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 Yan Xin Qigong Association

    EIN 371284597 · Headquarters: MARLBOROUGH, CT, US · Science & Technology · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  2. International Youth Sports Alliance

    EIN 262727767 · Headquarters: Rocky Hill, CT, US · Recreation & Sports · Latest available filing year: 2018 · Primary form: IRS Form 990-N

  3. Internationl Association of Lions Clubs

    EIN 061419705 · Headquarters: BETHANY, CT, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  4. Internhere Com Inc

    EIN 383801020 · Headquarters: West Hartford, CT, US · Education · Latest available filing year: 2014 · Primary form: IRS Form 990-N

  5. Interqual Research and Training Institute

    EIN 931971269 · Headquarters: Hamden, CT, US · Human Services · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  6. Interrelations Collaborative Inc

    EIN 061621916 · Headquarters: Hamden, CT, US · Recreation & Sports · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  7. Interreligious Eco-justice Network

    EIN 043737215 · Headquarters: Preston, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  8. Intl Assn of Eating Disorder Prof New Haven Hartford Chapter

    EIN 834632734 · Headquarters: Newtown, CT, US · Mental Health & Crisis Intervention · Latest available filing year: 2021 · Primary form: IRS Form 990-N

  9. Intl Assoc of Fire Fighters Local 1073

    EIN 066084746 · Headquarters: Middletown, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  10. Intl Assoc of Firefighters Local 1739 Ridgefield

    EIN 222994154 · Headquarters: RIDGEFIELD, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  11. Intl Assoc of Firefighters Local Meriden Firefighters Local 1148

    EIN 066045610 · Headquarters: MERIDEN, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  12. Intl Assoc of Sheet Metal Air Rail & Transportation 679 Td

    EIN 066002254 · Headquarters: POMFRET CTR, CT, US · Employment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  13. Intl Brotherhood of Electrical Workers Local 42 Charity Fund Inc

    EIN 881212547 · Headquarters: EAST WINDSOR, CT, USA · Human Services · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  14. Intl Brotherhood of Teamsters Local Union 145

    EIN 060610540 · Headquarters: BRIDGEPORT, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  15. Intl Museum of Cartoon Art Inc

    EIN 650230316 · Headquarters: STAMFORD, CT, USA · Arts, Culture & Humanities · Latest available filing year: 2009 · Primary form: IRS Form 990-EZ

  16. Invenium Inc

    EIN 472995962 · Headquarters: Litchfield, CT, US · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2018 · Primary form: IRS Form 990-N

  17. Invent the Summer Inc

    EIN 844059423 · Headquarters: Farmington, CT, USA · Youth Development · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  18. Invest Diva Private Foundation

    EIN 873816707 · Headquarters: Westport, CT, USA · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2025 · Primary form: IRS Form 990-PF

  19. Inyahead Academy Inc

    EIN 334693748 · Headquarters: Hartford, CT, US · Youth Development · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  20. Inyana-league for Rwandan Children and Youth

    EIN 912153668 · Headquarters: ROCKY HILL, CT, US · International, Foreign Affairs & National Security · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  21. Ion Bank Foundation Inc

    EIN 061513293 · Headquarters: NAUGATUCK, CT, USA · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2025 · Primary form: IRS Form 990-PF

  22. Ionic Chapter Order of Demolay

    EIN 264723228 · Headquarters: North Windham, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  23. Iota Chi Sigma Foundation

    EIN 814468228 · Headquarters: Bridgeport, CT, US · Community Improvement & Capacity Building · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  24. Iota Mu Chapter of Chi Omega Fraternity

    EIN 463822652 · Headquarters: HAMDEN, CT, USA · Education · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  25. Iota Mu House Corporation of Chi Omega Fraternity

    EIN 464556267 · Headquarters: Hamden, CT, US · Education · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  26. Iota Phi Lambda Sorority Inc

    EIN 237382807 · Headquarters: Hartford, CT, US · Education · Latest available filing year: 2008 · Primary form: IRS Form 990-N

