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. Institute of Management Accountants Inc

    EIN 237353145 · Headquarters: HARTFORD, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  2. Institute of Management Accountants Inc

    EIN 237353613 · Headquarters: HAMDEN, CT, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  3. Institute of Management Accountants Inc

    EIN 237354321 · Headquarters: MOOSUP, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  4. Institute of Management Accountants Inc

    EIN 237391640 · Headquarters: RIDGEFIELD, CT, US · Community Improvement & Capacity Building · Latest available filing year: 2013 · Primary form: IRS Form 990-N

  5. Institute of Management Accountants Inc

    EIN 237453555 · Headquarters: STRATFORD, CT, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  6. Institute of Management Accountants Inc

    EIN 510141207 · Headquarters: BRIDGEPORT, CT, US · Unknown & Unclassified · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  7. Institute of RE Management CT Chptr # 51

    EIN 510203835 · Headquarters: Bloomfield, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  8. Institute on Religion in an Age of Science

    EIN 046063856 · Headquarters: Coventry, CT, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  9. Instituteofmanagementaccountantsinc

    EIN 237353194 · Headquarters: SHELTON, CT, US · Environment · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  10. Instructors of Handicapped Inc

    EIN 066060183 · Headquarters: Manchester, CT, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  11. Insulators Local #33 Scholarship Fund Inc

    EIN 931878810 · Headquarters: WALLINGFORD, CT, USA · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-EZ

  12. Insurance Association of Connecticu

    EIN 060728625 · Headquarters: HARTFORD, CT, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  13. Insurance City Repeater Club

    EIN 061243783 · Headquarters: Bristrol, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  14. Int Assn Firefighters Local 1081

    EIN 066074544 · Headquarters: WESTPORT, CT, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  15. Int'l Assoc of Bridge Structural Ormtl Reinforcing Ironworkers Lcl 12 Hlth Fd

    EIN 141512728 · Headquarters: WALLINGFORD, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  16. Int'l Assoc of Lions 9043 Southington Lions Club

    EIN 066081963 · Headquarters: SOUTHINGTON, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  17. Int'l Association of Firefighters New Canaan Firefighters Benevolent

    EIN 061258034 · Headquarters: NEW CANAAN, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  18. Int'l Bro of Elect Workers Local 42 Occsafetyhealth and Education Trust Fd

    EIN 061062697 · Headquarters: EAST WINDSOR, CT, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  19. Intach USA

    EIN 203317407 · Headquarters: newtown, CT, US · Arts, Culture & Humanities · Latest available filing year: 2010 · Primary form: IRS Form 990-N

  20. Intandem Impact Foundation

    EIN 921836511 · Headquarters: Westport, CT, US · Civil Rights, Social Action & Advocacy · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  21. Integral Health Services Inc

    EIN 060943750 · Headquarters: Woodstock, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  22. Integral Life Foundation Inc

    EIN 061417212 · Headquarters: EAST LYME, CT, US · Religion Related · Latest available filing year: 2019 · Primary form: IRS Form 990-N

  23. Integrated Day Charter School Foundation Inc

    EIN 061540965 · Headquarters: Norwich, CT, US · Education · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  24. Integrated Health Services Inc

    EIN 208879300 · Headquarters: East Hartford, CT, USA · Health Care · Latest available filing year: 2024 · Primary form: IRS Form 990

  25. Integrated Refugee and Immigrant Services

    EIN 060653044 · Headquarters: NEW HAVEN, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  26. Intelligent Transportation Society of America Its America

    EIN 061495684 · Headquarters: Glastonbury, CT, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  27. Intempo Organization Inc

    EIN 900725572 · Headquarters: STAMFORD, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  28. Intenational Association of Lions Clubs

    EIN 237091322 · Headquarters: Killingworth, CT, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  29. Intenational Brotherhood of Teamsters

    EIN 030004431 · Headquarters: New Haven, CT, US · Employment · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  30. Intense Intestines Foundation Inc

    EIN 271750958 · Headquarters: STAMFORD, CT, US · Diseases, Disorders & Medical Disciplines · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  31. Intensive Education Academy Inc

    EIN 061077091 · Headquarters: WEST HARTFORD, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  32. Inter Ed Incorporated

    EIN 060922193 · Headquarters: HIGGANUM, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  33. Inter Prosperity Inc

    EIN 753161919 · Headquarters: EAST HAVEN, CT, US · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2014 · Primary form: IRS Form 990-N

  34. Inter-service Clubs Committee of New Haven Inc

    EIN 060621276 · Headquarters: ORANGE, CT, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  35. Interact Networking Club

    EIN 061431411 · Headquarters: Norwalk, CT, US · Unknown & Unclassified · Latest available filing year: 2018 · Primary form: IRS Form 990-N

  36. Interactive Educational Theatre Inc

    EIN 061440440 · Headquarters: Fairfield, CT, USA · Arts, Culture & Humanities · Latest available filing year: 2024 · Primary form: IRS Form 990

  37. Intercommunity Inc

    EIN 060954809 · Headquarters: EAST HARTFORD, CT, USA · Mental Health & Crisis Intervention · Latest available filing year: 2024 · Primary form: IRS Form 990

