,203 | D32 | published | | Key West, FL | 2024 |
| AVIAN HAVEN | $756,210 | D32 | published | | Freedom, ME | 2024 |
| ADIRONDACK CENTER FOR LOON CONSERVATION | $667,755 | D32 | published | science: research education | Ray Brook, NY | 2024 |
| AMERICAN SONGBIRD MANAGEMENT AND RECOVERY | $638,110 | D32 | published | | Ahmeek, MI | 2024 |
| MICKABOO COMPANION BIRD RESCUE | $632,260 | D32 | published | | San Jose, CA | 2024 |
| BELGIAN DRAFT HORSE CORPORATION OF AMERICA | $574,377 | D32 | inferred 0.55 | | Wabash, IN | 2024 |
| BIRD TREATMENT AND LEARNING CENTER | $549,007 | D32 | published | | Anchorage, AK | 2025 |
| HAWKS ALOFT INC | $544,884 | D32 | published | | Albuquerque, NM | 2024 |
| THE DALLAS COUNTY AUDUBON SOCIETY INC | $520,209 | D32 | published | | Dallas, TX | 2024 |
| CONGRESS OF THE BIRDS INC | $502,013 | D32 | published | | Providence, RI | 2024 |
| PAPAYAGO RESCUE HOUSE INC | $490,910 | D32 | published | | Acworth, GA | 2025 |
| FLORIDA EXOTIC BIRD SANCTUARY INC | $477,853 | D32 | published | abuse: animal | Hudson, FL | 2025 |
| SALT POND AREAS BIRD SANCTUARIES INC | $377,160 | D32 | published | science: research education | W Falmouth, MA | 2024 |
| AMERICAN BALD EAGLE FOUNDATION HAINES CHAPTER INC | $376,251 | D32 | published | | Haines, AK | 2024 |
| THE SANTA BARBARA BIRD SANCTUARY | $371,206 | D32 | published | abuse: animal | Summerland, CA | 2024 |
| NATURES EDUCATORS | $355,788 | D32 | published | | Florence, CO | 2025 |
| PHOENIX LANDING FOUNDATION | $344,580 | D32 | published | | Alexander, NC | 2025 |
| AVIAN SANCTUARY AND PROTECTION | $276,321 | D32 | published | domestic: animals | W Valley City, UT | 2024 |
| BLACK HILLS RAPTOR CENTER | $256,969 | D32 | published | science: research education | Caputa, SD | 2025 |
| ERIE BIRD OBSERVATORY | $254,965 | D32 | published | | Erie, PA | 2024 |
| PARROTS IN PARADISE SANCTUARY INC | $242,954 | D32 | published | | Kealakekua, HI | 2025 |
| PARROT HOPE RESCUE | $233,047 | D32 | published | | Mantua, OH | 2025 |
| FOR ELEPHANTS INC | $225,443 | D32 | inferred 0.50 | | Omaha, NE | 2024 |
| KERULOS CENTER | $223,367 | D32 | published | | Jacksonville, OR | 2024 |
| INTERNATIONAL BIRD CONSERVATION PARTNERSHIP | $211,513 | D32 | published | girls boys: girl scouts | Carmel, CA | 2025 |
| WILD BIRD RESCUE INC | $200,724 | D32 | published | | Wichita Falls, TX | 2025 |
| THREE RIVERS AVIAN CENTER INC | $199,582 | D32 | published | | Hinton, WV | 2025 |
| MARATHON WILD BIRD CENTER INC | $194,370 | D32 | published | | Marathon, FL | 2025 |
| SOARIN HAWK RAPTOR REHABILITATION INC | $189,251 | D32 | published | science: research education | Huntertown, IN | 2024 |
| INSTITUTE FOR SEABIRD RESEARCH & CO | $187,756 | D32 | published | science: research education | Anchorage, AK | 2025 |
| ON THE RUSH OF WINGS INC | $184,137 | D32 | inferred 0.85 | | Friendship, ME | 2011 |
| OLGA FLEISHER ORNITHOLOGICAL FOUNDATION INC | $181,831 | D32 | inferred 0.60 | | Rochester, NY | 2024 |
