Nonprofits in Connecticut

Nonprofits in Connecticut. Browse 26,993 public nonprofit profiles. Review organization identities, available filing years, and their complete CharitySense profiles.

Location refers to headquarters recorded in public sources, not an organization’s service area. Classification describes its reported category and does not assess its effectiveness.

Nonprofit profiles

  1. International Association of Lions Clubs

    EIN 222844121 · Headquarters: Uncasville, CT, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  2. International Association of Lions Clubs

    EIN 223075813 · Headquarters: East Hartland, CT, US · Community Improvement & Capacity Building · Latest available filing year: 2011 · Primary form: IRS Form 990-N

  3. International Association of Lions Clubs

    EIN 223085747 · Headquarters: Canterbury, CT, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  4. International Association of Lions Clubs

    EIN 237047265 · Headquarters: FRANKLIN, CT, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  5. International Association of Lions Clubs

    EIN 237047266 · Headquarters: North Haven, CT, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  6. International Association of Lions Clubs

    EIN 237247470 · Headquarters: Niantic, CT, US · Unknown & Unclassified · Latest available filing year: 2021 · Primary form: IRS Form 990-N

  7. International Association of Lions Clubs

    EIN 237307146 · Headquarters: Salem, CT, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  8. International Association of Lions Clubs

    EIN 237311055 · Headquarters: Marlborough, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  9. International Association of Lions Clubs

    EIN 237317155 · Headquarters: HARWINTON, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  10. International Association of Lions Clubs

    EIN 237386655 · Headquarters: POMFRET CTR, CT, US · Community Improvement & Capacity Building · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  11. International Association of Lions Clubs

    EIN 237405056 · Headquarters: Manchester, CT, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  12. International Association of Lions Clubs

    EIN 237408570 · Headquarters: Derby, CT, US · Community Improvement & Capacity Building · Latest available filing year: 2011 · Primary form: IRS Form 990-N

  13. International Association of Lions Clubs

    EIN 260414735 · Headquarters: Milford, CT, US · Community Improvement & Capacity Building · Latest available filing year: 2017 · Primary form: IRS Form 990-N

  14. International Association of Lions Clubs

    EIN 263394947 · Headquarters: Ledyard, CT, US · Community Improvement & Capacity Building · Latest available filing year: 2017 · Primary form: IRS Form 990-N

  15. International Association of Lions Clubs

    EIN 263844720 · Headquarters: WALLINGFORD, CT, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  16. International Association of Lions Clubs

    EIN 270077719 · Headquarters: EAST HAVEN, CT, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  17. International Association of Lions Clubs

    EIN 320589767 · Headquarters: Glastonbury, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  18. International Association of Lions Clubs

    EIN 510198532 · Headquarters: Bolton, CT, US · Unknown & Unclassified · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  19. International Association of Lions Clubs

    EIN 510230178 · Headquarters: KEnT, CT, US · Community Improvement & Capacity Building · Latest available filing year: 2011 · Primary form: IRS Form 990-N

  20. International Association of Lions Clubs

    EIN 510508079 · Headquarters: Westbrook, CT, US · Community Improvement & Capacity Building · Latest available filing year: 2012 · Primary form: IRS Form 990-N

  21. International Association of Lions Clubs

    EIN 521920384 · Headquarters: Westport, CT, US · Community Improvement & Capacity Building · Latest available filing year: 2011 · Primary form: IRS Form 990-N

  22. International Association of Lions Clubs

    EIN 812903787 · Headquarters: Ellington, CT, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  23. International Association of Lions Clubs

    EIN 814420590 · Headquarters: Plainville, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  24. International Association of Lions Clubs

    EIN 815058004 · Headquarters: Lisbon, CT, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  25. International Association of Lions Clubs

    EIN 825431778 · Headquarters: Vernon, CT, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  26. International Association of Lions Clubs

    EIN 843906680 · Headquarters: West Hartford, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  27. International Association of Lions Clubs

    EIN 844388036 · Headquarters: Cromwell, CT, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  28. International Association of Lions Clubs - 9060 Clinton

    EIN 066071607 · Headquarters: Clinton, CT, US · Human Services · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  29. INTERNATIONAL ASSOCIATION OF LIONS CLUBS - Watertown Lions

    EIN 061156034 · Headquarters: Watertown, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  30. International Association of Lions Clubs Putnam Lions Club Inc

    EIN 061057279 · Headquarters: PUTNAM, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  31. International Association of Machinists & Aerospace Local 1746

    EIN 060613269 · Headquarters: EAST HARTFORD, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  32. International Association of Machinists & Aerospace Workers

    EIN 020599079 · Headquarters: New London, CT, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  33. International Association of Machinists & Aerospace Workers

    EIN 050391448 · Headquarters: New London, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  34. International Association of Machinists & Aerospace Workers

