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 Federation of Professional & Technical Engineers

    EIN 274110837 · Headquarters: Newtown, CT, US · Employment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  2. International Film Association of Connecticut Inc

    EIN 393387094 · Headquarters: North Haven, CT, US · Arts, Culture & Humanities · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  3. International Hartford Ltd

    EIN 462323260 · Headquarters: HARTFORD, CT, USA · Employment · Latest available filing year: 2024 · Primary form: IRS Form 990

  4. International Hildreth Meiere Association Inc

    EIN 134286369 · Headquarters: Stamford, CT, USA · Education · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  5. International Hope for Refugees and Immigrants Inc

    EIN 921096340 · Headquarters: New Haven, CT, US · Human Services · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  6. International Institute for Injury Prevention Inc

    EIN 753191056 · Headquarters: Redding, CT, US · Diseases, Disorders & Medical Disciplines · Latest available filing year: 2008 · Primary form: IRS Form 990-N

  7. International Institute of Business Analysis Hartord Ct Chapter

    EIN 204639151 · Headquarters: West Hartford, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  8. International Ivf Alliance Inc

    EIN 334215941 · Headquarters: Woodbridge, CT, US · Education · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  9. International Knee Dislocation Study Group Inc

    EIN 394768133 · Headquarters: GUILFORD, CT, US · Education · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  10. International League of Muslim Women-new England Chapter

    EIN 475472573 · Headquarters: Bloomfield, CT, US · Human Services · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  11. International Maintenance Institute Inc

    EIN 066068621 · Headquarters: Wallingford, CT, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  12. International Maintenance Institute Inc

    EIN 742516913 · Headquarters: Vernon, CT, US · Arts, Culture & Humanities · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  13. International Mandela Effect Conference Inc

    EIN 850884013 · Headquarters: Branford, CT, US · Social Science · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  14. International Masons

    EIN 237532356 · Headquarters: West Haven, CT, US · Mutual & Membership Benefit · Latest available filing year: 2011 · Primary form: IRS Form 990-N

  15. International Masons

    EIN 237532367 · Headquarters: Northford, CT, US · Mutual & Membership Benefit · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  16. International Medical Crisis Response Alliance Inc

    EIN 611668609 · Headquarters: Norwalk, CT, US · International, Foreign Affairs & National Security · Latest available filing year: 2017 · Primary form: IRS Form 990-N

  17. International Melges 24 Class Association Inc

    EIN 845174317 · Headquarters: Rocky Hill, CT, USA · Mutual & Membership Benefit · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  18. International Museum Theatre Alliance Inc

    EIN 043233931 · Headquarters: Woodbridge, CT, US · Arts, Culture & Humanities · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  19. International Order of the Kings Daughters and Sons Hd Un of Circles

    EIN 060647274 · Headquarters: EAST HARTFORD, CT, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-PF

  20. International Order of the Rainbow Girls

    EIN 061541020 · Headquarters: Hamden, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  21. International Order of the Rainbow Girls

    EIN 066049093 · Headquarters: Hamden, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  22. International Order of the Rainbow Girls

    EIN 066056702 · Headquarters: Hamden, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  23. International Order of the Rainbow Girls

    EIN 237141150 · Headquarters: Hamden, CT, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  24. International Order of the Rainbow Girls

    EIN 237141156 · Headquarters: Hamden, CT, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  25. International Order of the Rainbow Girls

    EIN 237141184 · Headquarters: Hamden, CT, US · Youth Development · Latest available filing year: 2011 · Primary form: IRS Form 990-N

  26. International Order of the Rainbow Girls

    EIN 237141191 · Headquarters: Hamden, CT, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  27. International Order of the Rainbow Girls

    EIN 237141192 · Headquarters: Hamden, CT, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  28. International Order of the Rainbow Girls

    EIN 237143852 · Headquarters: Hamden, CT, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  29. International Order of the Rainbow Girls

    EIN 237144886 · Headquarters: Hamden, CT, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  30. International Order of the Rainbow Girls

    EIN 237144890 · Headquarters: Hamden, CT, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  31. International Order of the Rainbow Girls

    EIN 352243494 · Headquarters: Hamden, CT, US · Unknown & Unclassified · Latest available filing year: 2021 · Primary form: IRS Form 990-N

  32. International Order of the Rainbow Girls

    EIN 911901105 · Headquarters: Hamden, CT, US · Youth Development · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  33. International Parcel Tankers Assoc Inc C/o Blt Chembulk the Delamar

    EIN 061246250 · Headquarters: SOUTHPORT, CT, USA · International, Foreign Affairs & National Security · Latest available filing year: 2018 · Primary form: IRS Form 990

  34. International Penguin & Marine Mammal Foundation Inc

    EIN 455430679 · Headquarters: Mystic, CT, US · Science & Technology · Latest available filing year: 2015 · Primary form: IRS Form 990-N

  35. International Photographic Council

    EIN 133010330 · Headquarters: RIDGEFIELD, CT, USA · Arts, Culture & Humanities · Latest available filing year: 2024 · Primary form: IRS Form 990

