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. On My Wings Foundation Inc

    EIN 200334810 · Headquarters: New Britain, CT, US · Diseases, Disorders & Medical Disciplines · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  2. On the Court

    EIN 922302434 · Headquarters: WEST HARTFORD, CT, USA · Recreation & Sports · Latest available filing year: 2025 · Primary form: IRS Form 990-PF

  3. On the Lamb Sanctuary Foundation

    EIN 844571129 · Headquarters: NEW CANAAN, CT, USA · Animal Related · Latest available filing year: 2025 · Primary form: IRS Form 990-PF

  4. On the Road with Sojourn Incorporated

    EIN 994310846 · Headquarters: BRIDGEPORT, CT, US · Public & Societal Benefit · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  5. On the Salt Co

    EIN 992665566 · Headquarters: OLD SAYBROOK, CT, US · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  6. Ona Mertens Hartford Public School Mentor Program Inc

    EIN 393495347 · Headquarters: West Hartford, CT, US · Education · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  7. Once Incarcerated Anonymous Oia Inc

    EIN 880688480 · Headquarters: HARTFORD, CT, US · Crime & Legal Related · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  8. Once Incarcerated Once Inc

    EIN 842808903 · Headquarters: Waterbury, CT, US · Unknown & Unclassified · Latest available filing year: 2021 · Primary form: IRS Form 990-N

  9. One Another Care Corp

    EIN 393249815 · Headquarters: Glastonbury, CT, US · Human Services · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  10. One Big Dog Animal Respite Fund

    EIN 811694503 · Headquarters: Woodbridge, CT, US · Animal Related · Latest available filing year: 2017 · Primary form: IRS Form 990-N

  11. One Big Dog Arf

    EIN 992425783 · Headquarters: Woodbridge, CT, US · Animal Related · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  12. One Bloodline- Hockey 4 Humanity Inc

    EIN 921753653 · Headquarters: Westport, CT, US · Recreation & Sports · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  13. One Body One Work

    EIN 061497066 · Headquarters: Brookfield, CT, US · Human Services · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  14. One Breath One Hope Inc

    EIN 464223599 · Headquarters: WALLINGFORD, CT, US · Diseases, Disorders & Medical Disciplines · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  15. One Can Impact

    EIN 872084311 · Headquarters: Stamford, CT, US · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  16. One Full House Inc

    EIN 300396922 · Headquarters: FARMINGTON, CT, US · Human Services · Latest available filing year: 2018 · Primary form: IRS Form 990-N

  17. One Heart for the Harvest Ministries

    EIN 850918723 · Headquarters: Stamford, CT, US · Housing & Shelter · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  18. One Last Gift Inc

    EIN 825335310 · Headquarters: Stafford Springs, CT, US · Human Services · Latest available filing year: 2020 · Primary form: IRS Form 990-N

  19. One Liberty Road Inc

    EIN 873594180 · Headquarters: New Canaan, CT, US · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  20. One Life at a Time Inc

    EIN 990381638 · Headquarters: WESTON, CT, US · International, Foreign Affairs & National Security · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  21. One Light Global Incorporated

    EIN 814017084 · Headquarters: Stamford, CT, US · International, Foreign Affairs & National Security · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  22. One Loaf Inc

    EIN 814054128 · Headquarters: Ridgefield, CT, US · Food, Agriculture & Nutrition · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  23. One Love Outdoors Inc

    EIN 331310202 · Headquarters: Newington, CT, US · Recreation & Sports · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  24. One Luv Give Back Inc

    EIN 933968984 · Headquarters: new haven, CT, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  25. One More Dog Rescue Inc

    EIN 371696432 · Headquarters: Wethersfield, CT, USA · Animal Related · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  26. One of a Kind Foundation

    EIN 261259553 · Headquarters: WOODBRIDGE, CT, USA · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2021 · Primary form: IRS Form 990-PF