    EIN 050479166 · Headquarters: New London, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  35. International Association of Machinists & Aerospace Workers

    EIN 060381384 · Headquarters: New London, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  36. International Association of Machinists & Aerospace Workers

    EIN 060400748 · Headquarters: East Hartford, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  37. International Association of Machinists & Aerospace Workers

    EIN 060607923 · Headquarters: Kensington, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  38. International Association of Machinists & Aerospace Workers

    EIN 060636091 · Headquarters: Kensington, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  39. International Association of Machinists & Aerospace Workers

    EIN 060666131 · Headquarters: WINDSOR LOCKS, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  40. International Association of Machinists & Aerospace Workers

    EIN 060722470 · Headquarters: Kensington, CT, US · Employment · Latest available filing year: 2013 · Primary form: IRS Form 990-N

  41. International Association of Machinists & Aerospace Workers

    EIN 060730587 · Headquarters: New London, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  42. International Association of Machinists & Aerospace Workers

    EIN 060907646 · Headquarters: Kensington, CT, US · Employment · Latest available filing year: 2013 · Primary form: IRS Form 990-N

  43. International Association of Machinists & Aerospace Workers

    EIN 066069264 · Headquarters: North Haven, CT, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  44. International Association of Machinists & Aerospace Workers

    EIN 066069650 · Headquarters: Bethel, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  45. International Association of Machinists & Aerospace Workers

    EIN 331195137 · Headquarters: Milldale, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  46. International Association of Machinists & Aerospace Workers

    EIN 510621609 · Headquarters: Kensington, CT, US · Employment · Latest available filing year: 2013 · Primary form: IRS Form 990-N

  47. International Association of Machinists & Aerospace Workers Local 1746 Building

    EIN 060731800 · Headquarters: EAST HARTFORD, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  48. International Association of Machinists & Aerospace Workers Local 700

    EIN 060756083 · Headquarters: HIGGANUM, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  49. International Association of Machinists and Aerospace Workers Cscm

    EIN 060851542 · Headquarters: EAST HARTFORD, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  50. International Association of New Haven Inc

    EIN 060694174 · Headquarters: NEW HAVEN, CT, USA · Human Services · Latest available filing year: 2024 · Primary form: IRS Form 990-PF

  51. International Association of Sheet Metal Air Rail & Transportation

    EIN 061564035 · Headquarters: BRANFORD, CT, US · Employment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  52. International Association of Sheet Metal Air Rail & Transportation

    EIN 066002555 · Headquarters: Naugatuck, CT, US · Employment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  53. International Association of Sheet Metal Air Rail & Transportation

    EIN 066068793 · Headquarters: Wallingford, CT, US · Employment · Latest available filing year: 2021 · Primary form: IRS Form 990-N

  54. International Association of Sheet Metal Air Rail & Transportation

    EIN 066090425 · Headquarters: WATERFORD, CT, US · Employment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  55. International Association of Sheet Metal Air Rail & Transportation

    EIN 222671719 · Headquarters: Hamden, CT, US · Employment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  56. International Association of Sport and Play for Young Children

    EIN 822626621 · Headquarters: Hamden, CT, US · Environment · Latest available filing year: 2019 · Primary form: IRS Form 990-N

  57. International Association of Theatrical and Stage Employees Local 74

    EIN 066070010 · Headquarters: NEW HAVEN, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  58. International Bishops Conference USA Inc

    EIN 432105475 · Headquarters: BLOOMFIELD, CT, US · Religion Related · Latest available filing year: 2019 · Primary form: IRS Form 990-N

  59. International Brotherhd - Boilrmkrs Ir Shp Bldrs Blcksmth Frgrs & Hlpr

    EIN 060727380 · Headquarters: SALEM, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  60. International Brotherhood L1040

    EIN 060669593 · Headquarters: NEWINGTON, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  61. International Brotherhood of Boilermakers # 614

    EIN 060728257 · Headquarters: GROTON, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  62. International Brotherhood of Electrical Workers

    EIN 066064824 · Headquarters: DANBURY, CT, US · Unknown & Unclassified · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  63. International Brotherhood of Electrical Workers

    EIN 136007364 · Headquarters: Stamford, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  64. International Brotherhood of Electrical Workers - 0261 Local

    EIN 060729150 · Headquarters: GROTON, CT, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  65. International Brotherhood of Electrical Workers - Local 1573

    EIN 133090174 · Headquarters: Darrien, CT, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  66. International Brotherhood of Electrical Workers Local 420

    EIN 060716467 · Headquarters: WATERBURY, CT, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  67. International Brotherhood of Electrical Workers Local 488 Charity Fund Inc

    EIN 881093874 · Headquarters: MONROE, CT, USA · Recreation & Sports · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  68. International Brotherhood of Electrical Workers Local No 90