  38. Intercommunity Recovery Centers Inc

    EIN 060888026 · Headquarters: EAST HARTFORD, CT, USA · Mental Health & Crisis Intervention · Latest available filing year: 2017 · Primary form: IRS Form 990

  39. Intercultural Institute of Connecticut Inc

    EIN 205036369 · Headquarters: Kent, CT, US · Arts, Culture & Humanities · Latest available filing year: 2012 · Primary form: IRS Form 990-N

  40. Interdistrict Committee For Project Oceanology

    EIN 060896672 · Headquarters: Groton, CT, USA · Science & Technology · Latest available filing year: 2024 · Primary form: IRS Form 990

  41. Interdistrict School for Arts and Communication Inc

    EIN 061473576 · Headquarters: New London, CT, USA · Education · Latest available filing year: 2024 · Primary form: IRS Form 990

  42. Interface Center

    EIN 061080227 · Headquarters: New Milford, CT, USA · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2023 · Primary form: IRS Form 990

  43. Interfaith AIDS Ministry of Greater Danbury Inc

    EIN 061314001 · Headquarters: DANBURY, CT, USA · Diseases, Disorders & Medical Disciplines · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  44. Interfaith Council of Southwestern Connecticut Inc

    EIN 066011553 · Headquarters: Stamford, CT, USA · Unknown & Unclassified · Latest available filing year: 2017 · Primary form: IRS Form 990-EZ

  45. Interfaith Counseling and Pastoral Care Services Inc

    EIN 061300860 · Headquarters: AVON, CT, US · Religion Related · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  46. Interfaith Homesinc C/o Stratford Managementllc

    EIN 066085454 · Headquarters: BLOOMFIELD, CT, USA · Housing & Shelter · Latest available filing year: 2024 · Primary form: IRS Form 990

  47. Interfaith Housing Inc

    EIN 066086558 · Headquarters: NEW BRITAIN, CT, USA · Housing & Shelter · Latest available filing year: 2024 · Primary form: IRS Form 990

  48. Interfaith Human Services of Putnam

    EIN 061587623 · Headquarters: PUTNAM, CT, USA · Food, Agriculture & Nutrition · Latest available filing year: 2024 · Primary form: IRS Form 990

  49. Interfaith Service Committee of New Canaan

    EIN 066062346 · Headquarters: New Canaan, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  50. Interfaith Social Action Corporationinc

    EIN 061034018 · Headquarters: DANBURY, CT, USA · Human Services · Latest available filing year: 2024 · Primary form: IRS Form 990

  51. Interfaith Special Needs Fund Inc

    EIN 222514127 · Headquarters: BLOOMFIELD, CT, US · Religion Related · Latest available filing year: 2017 · Primary form: IRS Form 990-N

  52. Interfaith Volunteer Caregivers of Great

    EIN 481306407 · Headquarters: HAMDEN, CT, USA · Human Services · Latest available filing year: 2023 · Primary form: IRS Form 990

  53. Intergroup Association of Fairfield County Inc

    EIN 384381325 · Headquarters: Darien, CT, US · Human Services · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  54. Interior Design Society Connecticut Chapter

    EIN 320477508 · Headquarters: Milford, CT, US · Community Improvement & Capacity Building · Latest available filing year: 2015 · Primary form: IRS Form 990-N

  55. Internaitonal Association of Fire Fighters

    EIN 061539870 · Headquarters: Middletown, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  56. International 180185 Club Inc

    EIN 953442835 · Headquarters: ONECO, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  57. International Academic Friends of Israel Inc

    EIN 510435358 · Headquarters: GREENWICH, CT, USA · Education · Latest available filing year: 2018 · Primary form: IRS Form 990-EZ

  58. International Academy of Fine Art

    EIN 411942190 · Headquarters: New Haven, CT, USA · International, Foreign Affairs & National Security · Latest available filing year: 2024 · Primary form: IRS Form 990

  59. International AIDS Economics Network Inc

    EIN 205957502 · Headquarters: South Glastonbury, CT, US · Diseases, Disorders & Medical Disciplines · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  60. International Alliance for Children Inc

    EIN 510189731 · Headquarters: NEW MILFORD, CT, US · International, Foreign Affairs & National Security · Latest available filing year: 2018 · Primary form: IRS Form 990-N

  61. International Alliance of Theatrical Stage Employees Local 84

    EIN 060925943 · Headquarters: HARTFORD, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  62. International Anahuac Medical Alumni Association

    EIN 812610194 · Headquarters: WOODBRIDGE, CT, US · Unknown & Unclassified · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  63. International Assoc for Aquatic Animal Medicine

    EIN 237430494 · Headquarters: STAMFORD, CT, USA · Animal Related · Latest available filing year: 2024 · Primary form: IRS Form 990

  64. International Assoc of Bridge Struct & Ornamen Iron Workers

    EIN 060938503 · Headquarters: Eastford, CT, US · Employment · Latest available filing year: 2014 · Primary form: IRS Form 990-N