  27. One Percent Foundation

    EIN 274357945 · Headquarters: Fairfield, CT, US · Diseases, Disorders & Medical Disciplines · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  28. One Refugee Child Inc

    EIN 810920338 · Headquarters: Greenwich, CT, US · Human Services · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  29. One Room Wonders Inc

    EIN 851277919 · Headquarters: WILTON, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  30. One Small Step Foundation C/o Anamika Bhondele

    EIN 861736643 · Headquarters: New Canaan, CT, USA · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2024 · Primary form: IRS Form 990-PF

  31. One Source for Longevity Readiness Inc

    EIN 471139149 · Headquarters: Fairfield, CT, US · Human Services · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  32. One Standard of Justice Inc

    EIN 812717211 · Headquarters: New Canaan, CT, US · Crime & Legal Related · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  33. One Thousand Corporation

    EIN 060922325 · Headquarters: hartford, CT, USA · Community Improvement & Capacity Building · Latest available filing year: 2016 · Primary form: IRS Form 990

  34. One Tough Cookie Inc

    EIN 843731664 · Headquarters: STAMFORD, CT, USA · Human Services · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  35. One Voice for Vets

    EIN 831750531 · Headquarters: Wethersfield, CT, US · Public & Societal Benefit · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  36. One World Medicine Inc

    EIN 611630446 · Headquarters: East Haddam, CT, US · Health Care · Latest available filing year: 2007 · Primary form: IRS Form 990-N

  37. Oneco Fire Company Number 1

    EIN 922968454 · Headquarters: Oneco, CT, US · Public Safety, Disaster Preparedness & Relief · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  38. Oneida Health Foundation Inc

    EIN 471089627 · Headquarters: Mystic, CT, US · Health Care · Latest available filing year: 2020 · Primary form: IRS Form 990-N

  39. Onesource for Risk Readiness Inc

    EIN 834644767 · Headquarters: Fairfield, CT, US · Unknown & Unclassified · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  40. Oneworldundivided Inc

    EIN 333162621 · Headquarters: STAMFORD, CT, US · International, Foreign Affairs & National Security · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  41. Onitsha First Foundation

    EIN 392918329 · Headquarters: BLOOMFIELD, CT, US · Public & Societal Benefit · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  42. Online Journalism Project Incorporated

    EIN 203296979 · Headquarters: New Haven, CT, USA · Health Care · Latest available filing year: 2025 · Primary form: IRS Form 990

  43. Ons Foundation for Clinical Research and Education Inc

    EIN 261394760 · Headquarters: GREENWICH, CT, USA · Health Care · Latest available filing year: 2025 · Primary form: IRS Form 990

  44. Onwardwell Foundation Inc

    EIN 334141958 · Headquarters: Trumbull, CT, US · Mental Health & Crisis Intervention · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  45. Oon Jai Foundation Inc

    EIN 475186555 · Headquarters: North Grosvenordale, CT, US · International, Foreign Affairs & National Security · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  46. Opeiu Local # 106

    EIN 066068934 · Headquarters: GROTON, CT, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  47. Open Arts Alliance

    EIN 453220208 · Headquarters: Greenwich, CT, US · Health Care · Latest available filing year: 2024 · Primary form: IRS Form 990

  48. Open Communities Alliance Inc

    EIN 464591657 · Headquarters: HARTFORD, CT, USA · Education · Latest available filing year: 2024 · Primary form: IRS Form 990

  49. Open Door Club 24 Hour Drop in Center

    EIN 060975881 · Headquarters: Waterbury, CT, US · Mental Health & Crisis Intervention · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  50. Open Doors Foundation Corp

    EIN 832492534 · Headquarters: WESTPORT, CT, USA · Youth Development · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  51. Open Doors Outdoors

    EIN 832178854 · Headquarters: S GLASTONBURY, CT, USA · Mental Health & Crisis Intervention · Latest available filing year: 2023 · Primary form: IRS Form 990

