Home Organizations Connecticut Every cause Civil rights and advocacy 90 Environment and climate 436 Labor unions and worker centers 582 Housing and homelessness 378 Immigrant services and rights 38 Food banks and hunger 135 Legal aid 17 Voting and civic participation 14 Community health and reproductive care 29 LGBTQ+ services and rights 21 Criminal justice reform and reentry 29 Civil rights and advocacy (90) Organization City Type Revenue Save The Children Action NetworkEIN 46-5465189 · filings Fairfield Advocacy, 501(c)(4) $7.5 million Center For Childrens Advocacy IncEIN 06-1489575 · filings Hartford Charity, 501(c)(3) $3.6 million Connecticut Fair Housing Center IncEIN 06-1453727 · filings Hartford Charity, 501(c)(3) $2.9 million American Civil Liberties Union Foundation Of Connecticut IncEIN 06-0871754 · filings Hartford Charity, 501(c)(3) $2.4 million Disability Rights Connecticut IncEIN 81-3156636 · filings Hartford Charity, 501(c)(3) $2.3 million American Civil Liberties Union Of Connecticut IncEIN 45-2857664 · filings Hartford Advocacy, 501(c)(4) $1.3 million Greater New Haven Disability Rights Activists IncEIN 06-1266189 · filings West Haven Charity, 501(c)(3) $1.1 million Faithful AmericaEIN 35-2630679 · filings New Haven Advocacy, 501(c)(4) $771,482 Fight Voter Fraud IncEIN 84-1778932 · filings Middletown Advocacy, 501(c)(4) $750,490 Family Institute Of Connecticut IncEIN 06-1282690 · filings Hartford Charity, 501(c)(3) $719,572 Mothers United Against Violence IncEIN 41-2262294 · filings Hartford Charity, 501(c)(3) $702,453 University Network For Internat Training Anduniversity Network ForEIN 83-1413195 · filings Stamford Charity, 501(c)(3) $586,299
The 90 largest →
Environment and climate (436) Organization City Type Revenue Aspetuck Land Trust IncEIN 06-6088827 · filings Westport Charity, 501(c)(3) $24.4 million Ocean Exploration Trust IncEIN 83-0488383 · filings New London Charity, 501(c)(3) $19.3 million Sound Waters IncEIN 06-1263947 · filings Stamford Charity, 501(c)(3) $12.7 million Inclusive Prosperity Capital IncEIN 83-0808658 · filings Hartford Charity, 501(c)(3) $10.8 million Save The Sound IncEIN 06-0990195 · filings New Haven Charity, 501(c)(3) $9.9 million Northwest Connecticut Land Conservancy IncEIN 06-6082034 · filings Kent Charity, 501(c)(3) $9.6 million The Connecticut Audubon Society IncorporatedEIN 06-0653531 · filings Fairfield Charity, 501(c)(3) $8.4 million Keep America Beautiful IncEIN 13-1761633 · filings Stamford Charity, 501(c)(3) $7.7 million Garden Conservancy IncEIN 13-3570145 · filings Greenwich Charity, 501(c)(3) $7.7 million Steep Rock Association IncEIN 06-6069060 · filings Washington Dt Charity, 501(c)(3) $4.6 million Connecticut Citizen Research Group IncEIN 06-0889894 · filings Hartford Charity, 501(c)(3) $4.3 million Earthplace The Nature Discovery Center IncEIN 06-0740523 · filings Westport Charity, 501(c)(3) $4.1 million
The 300 largest →
Labor unions and worker centers (582) Organization City Type Revenue Service Employees International UnionEIN 06-0991885 · filings Hartford Labor organization, 501(c)(5) $19.3 million International Union Of Journeymen & Allied TradesEIN 71-0301129 · filings Danbury Labor organization, 501(c)(5) $11.9 million American Federation Of State County & Municipal EmployeesEIN 06-0797646 · filings New Britain Labor organization, 501(c)(5) $11.6 million International Union Of Operating Engineers Local Union 478EIN 06-0401158 · filings Hamden Labor organization, 501(c)(5) $9.4 million American Federation Of TeachersEIN 06-6069203 · filings Rocky Hill Labor organization, 501(c)(5) $7.6 