  27. Iota Tau Chapter of Delta Tau Delta International Fraternity

    EIN 461956197 · Headquarters: Fairfield, CT, US · Education · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  28. Iota Upsilon Chapter 234 Sigma Theta Tao

    EIN 311242954 · Headquarters: WEST HARTFORD, CT, US · Education · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  29. Iowa Frg

    EIN 851222273 · Headquarters: Groton, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  30. Ip Factory Inc

    EIN 453356769 · Headquarters: East Hartford, CT, US · Community Improvement & Capacity Building · Latest available filing year: 2018 · Primary form: IRS Form 990-N

  31. IQuilt Partnership Inc

    EIN 451744906 · Headquarters: Hartford, CT, USA · Community Improvement & Capacity Building · Latest available filing year: 2024 · Primary form: IRS Form 990

  32. Ir2l Inc

    EIN 474012707 · Headquarters: Fairfield, CT, US · Human Services · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  33. Ira Block Foundation Inc

    EIN 223770758 · Headquarters: WEST MYSTIC, CT, USA · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2024 · Primary form: IRS Form 990-PF

  34. Iran Human Rights Documentation Center Inc

    EIN 202744292 · Headquarters: NEW HAVEN, CT, USA · International, Foreign Affairs & National Security · Latest available filing year: 2024 · Primary form: IRS Form 990

  35. Irelands Great Hunger Museum Inc

    EIN 461158164 · Headquarters: HAMDEN, CT, US · Arts, Culture & Humanities · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  36. Irelands Great Hunger Museum of Fairfield Inc

    EIN 881002726 · Headquarters: Monroe, CT, US · Arts, Culture & Humanities · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  37. Irena Bronstein & Eugene Bonte Charitable Foundation

    EIN 043493350 · Headquarters: Westport, CT, USA · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2023 · Primary form: IRS Form 990-PF

  38. Iri Research Institute Inc

    EIN 131984556 · Headquarters: Stamford, CT, US · International, Foreign Affairs & National Security · Latest available filing year: 2011 · Primary form: IRS Form 990-N

  39. Irish American Community Center Inc

    EIN 061050332 · Headquarters: EAST HAVEN, CT, USA · Arts, Culture & Humanities · Latest available filing year: 2025 · Primary form: IRS Form 990

  40. Irish American Cultural Society of Stamford Saint Patricks Day Parade

    EIN 832831413 · Headquarters: STAMFORD, CT, USA · Arts, Culture & Humanities · Latest available filing year: 2025 · Primary form: IRS Form 990-PF

  41. Irish American Historical Society Inc

    EIN 222932494 · Headquarters: Orange, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  42. Irish American Home Society Inc

    EIN 060633969 · Headquarters: GLASTONBURY, CT, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  43. Irish Club of Willimantic

    EIN 061325574 · Headquarters: Willimantic, CT, US · Unknown & Unclassified · Latest available filing year: 2014 · Primary form: IRS Form 990-N

  44. Irish Cultural and Sports Association of Southern Connecticu

    EIN 453967028 · Headquarters: Hamden, CT, US · Arts, Culture & Humanities · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  45. Irish Heritage Society of Milford Inc

    EIN 562585454 · Headquarters: Milford, CT, USA · Arts, Culture & Humanities · Latest available filing year: 2024 · Primary form: IRS Form 990

  46. Irish History Round Table Inc

    EIN 223191502 · Headquarters: Hamden, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  47. Irish Northern Aid of Connecticut Inc

    EIN 861545236 · Headquarters: Windsor, CT, US · Human Services · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  48. Irish Setter Club of Central Connecticut Inc

    EIN 510141505 · Headquarters: Tariffville, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  49. Iron Law Mc of New Milford Ct Inc

    EIN 831212724 · Headquarters: New Milford, CT, US · Recreation & Sports · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  50. Iron Oar Challenge

    EIN 472137765 · Headquarters: New Haven, CT, US · Public & Societal Benefit · Latest available filing year: 2014 · Primary form: IRS Form 990-N