  52. Open Hearth Works Inc

    EIN 813045020 · Headquarters: HARTFORD, CT, USA · Human Services · Latest available filing year: 2024 · Primary form: IRS Form 990

  53. Open Hearts Open Doors Inc

    EIN 141997022 · Headquarters: Riverside, CT, US · Unknown & Unclassified · Latest available filing year: 2013 · Primary form: IRS Form 990-N

  54. Open Research in Acoustical Science and Education Inc

    EIN 844899948 · Headquarters: Norwalk, CT, US · Education · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  55. Open Your Heart Help the Community Inc

    EIN 270218427 · Headquarters: NORTHFORD, CT, USA · Diseases, Disorders & Medical Disciplines · Latest available filing year: 2012 · Primary form: IRS Form 990-EZ

  56. Opera Connecticut Inc

    EIN 061327606 · Headquarters: West Hartford, CT, US · Arts, Culture & Humanities · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  57. Opera New England of Northeastern Connecticut Inc

    EIN 060963170 · Headquarters: POMFRET, CT, USA · Arts, Culture & Humanities · Latest available filing year: 2022 · Primary form: IRS Form 990

  58. Opera Providence

    EIN 050453691 · Headquarters: NEW LONDON, CT, US · Arts, Culture & Humanities · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  59. Opera Theater of Connecticut Inc

    EIN 222810265 · Headquarters: CLINTON, CT, USA · Arts, Culture & Humanities · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  60. Opera Theatre of Yale College

    EIN 203251177 · Headquarters: New Haven, CT, US · Arts, Culture & Humanities · Latest available filing year: 2010 · Primary form: IRS Form 990-N

  61. Operacion Amor Charity Corp

    EIN 852060326 · Headquarters: New London, CT, US · Human Services · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  62. Operating Engineers Local 478 Training and Skill Improvement Fund

    EIN 060899313 · Headquarters: HAMDEN, CT, USA · Employment · Latest available filing year: 2024 · Primary form: IRS Form 990

  63. Operation Awake

    EIN 811838839 · Headquarters: Bridgeport, CT, US · Human Services · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  64. Operation Fresh Start Inc

    EIN 861244249 · Headquarters: PAWCATUCK, CT, US · Human Services · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  65. Operation Fuel Incorporated

    EIN 061253091 · Headquarters: HARTFORD, CT, USA · Housing & Shelter · Latest available filing year: 2024 · Primary form: IRS Form 990

  66. Operation Give Life Inc

    EIN 320308109 · Headquarters: Waterbury, CT, US · Diseases, Disorders & Medical Disciplines · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  67. Operation Hold Your Horses Inc

    EIN 922893931 · Headquarters: BRISTOL, CT, USA · Animal Related · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  68. Operation Hope of Fairfield Inc

    EIN 061193489 · Headquarters: FAIRFIELD, CT, USA · Housing & Shelter · Latest available filing year: 2023 · Primary form: IRS Form 990

  69. Operation Love the Children of Haiti

    EIN 271268135 · Headquarters: STAMFORD, CT, USA · International, Foreign Affairs & National Security · Latest available filing year: 2013 · Primary form: IRS Form 990

  70. Operation Music Aid

    EIN 841693277 · Headquarters: Madison, CT, US · Arts, Culture & Humanities · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  71. Operation Opioid Inc

    EIN 882917039 · Headquarters: Newington, CT, US · Animal Related · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  72. Operation Paws on the Ground Inc

    EIN 863080437 · Headquarters: NEWINGTON, CT, USA · Public & Societal Benefit · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  73. Operation Rescue Inc

    EIN 414329738 · Headquarters: sterling, CT, US · Animal Related · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  74. Operation Sail New York Inc

    EIN 133120515 · Headquarters: Stamford, CT, USA · Recreation & Sports · Latest available filing year: 2013 · Primary form: IRS Form 990-EZ

  75. Operation Unisson Inc

    EIN 611660141 · Headquarters: Vernon, CT, US · Community Improvement & Capacity Building · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  76. Operation Yuli Inc