million Laborers International Union Of North AmericaEIN 06-6084948 · filings Hartford Labor organization, 501(c)(5) $7.1 million Connecticut State Employees AssociationEIN 06-0305224 · filings Hartford Labor organization, 501(c)(5) $6.6 million International Association Of Machinists & Aerospace WorkersEIN 02-0599079 · filings New London Labor organization, 501(c)(5) $6.3 million International Brotherhood TeamstersEIN 06-0776845 · filings Stratford Labor organization, 501(c)(5) $5.8 million International Brotherhood Of Electrical WorkersEIN 06-0856238 · filings Manchester Labor organization, 501(c)(5) $4.8 million International Union Of Painters And Allied TradesEIN 06-1269651 · filings Middletown Labor organization, 501(c)(5) $4.5 million United Food And Commercial Workers International UnionEIN 06-0605499 · filings Westport Labor organization, 501(c)(5) $4.2 million
The 300 largest →
Housing and homelessness (378) Organization City Type Revenue Mclean Affiliates IncEIN 26-1960246 · filings Simsbury Charity, 501(c)(3) $40.8 million Connecticut Foundation Solutions Indemnity Company IncEIN 83-1054554 · filings Ashford Charity, 501(c)(3) $38.2 million Journey Found IncEIN 46-2753734 · filings Manchester Charity, 501(c)(3) $18.1 million Columbus HouseEIN 22-2511873 · filings New Haven Charity, 501(c)(3) $16.9 million Housing Development Fund IncEIN 06-1276156 · filings Stamford Charity, 501(c)(3) $12.3 million New Reach IncEIN 22-3037451 · filings New Haven Charity, 501(c)(3) $9.8 million Mercy Housing And Shelter CorporationEIN 06-1090211 · filings Hartford Charity, 501(c)(3) $9.5 million Masonicare At Chester Village IncEIN 82-2936624 · filings Wallingford Charity, 501(c)(3) $8.8 million The Open Door Shelter IncEIN 22-2536909 · filings Norwalk Charity, 501(c)(3) $7.8 million Chrysalis Center Housing Development CorporationEIN 86-1766233 · filings Hartford Charity, 501(c)(3) $7.7 million Capital For Change IncEIN 06-0842738 · filings Wallingford Charity, 501(c)(3) $7.4 million Eastern Connecticut Housing Opportunities IncEIN 06-1275523 · filings New London Charity, 501(c)(3) $7.2 million
The 300 largest →
Immigrant services and rights (38) Organization City Type Revenue Building One Community CorpEIN 27-5024317 · filings Stamford Charity, 501(c)(3) $6.7 million Connecticut Worker CenterEIN 83-4260663 · filings Bridgeport Charity, 501(c)(3) $237,703 Queen Ann Nzinga Center IncEIN 26-2803114 · filings Plainville Charity, 501(c)(3) $198,212 New Milford Refugee ResettlementEIN 87-1767376 · filings New Milford Charity, 501(c)(3) $195,362 Advocate Community Care Agency IncEIN 06-1529592 · filings West Hartford Charity, 501(c)(3) $104,573 Connecticut Immigrant And Refugee Coalition IncEIN 06-1623555 · filings West Hartford Charity, 501(c)(3) $85,311 Korean-american Society Of ConnecticutEIN 51-0201369 · filings Hamden Charity, 501(c)(3) $77,969 Moya Ukraine IncEIN 88-1730192 · filings Wethersfield Charity, 501(c)(3) $20,705 Raices Latinas IncEIN 33-1826915 · filings Meriden Charity, 501(c)(3) $6,817 Association Of Senegalese In ConnecticutEIN 84-2410471 · filings Norwich Charity, 501(c)(3) $2,114 United Haitian American SocietyEIN 01-0613380 · filings Norwalk Charity, 501(c)(3) — Hispanic Alliance Of Southeastern Connecticut IncEIN 02-0573328 · filings New London Charity, 501(c)(3) —
The 38 largest →