| FRIENDS OF BELIZE BIRD RESCUE INC | $180,100 | D32 | published | | Stuart, FL | 2024 |
| DISCOVERY BAY WILD BIRD RESCUE | $174,363 | D32 | published | | Port Townsend, WA | 2025 |
| THE CHLOE SANTUARY FOR PARROTS AND COCKATOOS INC | $154,206 | D32 | published | | Pahrump, NV | 2022 |
| BAIATA BIRD SANCTUARY | $150,660 | D32 | published | | Heathsville, VA | 2019 |
| OWL RIDGE RAPTOR CENTER INCORPORATED | $139,552 | D32 | published | | Washburn, TN | 2025 |
| W K KELLOGG BIRD SANCTUARY NECT | $138,104 | D32 | inferred 0.75 | | Cincinnati, OH | 2025 |
| PACIFIC BIRD CONSERVATION | $136,299 | D32 | published | science: research education | Hi Natl Park, HI | 2025 |
| FRIENDS OF GREAT SWAMP NATIONAL WILDLIFE REFUGE INC | $134,816 | D32 | published | | Basking Ridge, NJ | 2024 |
| WILD SKIES RAPTOR CENTER | $130,214 | D32 | published | | Bonner, MT | 2024 |
| ALASKA SONGBIRD INSTITUTE | $129,635 | D32 | published | science: research education | Fairbanks, AK | 2024 |
| HUMMINGBIRD FARM | $126,378 | D32 | published | | Pittsboro, NC | 2024 |
| BERKSHIRE BIRD PARADISE INC | $122,911 | D32 | published | | Petersburgh, NY | 2024 |
| BARNSWALLOW | $119,937 | D32 | published | shelter: animal | Wauconda, IL | 2025 |
| RAPTORS OF THE ROCKIES | $115,773 | D32 | published | | Florence, MT | 2025 |
| HOOS WOODS INC | $111,756 | D32 | published | | Whitewater, WI | 2025 |
| MIDWEST AVIAN ADOPTION & RESCUE SERVICES INC | $108,503 | D32 | published | | Saint Paul, MN | 2024 |
| THE PLUMERY | $107,579 | D32 | published | | San Francisco, CA | 2025 |
| OWL OCALA INC | $107,351 | D32 | published | | Ocala, FL | 2025 |
| WHELAN LAKE BIRD SANCTUARY INC | $106,804 | D32 | published | | Bonsall, CA | 2025 |
| MUTT MADNESS OF THE MS DELTA | $103,918 | D32 | published | | Greenville, MS | 2025 |
| FEATHERED FRIENDS FOREVER | $99,585 | D32 | published | abuse: animal | Harlem, GA | 2025 |
| CALIFORNIA RICELANDS WATERBIRD FOUNDATION | $99,380 | D32 | published | | Sacramento, CA | 2024 |
| TEXAS ANIMAL CONTROL ASSOCIATION INC | $98,482 | D32 | published | | Deer Park, TX | 2025 |
| FUTURE PHEASANTS INC | $94,234 | D32 | published | | Marion, ND | 2025 |
| AVIAN RECONDITIONING CENTER | $92,761 | D32 | published | | Apopka, FL | 2025 |
| MELBOURNE AVIAN RESCUE SANCTUARY | $92,323 | D32 | published | shelter: animal | Melbourne Bch, FL | 2025 |
| SAVING OUR AVIAN RESOURCES S O A R | $92,043 | D32 | published | | Dedham, IA | 2025 |
| FINE FEATHERED FRIENDS FOUNDATION | $91,387 | D32 | published | | El Segundo, CA | 2023 |
| CAPE FEAR PARROT SANCTUARY INC | $90,813 | D32 | published | abuse: animal | Pink Hill, NC | 2025 |
| DELAWARE VALLEY RAPTOR CENTER INC | $89,122 | D32 | published | | Milford, PA | 2024 |
| BIRD GARDENS OF NAPLES INC | $87,034 | D32 | published | | Naples, FL | 2024 |
| RAPTOR CHAPTER INC | $83,657 | D32 | published | | St Maries, ID | 2025 |