| Louise Duffy School P T OWest Hartford | Form 990-EZ | $56,508FY2025 |
| PTSA Connecticut IncFairfield | Form 990-EZ | $56,404FY2025 |
| Animal Welfare League of New London County IncorporatedGroton | Form 990 | $56,046FY2025 |
| PTSA Connecticut IncGreenwich | Form 990-EZ | $55,607FY2026 |
| The Parents and Teachers of Braeburn IncWest Hartford | Form 990-EZ | $55,449FY2025 |
| Christopher Potvin Scholar Athlete Fund IncOld Lyme | Form 990-EZ | $54,985FY2024 |
| Vernon Historical Society IncVernon Rockville | Form 990-EZ | $54,964FY2025 |
| Little League Baseball IncWindsor Locks | Form 990-EZ | $54,785FY2025 |
| PTSA Connecticut IncGreenwich | Form 990-EZ | $54,657FY2025 |
| Bunnell Marching Band Parents IncStratford | Form 990-EZ | $54,616FY2025 |
| Public Library Association of CheshireCheshire | Form 990-EZ | $54,195FY2025 |
| American Society of Heating Refrigerating & a-C EngineersCromwell | Form 990-EZ | $53,897FY2025 |
| Little League Baseball IncGroton | Form 990-EZ | $53,670FY2023 |
| Rotary Club of West Hartford Service Chest IncWest Hartford | Form 990-EZ | $53,590FY2025 |
| Unico National Torrington Chapter IncTorrington | Form 990-EZ | $53,542FY2025 |
| Music for the Earth IncLitchfield | Form 990-EZ | $52,159FY2025 |
| Meriden Soccer Club IncMeriden | Form 990-EZ | $51,944FY2025 |
| Cragin Memorial LibraryColchester | Form 990-EZ | $51,933FY2025 |
| Andrew Morehouse Trust Association IncNew Haven | Form 990 | $51,841FY2024 |
| New Canaan Public Access IncNew Canaan | Form 990-EZ | $51,213FY2025 |
| Parent Teacher OrganizationTolland | Form 990-EZ | $51,110FY2026 |
| Coventry Historical Society IncorpporatedCoventry | Form 990-EZ | $51,084FY2025 |
| Naugatuck Valley Housing Development CorporationWolcott | Form 990-EZ | $50,041FY2025 |
| Friends of Northwest Park IncWindsor | Form 990-EZ | $49,664FY2025 |
| Little League Baseball IncWeston | Form 990-EZ | $49,299FY2025 |
| PTSA Connecticut IncFairfield | Form 990-EZ | $49,154FY2025 |
| Police Athletic League of Stratford Connecticut IncStratford | Form 990-N | No figure |
| PTSA Connecticut IncFairfield | Form 990-EZ | $49,031FY2025 |
| PTSA Connecticut CongressRidgefield | Form 990-EZ | $48,973FY2025 |
| Danbury Connecticut Lions Charities IncDanbury | Form 990-EZ | $48,880FY2025 |
| Waterbury Hospital Auxiliary IncWaterbury | Form 990-EZ | $48,484FY2025 |
| Fine Arts Radio IncMonroe | Form 990-N | No figure |
| PTSA Connecticut IncHamden | Form 990-EZ | $47,046FY2026 |
| Bristol Choral Society IncBristol | Form 990-N | No figure |
| Art League of New BritainNew Britain | Form 990-N | No figure |
| New Haven Railroad Historical & Technical Association IncorporatedOld Saybrook | Form 990-EZ | $46,376FY2024 |
| West End Civic Association IncWest Hartford | Form 990-EZ | $46,225FY2024 |
| Glastonbury Free Academy IncGlastonbury | Form 990-N | No figure |
| Trumbull First Selectman S Golf Classic IncTrumbull | Form 990-EZ | $46,023FY2024 |
| Federated Garden Clubs of Connecticut IncWest Mystic | Form 990-EZ | $45,854FY2025 |
| Parent Teacher Association of Connecticut IncNorwalk | Form 990-EZ | $44,945FY2025 |
| Trumbull High School Scholarship Foundation IncTrumbull | Form 990-N | No figure |
| PTSA Connecticut CongressWestport | Form 990-N | No figure |
| Kent Singers IncKent | Form 990-N | No figure |
| Company of Fifers and Drummers IncIvoryton | Form 990-N | No figure |
| Connecticut Regional Convention Committee IncHamden | Form 990-EZ | $42,433FY2026 |
| Saint Patricks Scholarship Fund IncTrumbull | Form 990-N | No figure |
| Enfield Historical Society IncorporatedEnfield | Form 990 | $41,118FY2025 |
| The Unico Club of Waterbury IncorporatedWaterbury | Form 990-EZ | $40,334FY2025 |
| PTSA Connecticut IncWestport | Form 990-EZ | $40,306FY2025 |