    EIN 060400792 · Headquarters: WALLINGFORD, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  69. International Brotherhood of Electrical Workers Local Union No 457

    EIN 060892100 · Headquarters: BERLIN, CT, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  70. International Brotherhood of Electrical Workers Local Union No35 Association Inc

    EIN 060865102 · Headquarters: HARTFORD, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  71. International Brotherhood of Electrical Workers Union Local Union No 35

    EIN 060400787 · Headquarters: HARTFORD, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  72. International Brotherhood of Painters & Allied Trades Local 1122

    EIN 060693728 · Headquarters: NEW LONDON, CT, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  73. International Brotherhood of Police Officers Local 357

    EIN 061625610 · Headquarters: CROMWELL, CT, US · Employment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  74. International Brotherhood of Police Officers Local 458

    EIN 222886327 · Headquarters: Simsbury, CT, US · Employment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  75. International Brotherhood of Teamster Lcl 677 Brotherhood Fund

    EIN 223967862 · Headquarters: WATERBURY, CT, US · Education · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  76. International Brotherhood of Teamsters

    EIN 061157206 · Headquarters: STRATFORD, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  77. International Brotherhood of Teamsters

    EIN 061180033 · Headquarters: WATERBURY, CT, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  78. International Brotherhood of Teamsters Local 191

    EIN 060453477 · Headquarters: BRIDGEPORT, CT, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  79. International Brotherhood of Teamsters Local 559

    EIN 060251543 · Headquarters: BLOOMFIELD, CT, USA · Employment · Latest available filing year: 2019 · Primary form: IRS Form 990

  80. International Brotherhood of Teamsters Local Union 443

    EIN 060400785 · Headquarters: NEW HAVEN, CT, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  81. International Brotherhood of Teamsters Local Union 677

    EIN 060389865 · Headquarters: CHESHIRE, CT, USA · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990

  82. International Buddhist Zen Do

    EIN 061456066 · Headquarters: New Hartford, CT, USA · Religion Related · Latest available filing year: 2018 · Primary form: IRS Form 990-EZ

  83. International Camel Rescue Inc

    EIN 474827695 · Headquarters: Ridgefield, CT, US · Animal Related · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  84. International Catholic Deaf Assn

    EIN 061014547 · Headquarters: Jewett City, CT, US · Human Services · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  85. International Catholic Deaf Assn

    EIN 066107621 · Headquarters: New Britain, CT, US · Human Services · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  86. International Catholic Missions Relief Fund Inc

    EIN 043437948 · Headquarters: Somers, CT, US · Human Services · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  87. International Center for Health

    EIN 061339428 · Headquarters: EAST GRANBY, CT, USA · International, Foreign Affairs & National Security · Latest available filing year: 2012 · Primary form: IRS Form 990

  88. International Chemical Workers Union Council Ufcw

    EIN 300759835 · Headquarters: New Haven, CT, US · Employment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  89. International College of Cultural Psychiatry Inc

    EIN 833205005 · Headquarters: Cheshire, CT, USA · Mental Health & Crisis Intervention · Latest available filing year: 2024 · Primary form: IRS Form 990-PF

  90. International Concert Alliance Inc

    EIN 134048030 · Headquarters: Stamford, CT, US · Arts, Culture & Humanities · Latest available filing year: 2007 · Primary form: IRS Form 990-N

  91. International Concussion Society

    EIN 822955479 · Headquarters: WESTPORT, CT, USA · Diseases, Disorders & Medical Disciplines · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  92. International Council for Middle East Studies

    EIN 270554971 · Headquarters: NEW BRITAIN, CT, US · Religion Related · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  93. International Cultural Foundation

    EIN 237347287 · Headquarters: BRIDGEPORT, CT, US · International, Foreign Affairs & National Security · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  94. International Cure Ct Inc

    EIN 850675883 · Headquarters: New Haven, CT, US · Human Services · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  95. International Dyslexia Association of Connecticut Inc

    EIN 334065585 · Headquarters: Ridgefield, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  96. International Executive Housekeepers Association of Americ

    EIN 046171547 · Headquarters: Hartford, CT, US · Human Services · Latest available filing year: 2012 · Primary form: IRS Form 990-N

  97. International Executive Resources Group Inc

    EIN 141881011 · Headquarters: EAST HARTFORD, CT, USA · International, Foreign Affairs & National Security · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  98. International Family Life Enrichment Center

    EIN 461453323 · Headquarters: NEW LONDON, CT, US · Human Services · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  99. International Fastener Machinery Association Inc

    EIN 061387535 · Headquarters: DANBURY, CT, USA · Community Improvement & Capacity Building · Latest available filing year: 2020 · Primary form: IRS Form 990-EZ

  100. International Federation of Professional & Technical Engineers

    EIN 237055400 · Headquarters: Stratford, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

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