    EIN 061404954 · Headquarters: Torrington, CT, US · Human Services · Latest available filing year: 2011 · Primary form: IRS Form 990-N

  77. Operations Special Interest Group Inc

    EIN 203336116 · Headquarters: WINDHAM, CT, US · Recreation & Sports · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  78. Opin Inc

    EIN 300386610 · Headquarters: RIVERSIDE, CT, USA · Animal Related · Latest available filing year: 2024 · Primary form: IRS Form 990

  79. Opportunability

    EIN 922789151 · Headquarters: Bristol, CT, US · Youth Development · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  80. Opportunities Industrialization Center of New Britain Inc

    EIN 060876897 · Headquarters: NEW BRITAIN, CT, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  81. Opportunities Industrialization Center of New London County Inc

    EIN 237066023 · Headquarters: NEW LONDON, CT, USA · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990

  82. Opportunity Foundation Inc

    EIN 800570967 · Headquarters: STAMFORD, CT, US · Education · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  83. Opportunity House Inc

    EIN 061051678 · Headquarters: HAMDEN, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  84. Opportunity Works Connecticut Inc

    EIN 271920727 · Headquarters: ROCKVILLE, CT, USA · Employment · Latest available filing year: 2024 · Primary form: IRS Form 990

  85. Opsail Connecticut Inc

    EIN 275076183 · Headquarters: NEW LONDON, CT, USA · Arts, Culture & Humanities · Latest available filing year: 2025 · Primary form: IRS Form 990

  86. Optimates Society Inc

    EIN 262596992 · Headquarters: New Haven, CT, US · Human Services · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  87. Optimists Tribe

    EIN 270538056 · Headquarters: Fairfield, CT, US · Youth Development · Latest available filing year: 2011 · Primary form: IRS Form 990-N

  88. Optimum Stem Education and Research Organization Inc

    EIN 862973969 · Headquarters: NEWINGTON, CT, US · Unknown & Unclassified · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  89. Optimus Health Care Inc

    EIN 060972166 · Headquarters: STRATFORD, CT, USA · Health Care · Latest available filing year: 2024 · Primary form: IRS Form 990

  90. Options Unlimited Inc

    EIN 061413593 · Headquarters: EAST HARTFORD, CT, USA · Human Services · Latest available filing year: 2024 · Primary form: IRS Form 990

  91. Opus 30 Justice Inc

    EIN 851915150 · Headquarters: Stratford, CT, US · Crime & Legal Related · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  92. Opus Organization

    EIN 843824954 · Headquarters: Stratford, CT, US · Education · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  93. Or Shalom Bisc Cemetery Assn Inc

    EIN 061502287 · Headquarters: ORANGE, CT, USA · Mutual & Membership Benefit · Latest available filing year: 2025 · Primary form: IRS Form 990

  94. Ora Curry Iii Memorial Foundation Inc

    EIN 881686036 · Headquarters: TORRINGTON, CT, US · Education · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  95. Orange Arts and Culture Council Inc

    EIN 205926214 · Headquarters: ORANGE, CT, US · Arts, Culture & Humanities · Latest available filing year: 2018 · Primary form: IRS Form 990-N

  96. Orange Cemetery Association

    EIN 060940394 · Headquarters: ORANGE, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  97. Orange Community Nursery School Inc

    EIN 066009856 · Headquarters: ORANGE, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  98. Orange Economic Development Corporation

    EIN 061527209 · Headquarters: ORANGE, CT, USA · Community Improvement & Capacity Building · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  99. Orange Food 2 Kids

    EIN 844188037 · Headquarters: ORANGE, CT, USA · Food, Agriculture & Nutrition · Latest available filing year: 2025 · Primary form: IRS Form 990-PF

  100. Orange Foundation

    EIN 060955006 · Headquarters: Orange, CT, USA · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2025 · Primary form: IRS Form 990

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