Food banks and hunger (135) Organization City Type Revenue Food Bank Of Lower Fairfield County IncEIN 02-0684220 · filings Stamford Charity, 501(c)(3) $3.8 million Daily Bread - An Ecumenical Food Pantry IncEIN 06-1152682 · filings Danbury Charity, 501(c)(3) $3.8 million Covenant Soup Kitchen IncEIN 20-3498376 · filings Willimantic Charity, 501(c)(3) $2.6 million Shoreline Soup Kitchens & PantriesEIN 46-3773017 · filings Essex Charity, 501(c)(3) $2.5 million Chabad Jewish Center Of Stamford IncEIN 36-4799454 · filings Stamford Charity, 501(c)(3) $1.7 million Loaves And Fishes New Haven IncEIN 83-3038362 · filings New Haven Charity, 501(c)(3) $1.6 million Masters Manna IncEIN 20-5643387 · filings Wallingford Charity, 501(c)(3) $1.6 million Enfield Food Shelf IncEIN 06-1327533 · filings Enfield Charity, 501(c)(3) $1.6 million Friendly Hands Food Bank IncEIN 31-1639994 · filings Torrington Charity, 501(c)(3) $1.5 million Seymour Oxford Food Bank IncEIN 36-4798369 · filings Seymour Charity, 501(c)(3) $1.3 million Healing Meals Foundation CorporationEIN 47-5464291 · filings Bloomfield Charity, 501(c)(3) $1.2 million Angel Of Edgewood IncEIN 85-3536488 · filings Hartford Charity, 501(c)(3) $920,412
The 135 largest →
Legal aid (17) Organization City Type Revenue Connecticut Bar Foundation IncEIN 06-6079763 · filings Hartford Charity, 501(c)(3) $39.3 million Connecticut Legal Services IncEIN 06-0955461 · filings Middletown Charity, 501(c)(3) $15.6 million Greater Hartford Legal Aid IncEIN 06-0730611 · filings Hartford Charity, 501(c)(3) $6.4 million Statewide Legal Services Of Connecticut IncEIN 06-1445097 · filings Wethersfield Charity, 501(c)(3) $5.2 million Connecticut Veterans Legal CenterEIN 27-0963659 · filings West Haven Charity, 501(c)(3) $1.9 million Lawyers Without Borders IncEIN 06-1574889 · filings North Haven Charity, 501(c)(3) $1.8 million Guardian Ad Litem Services IncEIN 30-0124161 · filings Naugatuck Charity, 501(c)(3) $1.3 million Connecticut Immigrant Center IncEIN 82-2831160 · filings Danbury Charity, 501(c)(3) $308,475 Connecticut Appleseed Center For Law And Justice IncEIN 06-1501061 · filings New Haven Charity, 501(c)(3) — American Immigrant Legal Clinic Project IncEIN 32-0836023 · filings New Haven Charity, 501(c)(3) — First Mile LegalEIN 33-3665877 · filings New Haven Charity, 501(c)(3) — Storrs MagicEIN 42-4510474 · filings West Hartford Charity, 501(c)(3) —
The 17 largest →
Voting and civic participation (14) Organization City Type Revenue Fight Voter Fraud IncEIN 84-1778932 · filings Middletown Advocacy, 501(c)(4) $750,490 Family Institute Of Connecticut IncEIN 06-1282690 · filings Hartford Charity, 501(c)(3) $719,572 League Of Women Voters Of Connecticut Education Fund IncEIN 06-1427498 · filings Hamden Charity, 501(c)(3) $317,557 West Shore Taxpayers Association IncEIN 36-4599868 · filings West Haven Advocacy, 501(c)(4) — Patriots Day InitiativeEIN 41-4590255 · filings Wolcott Charity, 501(c)(3) — Lexi Law Family FoundationEIN 42-4420728 · filings South Windsor Charity, 501(c)(3) — Deep River Taxpayers Association IncEIN 65-1168804 · filings Deep River Advocacy, 501(c)(4) — Political And Civic Involvement Opportunities IncEIN 81-1082353 · filings Stratford Charity, 501(c)(3) — The College Voter IncEIN 85-1543671 · filings Cos Cob Charity, 501(c)(3) — Black Caucus Of Hamden Connecticut IncEIN 86-1239745 · filings Hamden Charity, 501(c)(3) — Willington Veterans Memorial FoundationEIN 88-2937890 · filings Willington Charity, 501(c)(3) — Ypo Democracy GroupEIN 93-2429755 · filings Wallingford Charity, 501(c)(3) —
The 14 largest →