  36. International Plant Propagators Society

    EIN 237000439 · Headquarters: Monroe, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  37. International Police Association United States Section

    EIN 061462082 · Headquarters: East Lyme, CT, US · Crime & Legal Related · Latest available filing year: 2014 · Primary form: IRS Form 990-N

  38. International Political Economy Society

    EIN 263991417 · Headquarters: New Haven, CT, US · Social Science · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  39. International Project for Jamaica Inc

    EIN 450536941 · Headquarters: Hartford, CT, US · Public & Societal Benefit · Latest available filing year: 2007 · Primary form: IRS Form 990-N

  40. International Reading Association Inc

    EIN 061013325 · Headquarters: Woodbury, CT, US · Education · Latest available filing year: 2017 · Primary form: IRS Form 990-N

  41. International Reading Association Inc

    EIN 061239866 · Headquarters: Stonington, CT, US · Education · Latest available filing year: 2011 · Primary form: IRS Form 990-N

  42. International Reading Association Inc

    EIN 066077810 · Headquarters: VERNON ROCKVILLE, CT, US · Education · Latest available filing year: 2017 · Primary form: IRS Form 990-N

  43. International Reading Association Inc

    EIN 237175948 · Headquarters: Danielson, CT, US · Education · Latest available filing year: 2012 · Primary form: IRS Form 990-N

  44. International Reading Association Inc

    EIN 510151387 · Headquarters: New Fairfield, CT, US · Education · Latest available filing year: 2017 · Primary form: IRS Form 990-N

  45. International Reading Associaton Inc

    EIN 066077809 · Headquarters: Danbury, CT, US · Recreation & Sports · Latest available filing year: 2017 · Primary form: IRS Form 990-N

  46. International Research Foundation for Energy Medicine

    EIN 431412045 · Headquarters: Wallingford, CT, US · Health Care · Latest available filing year: 2018 · Primary form: IRS Form 990-N

  47. International Roller Sports Association Inc

    EIN 800639048 · Headquarters: Groton, CT, US · Recreation & Sports · Latest available filing year: 2019 · Primary form: IRS Form 990-N

  48. International School at Dundee PTA

    EIN 421682765 · Headquarters: Riverside, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  49. International Society for Ayurveda and Health Isah

    EIN 161682861 · Headquarters: west hartford, CT, US · Health Care · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  50. International Society for Clinical Densitometry Inc

    EIN 161474752 · Headquarters: Middletown, CT, USA · Science & Technology · Latest available filing year: 2025 · Primary form: IRS Form 990

  51. International Society for Evolution Medicine&public Health C/o P Turner

    EIN 455104735 · Headquarters: NEW HAVEN, CT, USA · Medical Research · Latest available filing year: 2024 · Primary form: IRS Form 990-PF

  52. International Society for Interpersonal Acceptance and Reject

    EIN 208388398 · Headquarters: Storrs, CT, US · Civil Rights, Social Action & Advocacy · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  53. International Society for Islamic Legal Studies

    EIN 202610323 · Headquarters: New Haven, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  54. International Society for the Study of Trophoblastic Disease Inc

    EIN 061588394 · Headquarters: Orange, CT, US · Diseases, Disorders & Medical Disciplines · Latest available filing year: 2007 · Primary form: IRS Form 990-N

  55. International Society of Automation

    EIN 066101679 · Headquarters: Wallingford, CT, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  56. International Society of Blood Purification Inc

    EIN 050495828 · Headquarters: Plainville, CT, US · Diseases, Disorders & Medical Disciplines · Latest available filing year: 2013 · Primary form: IRS Form 990-N

  57. International Society of Certified Employee Benefit Specialists Inc

    EIN 061194703 · Headquarters: Monroe, CT, US · Mutual & Membership Benefit · Latest available filing year: 2014 · Primary form: IRS Form 990-N

  58. International Society of Ecological Psychology Inc

    EIN 061053858 · Headquarters: Hartford, CT, US · Education · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  59. International Society Of Glass Beadmakers

    EIN 341948487 · Headquarters: Avon, CT, USA · Arts, Culture & Humanities · Latest available filing year: 2025 · Primary form: IRS Form 990

  60. International Student Aid Association Inc

    EIN 851022822 · Headquarters: NORWALK, CT, USA · Human Services · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  61. International Students USA Incorporated

    EIN 223159951 · Headquarters: Hamden, CT, USA · Education · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  62. International Studies Association Inc

    EIN 870485763 · Headquarters: STORRS, CT, USA · Social Science · Latest available filing year: 2024 · Primary form: IRS Form 990

  63. International Tabernacle of Prayer

    EIN 264635989 · Headquarters: Hartford, CT, US · Religion Related · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  64. International Taekwon-do Federation-USA Inc

    EIN 455062804 · Headquarters: Manchester, CT, US · Recreation & Sports · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  65. International Trauma Center Inc

    EIN 061469247 · Headquarters: New Haven, CT, US · Diseases, Disorders & Medical Disciplines · Latest available filing year: 2015 · Primary form: IRS Form 990-N