  65. International Assoc of Bridge Struct Ornamental & Reinfor Ironworkers Lu 424

    EIN 060400755 · Headquarters: NORTH HAVEN, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  66. International Assoc of Bridge Struct Ornamental and Reinforcing Iw 15

    EIN 060400743 · Headquarters: HARTFORD, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  67. International Assoc of Fire Fighte Local 830

    EIN 066084748 · Headquarters: NORWALK, CT, USA · Public Safety, Disaster Preparedness & Relief · Latest available filing year: 2024 · Primary form: IRS Form 990

  68. International Assoc of Firefighters 801 Iaff

    EIN 066068822 · Headquarters: DANBURY, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  69. International Assoc of Firefighters Local 825

    EIN 066049296 · Headquarters: NEW HAVEN, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  70. International Assoc of Lions Clubs

    EIN 066043154 · Headquarters: Old Greenwich, CT, US · Community Improvement & Capacity Building · Latest available filing year: 2012 · Primary form: IRS Form 990-N

  71. International Association Fire Fighters Local 1339

    EIN 066069176 · Headquarters: WATERBURY, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  72. International Association Heat & Frost Insulators Local 33

    EIN 060386905 · Headquarters: WALLINGFORD, CT, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  73. International Association of Administrative Professionals

    EIN 043775187 · Headquarters: Groton, CT, US · Community Improvement & Capacity Building · Latest available filing year: 2012 · Primary form: IRS Form 990-N

  74. International Association of Administrative Professionals

    EIN 066068709 · Headquarters: Hartford, CT, US · Community Improvement & Capacity Building · Latest available filing year: 2013 · Primary form: IRS Form 990-N

  75. International Association of Administrative Professionals

    EIN 066076482 · Headquarters: Terryville, CT, US · Community Improvement & Capacity Building · Latest available filing year: 2013 · Primary form: IRS Form 990-N

  76. International Association of Administrative Professionals

    EIN 320255324 · Headquarters: Stamford, CT, US · Community Improvement & Capacity Building · Latest available filing year: 2013 · Primary form: IRS Form 990-N

  77. International Association of Assessing Officers

    EIN 061472329 · Headquarters: Rocky Hill, CT, US · Crime & Legal Related · Latest available filing year: 2017 · Primary form: IRS Form 990-N

  78. International Association of Business Communicators

    EIN 132887307 · Headquarters: Norwalk, CT, US · Arts, Culture & Humanities · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  79. International Association of Electrical Inspectors

    EIN 066048864 · Headquarters: Ellington, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  80. International Association of Emts and Paramedics Local 294

    EIN 454883288 · Headquarters: CROMWELL, CT, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  81. International Association of Fire

    EIN 066084744 · Headquarters: WEST HARTFORD, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  82. International Association of Fire

    EIN 900987532 · Headquarters: WATERFORD, CT, US · Employment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  83. International Association of Fire Fighte LO786 Stamford Prof Fire Fighters Asscoa

    EIN 066069175 · Headquarters: Stamford, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  84. International Association of Fire Fighte Local 773 Bristol Firefighters

    EIN 066069939 · Headquarters: BRISTOL, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  85. International Association of Fire Fighters

    EIN 046313024 · Headquarters: Groton, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  86. International Association of Fire Fighters

    EIN 061179599 · Headquarters: enfield, CT, US · Public Safety, Disaster Preparedness & Relief · Latest available filing year: 2014 · Primary form: IRS Form 990-N

  87. International Association of Fire Fighters

    EIN 061361112 · Headquarters: Ledyard, CT, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  88. International Association of Fire Fighters

    EIN 061468099 · Headquarters: Stratford, CT, US · Public Safety, Disaster Preparedness & Relief · Latest available filing year: 2012 · Primary form: IRS Form 990-N

  89. International Association of Fire Fighters

    EIN 061496892 · Headquarters: East Hartford, CT, US · Public Safety, Disaster Preparedness & Relief · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  90. International Association of Fire Fighters

    EIN 061533910 · Headquarters: Tolland, CT, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  91. International Association of Fire Fighters

    EIN 066045365 · Headquarters: New London, CT, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  92. International Association of Fire Fighters

    EIN 202308673 · Headquarters: TORRINGTON, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  93. International Association of Fire Fighters

    EIN 202329018 · Headquarters: Mansfield, CT, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  94. International Association of Fire Fighters

    EIN 237110817 · Headquarters: Southington, CT, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  95. International Association of Fire Fighters

    EIN 300062430 · Headquarters: GUILFORD, CT, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  96. International Association of Fire Fighters

    EIN 364544598 · Headquarters: Somers, CT, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  97. International Association of Fire Fighters

    EIN 473295333 · Headquarters: Windsor Locks, CT, US · Public Safety, Disaster Preparedness & Relief · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  98. International Association of Fire Fighters

    EIN 510251037 · Headquarters: Groton, CT, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  99. International Association of Fire Fighters

    EIN 550840817 · Headquarters: Milford, CT, US · Public Safety, Disaster Preparedness & Relief · Latest available filing year: 2012 · Primary form: IRS Form 990-N

  100. International Association of Fire Fighters

    EIN 800390200 · Headquarters: Mashantucket, CT, US · Employment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

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