Community health and reproductive care (29) Organization City Type Revenue Community Health Center IncorporatedEIN 06-0897105 · filings Middletown Charity, 501(c)(3) $181.2 million Cornell Scott Hill Health CorporationEIN 06-0870990 · filings New Haven Charity, 501(c)(3) $114.5 million Riverbend Medical Group IncEIN 81-1807730 · filings Hartford Charity, 501(c)(3) $89.2 million Fair Haven Community Health Clinic IncEIN 06-0883545 · filings New Haven Charity, 501(c)(3) $77.9 million Planned Parenthood Of Southern New England IncEIN 06-0263565 · filings New Haven Charity, 501(c)(3) $50.5 million Mhs Primary Care IncEIN 06-1472743 · filings Middletown Charity, 501(c)(3) $45.2 million Staywell Health Care IncEIN 22-3160873 · filings Waterbury Charity, 501(c)(3) $36.0 million Charter Oak Health Center IncEIN 06-0986747 · filings Hartford Charity, 501(c)(3) $22.6 million First Choice Health Centers IncEIN 06-1416492 · filings East Hartford Charity, 501(c)(3) $22.5 million Norwalk Community Health Center IncEIN 06-1436620 · filings Norwalk Charity, 501(c)(3) $15.0 million Community Health And Wellness Center Of Greater Torrington IncEIN 56-2286940 · filings Torrington Charity, 501(c)(3) $11.9 million Malta House Of Care IncEIN 20-3562424 · filings Hartford Charity, 501(c)(3) $3.4 million
The 29 largest →
LGBTQ+ services and rights (21) Organization City Type Revenue Bridgeport Pride Center IncEIN 99-1151095 · filings Bridgeport Charity, 501(c)(3) $406,552 Claro IncEIN 41-2219393 · filings Hartford Charity, 501(c)(3) $4,061 Yale Gay And Lesbian Alumniae Association IncEIN 13-3435862 · filings New Haven Charity, 501(c)(3) — Connecticut Stonewall Foundation IncEIN 22-2784840 · filings West Hartford Charity, 501(c)(3) — Ridgefield Ct Pride IncEIN 33-2119760 · filings Ridgefield Charity, 501(c)(3) — Darien Pride IncEIN 33-3727350 · filings Darien Charity, 501(c)(3) — Primetimers Connecticut IncEIN 39-2267489 · filings Manchester Charity, 501(c)(3) — Equality Connecticut IncEIN 39-4826481 · filings Waterbury Charity, 501(c)(3) — Building The RainbowEIN 41-3579131 · filings Danbury Charity, 501(c)(3) — Fairfield County Lgbtq Youth Allian CeEIN 42-3997346 · filings Easton Charity, 501(c)(3) — Outbox Education IncEIN 85-1161640 · filings Greenwich Charity, 501(c)(3) — West Hartford Pride IncEIN 86-3010559 · filings West Hartford Charity, 501(c)(3) —
The 21 largest →
Criminal justice reform and reentry (29) Organization City Type Revenue Project Model Offender Reintegration Experience IncEIN 06-0957736 · filings New Haven Charity, 501(c)(3) $8.4 million Emerge Connecticut IncEIN 45-3789523 · filings New Haven Charity, 501(c)(3) $1.8 million Mothers United Against Violence IncEIN 41-2262294 · filings Hartford Charity, 501(c)(3) $702,453 Neighbor Fund IncEIN 82-2562281 · filings Pomfret Ctr Charity, 501(c)(3) $303,950 Clicc IncEIN 84-4647186 · filings New Haven Charity, 501(c)(3) $176,924 East Rock Institute IncEIN 22-2804870 · filings Hamden Charity, 501(c)(3) $106,355 New Britain Racial Justice Coalition IncEIN 85-1852702 · filings New Britain Advocacy, 501(c)(4) $40,442 Robin Dancy Center For Healing And HopeEIN 99-0866433 · filings Norwalk Charity, 501(c)(3) $19,600 Waterford Rise IncEIN 88-3628260 · filings Waterford Charity, 501(c)(3) $2,940 Resources Outreach CenterEIN 01-0875312 · filings New Haven Charity, 501(c)(3) — Speak Out Against Racism IncEIN 06-1408632 · filings New Haven Charity, 501(c)(3) — Teachers Against Prejudice IncEIN 06-1608565 · filings Wallingford Charity, 501(c)(3) —
The 29 largest →
Matched by IRS activity code and listed by the revenue on the organization's latest return. Inclusion is not an endorsement; check an organization's own site and filings before you give. Gifts to 501(c)(4) and 501(c)(5) organizations are not tax-deductible.
Source: IRS Exempt Organizations Business Master File . Updated Nov 9, 2026.