  66. International Tuba Euphonium Association

    EIN 510161752 · Headquarters: NEW LONDON, CT, USA · Arts, Culture & Humanities · Latest available filing year: 2024 · Primary form: IRS Form 990

  67. International Union of Bricklayers & Allied Craftworkers Local 1

    EIN 061478610 · Headquarters: WALLINGFORD, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  68. International Union of Elevators Loc 91

    EIN 060401156 · Headquarters: EAST HARTFORD, CT, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  69. International Union of Journeymen & Allied Trades

    EIN 710301129 · Headquarters: DANBURY, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  70. International Union of Journeymen & Allied Trades

    EIN 823161647 · Headquarters: DANBURY, CT, USA · Unknown & Unclassified · Latest available filing year: 2021 · Primary form: IRS Form 990-EZ

  71. International Union of Operating

    EIN 060841198 · Headquarters: HAMDEN, CT, USA · Employment · Latest available filing year: 2009 · Primary form: IRS Form 990

  72. International Union of Operating Engineers Local 478 Education Trust Inc

    EIN 043611870 · Headquarters: HAMDEN, CT, USA · Education · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  73. International Union of Operating Engineers Local Union 478

    EIN 060401158 · Headquarters: HAMDEN, CT, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  74. International Union of Operating Engineers Welfare Fund 478

    EIN 060662089 · Headquarters: HAMDEN, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  75. International Union of Painters & Allied Trades District Council 11

    EIN 061269651 · Headquarters: MIDDLETOWN, CT, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  76. International Union of Painters & Allied Trades Local 186

    EIN 060400771 · Headquarters: MIDDLETOWN, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  77. International Union of Painters & Allied Trades Local Union 1274

    EIN 060602657 · Headquarters: MIDDLETOWN, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  78. International Union of Painters and Allied Trades Local 1333

    EIN 050275268 · Headquarters: MIDDLETOWN, CT, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  79. International Union of Painters and Allied Trades Local No 195

    EIN 050195125 · Headquarters: MIDDLETOWN, CT, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  80. International Union of Painters and Allied Trades Local Union 1719

    EIN 061064405 · Headquarters: MIDDLETOWN, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  81. International Union UAW LOCAL 2121

    EIN 010959193 · Headquarters: Gales Ferry, CT, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  82. International Union UAW Local 2377

    EIN 061508904 · Headquarters: Stamford, CT, USA · Employment · Latest available filing year: 2025 · Primary form: IRS Form 990

  83. International Union UAW Local 405

    EIN 060572572 · Headquarters: West Hartford, CT, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  84. International Union Uaw Local 571 Local Union 571 Uaw

    EIN 060790824 · Headquarters: GROTON, CT, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  85. International Union UAW LOCAL 6950

    EIN 474526742 · Headquarters: Storrs, CT, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  86. International Union United Auto Aerospace & Agricultural Workers

    EIN 042461404 · Headquarters: Hartford, CT, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  87. International Union United Auto Aerospace & Agricultural Workers

    EIN 060605429 · Headquarters: East Hartford, CT, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  88. International Union United Auto Aerospace & Agricultural Workers

    EIN 060632653 · Headquarters: EAST HARTFORD, CT, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  89. International Union United Auto Aerospace & Agricultural Workers

    EIN 060755920 · Headquarters: Torrington, CT, US · Employment · Latest available filing year: 2013 · Primary form: IRS Form 990-N

  90. International Union United Auto Aerospace & Agricultural Workers

    EIN 061294206 · Headquarters: Hartford, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  91. International Union United Auto Aerospace & Agricultural Workers

    EIN 061295954 · Headquarters: Hartford, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  92. International Union United Auto Aerospace & Agricultural Workers

    EIN 061374307 · Headquarters: Hartford, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  93. International Union United Auto Aerospace & Agricultural Workers

    EIN 061374309 · Headquarters: Hartford, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  94. International Union United Auto Aerospace & Agricultural Workers

    EIN 146049340 · Headquarters: EAST HARTFORD, CT, US · Unknown & Unclassified · Latest available filing year: 2021 · Primary form: IRS Form 990-N

  95. International Union United Auto Aerospace & Agricultural Workers

    EIN 237017659 · Headquarters: Hartford, CT, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  96. International Union United Auto Aerospace Workers of America

    EIN 061264556 · Headquarters: Hartford, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  97. International Utilities Revenue Protection Association

    EIN 311388229 · Headquarters: SEYMOUR, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  98. International Women and Childrens Burn Foundation

    EIN 263212835 · Headquarters: Torrington, CT, US · Health Care · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  99. International Womens Forum Connecticut Inc

    EIN 205273353 · Headquarters: Branford, CT, US · Community Improvement & Capacity Building · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  100. International Womens Insolvency & Restructuring Confederation Inc

    EIN 161674502 · Headquarters: Hartford, CT, US · Unknown & Unclassified · Latest available filing year: 2019 · Primary form: IRS Form 990-N

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