  51. Iron Sharpens Iron

    EIN 204885548 · Headquarters: West Hartford, CT, United States · Religion Related · Latest available filing year: 2024 · Primary form: IRS Form 990

  52. Iron Sharpens Iron Inc

    EIN 208090711 · Headquarters: WEST HARTFORD, CT, USA · Religion Related · Latest available filing year: 2024 · Primary form: IRS Form 990

  53. Iron Sharpens Iron Mentor Ministries

    EIN 261966470 · Headquarters: West Haven, CT, US · Youth Development · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  54. Iron Workers Local 15 Benefit Club Inc

    EIN 992393885 · Headquarters: HARTFORD, CT, USA · Civil Rights, Social Action & Advocacy · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  55. Iron Workers' Loc 15 & 424 App Tr Fund

    EIN 066087354 · Headquarters: CROMWELL, CT, USA · Education · Latest available filing year: 2024 · Primary form: IRS Form 990

  56. Iron Workers' Locals No 15 & 424 Extended Benefit Fund

    EIN 066078910 · Headquarters: CROMWELL, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  57. Ironman Shamble

    EIN 371695839 · Headquarters: STRATFORD, CT, US · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2014 · Primary form: IRS Form 990-N

  58. Ironoak Foundation Inc

    EIN 823736757 · Headquarters: New Canaan, CT, USA · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2022 · Primary form: IRS Form 990-PF

  59. Ironwood Community Partners Inc

    EIN 471277495 · Headquarters: Bloomfield, CT, USA · Community Improvement & Capacity Building · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  60. Ironworks Foundation Inc

    EIN 333859206 · Headquarters: Bridgeport, CT, US · Youth Development · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  61. Irosa Cares Inc

    EIN 990479630 · Headquarters: Stamford, CT, US · Public & Societal Benefit · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  62. Irving Gilman Family Charitable Foundation

    EIN 066071322 · Headquarters: SOUTH GLASTONBURY, CT, USA · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2019 · Primary form: IRS Form 990-PF

  63. Irving Moorin Charitable Trust

    EIN 237099137 · Headquarters: Fairfield, CT, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  64. Is It Clean

    EIN 923327677 · Headquarters: Falls Village, CT, US · Human Services · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  65. Isaac and Cilly Ziering Foundation

    EIN 133429634 · Headquarters: GREENWICH, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-PF

  66. Isaac Family Foundation Corp

    EIN 843290095 · Headquarters: TOLLAND, CT, USA · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2025 · Primary form: IRS Form 990-PF

  67. Isaac Herman Zacharia Foundation

    EIN 510108212 · Headquarters: WESTPORT, CT, USA · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2021 · Primary form: IRS Form 990-PF

  68. Isaac Pto

    EIN 881435283 · Headquarters: New London, CT, US · Education · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  69. Isabella Nicole Kurek Memorial Foundation Inc

    EIN 461012139 · Headquarters: Norwalk, CT, US · Human Services · Latest available filing year: 2015 · Primary form: IRS Form 990-N

  70. Isaiah 58 Outreach Inc

    EIN 264111492 · Headquarters: East Haddam, CT, US · Human Services · Latest available filing year: 2018 · Primary form: IRS Form 990-N

  71. Isaiah 611 Inc

    EIN 061069280 · Headquarters: BRIDGEPORT, CT, USA · Crime & Legal Related · Latest available filing year: 2018 · Primary form: IRS Form 990

  72. Isaiahs Hope Inc

    EIN 873817121 · Headquarters: Milford, CT, US · Health Care · Latest available filing year: 2021 · Primary form: IRS Form 990-N

  73. Isbp Edu Inc

    EIN 832428741 · Headquarters: PLAINVILE, CT, US · Education · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  74. Ischoda Yacht Club Inc

    EIN 060401540 · Headquarters: NORWALK, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  75. Islamic American Society of Connecticut (IASC)

    EIN 261161174 · Headquarters: Waterbury, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  76. Islamic Association of Central Connecticut Inc

    EIN 800349115 · Headquarters: New Britain, CT, USA · Religion Related · Latest available filing year: 2018 · Primary form: IRS Form 990

  77. Islamic Association of Southern Connecticut Inc

    EIN 275168534 · Headquarters: Meriden, CT, USA · Religion Related · Latest available filing year: 2023 · Primary form: IRS Form 990

  78. Islamic Center of Wallingford

    EIN 264256823 · Headquarters: WALLINGFORD, CT, USA · Religion Related · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  79. Islamic Center of Windsor Locks Inc

    EIN 454372748 · Headquarters: Windsor Locks, CT, USA · Religion Related · Latest available filing year: 2016 · Primary form: IRS Form 990

  80. Islamic Community of Fairfield County

    EIN 060934625 · Headquarters: MONROE, CT, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  81. Islamic Family Services Inc

    EIN 853497385 · Headquarters: Stamford, CT, US · Human Services · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  82. Islamic Institute of Ahl Albait

    EIN 223478749 · Headquarters: East hartford, CT, US · Religion Related · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  83. Islamic Recovery

    EIN 992429535 · Headquarters: Danbury, CT, US · Mental Health & Crisis Intervention · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  84. Islamic Society of Stamford Iss Connecticut

    EIN 061492669 · Headquarters: Fairfield, CT, US · Religion Related · Latest available filing year: 2013 · Primary form: IRS Form 990-N

  85. Island Avenue School PTO

    EIN 061368109 · Headquarters: Madison, CT, US · Education · Latest available filing year: 2019 · Primary form: IRS Form 990-N

  86. Island Reflections Dance Theatre Company Llc

    EIN 460550706 · Headquarters: Hartford, CT, US · Unknown & Unclassified · Latest available filing year: 2021 · Primary form: IRS Form 990-N

  87. Island Reflections Dance Theatre Inc

    EIN 863284340 · Headquarters: Hartford, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  88. Isnt That Special Foundation Inc

    EIN 061610792 · Headquarters: West Hartford, CT, US · Education · Latest available filing year: 2012 · Primary form: IRS Form 990-N

  89. Israel Charity Fund

    EIN 822536241 · Headquarters: Waterbury, CT, USA · International, Foreign Affairs & National Security · Latest available filing year: 2022 · Primary form: IRS Form 990

  90. Israel of the Nations Hebrew Christian Ministries Inc

    EIN 870763918 · Headquarters: Norwalk, CT, US · Religion Related · Latest available filing year: 2008 · Primary form: IRS Form 990-N

  91. Israel Putnam House Association of Connecticut Inc

    EIN 237350423 · Headquarters: Greenwich, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  92. Israel Putnam Pto Inc

    EIN 463673606 · Headquarters: Meriden, CT, US · Education · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  93. Israel-palestinian Cooperative for Economic Expansion Inc

    EIN 453005555 · Headquarters: WOODBURY, CT, US · Human Services · Latest available filing year: 2018 · Primary form: IRS Form 990-N

  94. Israelis-in-ct Inc

    EIN 810886455 · Headquarters: westport, CT, US · Arts, Culture & Humanities · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  95. Isthmian Gallery

    EIN 454053514 · Headquarters: Marlborough, CT, US · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  96. It Starts at Home

    EIN 844763650 · Headquarters: Thompson, CT, US · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  97. It Takes a Village Hill

    EIN 842731385 · Headquarters: Willington, CT, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  98. Italian American Club of Windsor Locks Inc

    EIN 060401696 · Headquarters: WINDSOR LOCKS, CT, USA · Recreation & Sports · Latest available filing year: 2018 · Primary form: IRS Form 990-EZ

  99. Italian American Friendship Club

    EIN 060401703 · Headquarters: TOLLAND, CT, USA · Unknown & Unclassified · Latest available filing year: 2018 · Primary form: IRS Form 990-EZ

  100. Italian American Historical Society of Greater New Haven Inc

    EIN 061004113 · Headquarters: EAST HAVEN, CT, US · Arts, Culture & Humanities · Latest available filing year: 2024 · Primary form: IRS Form 990-N

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