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. Off Soundings Club

    EIN 237440166 · Headquarters: East Haven, CT, USA · Recreation & Sports · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  2. Off the Streets Inc

    EIN 270979787 · Headquarters: Bethel, CT, USA · Human Services · Latest available filing year: 2025 · Primary form: IRS Form 990

  3. Off World Theatre

    EIN 134201733 · Headquarters: Greenwich, CT, USA · Arts, Culture & Humanities · Latest available filing year: 2012 · Primary form: IRS Form 990-EZ

  4. Off-beat Players Inc

    EIN 261813535 · Headquarters: DANBURY, CT, US · Arts, Culture & Humanities · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  5. Offbeat Music

    EIN 843208973 · Headquarters: East Haddam, CT, US · Arts, Culture & Humanities · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  6. Office and Professional Employees International Union

    EIN 066068786 · Headquarters: NORTH HAVEN, CT, US · Employment · Latest available filing year: 2018 · Primary form: IRS Form 990-N

  7. Officer Brian a Aselton Memorial Scholarship Fund Inc

    EIN 260129963 · Headquarters: GLASTONBURY, CT, US · Education · Latest available filing year: 2021 · Primary form: IRS Form 990-N

  8. Ofuobi Women Organization of Connecticut

    EIN 821518823 · Headquarters: South Windsor, CT, USA · Community Improvement & Capacity Building · Latest available filing year: 2024 · Primary form: IRS Form 990-PF

  9. Ogc Charitable Foundation

    EIN 472447114 · Headquarters: RIVERSIDE, CT, USA · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2025 · Primary form: IRS Form 990-PF

  10. Ogden Housing Inc

    EIN 060987679 · Headquarters: WILTON, CT, USA · Housing & Shelter · Latest available filing year: 2024 · Primary form: IRS Form 990

  11. Ohel Yosef Yitzchok Inc

    EIN 820792073 · Headquarters: New Haven, CT, US · Religion Related · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  12. Oil Drum Art Inc

    EIN 542132642 · Headquarters: Beacon Falls, CT, US · Arts, Culture & Humanities · Latest available filing year: 2020 · Primary form: IRS Form 990-N

  13. Ok to Delay Incorporated

    EIN 993523762 · Headquarters: Riverside, CT, US · Youth Development · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  14. Old Bethlem Inc

    EIN 237099146 · Headquarters: Bethlehem, CT, US · Arts, Culture & Humanities · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  15. Old Black Point Association Inc

    EIN 060625729 · Headquarters: Niantic, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  16. Old Burial Yard of Thirty Mile Island Inc

    EIN 814656610 · Headquarters: HIGGANUM, CT, US · Mutual & Membership Benefit · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  17. Old Drake Hill Flower Bridge

    EIN 810612003 · Headquarters: Simsbury, CT, US · Recreation & Sports · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  18. Old Faithful Antique Fire Engine Company Inc

    EIN 041007620 · Headquarters: New Canaan, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  19. Old Greenwich Association

    EIN 811032309 · Headquarters: Old Greenwich, CT, US · Community Improvement & Capacity Building · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  20. Old Greenwich Retail Merchants Association

    EIN 061630692 · Headquarters: Old Greenwich, CT, US · Community Improvement & Capacity Building · Latest available filing year: 2008 · Primary form: IRS Form 990-N

  21. Old Greenwich Riverside Cheerleading Inc

    EIN 852986100 · Headquarters: Riverside, CT, USA · Recreation & Sports · Latest available filing year: 2023 · Primary form: IRS Form 990-PF

  22. Old Greenwich Riverside North Mianus Preservation Association

    EIN 822795522 · Headquarters: Old Greenwich, CT, US · Arts, Culture & Humanities · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  23. Old Greenwich School PTA

    EIN 066074547 · Headquarters: Old Greenwich, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  24. Old Greenwich Yacht Club

    EIN 510148202 · Headquarters: OLD GREENWICH, CT, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  25. Old Greenwichriverside Community Center

    EIN 060669123 · Headquarters: GREENWICH, CT, USA · Recreation & Sports · Latest available filing year: 2024 · Primary form: IRS Form 990

  26. Old Guard Inc

    EIN 066086613 · Headquarters: Bloomfield, CT, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  27. Old Hchs Inc

    EIN 060646620 · Headquarters: HARTFORD, CT, USA · Health Care · Latest available filing year: 2020 · Primary form: IRS Form 990-EZ

  28. Old Hemlock Cemetery

    EIN 066056557 · Headquarters: Colebrook, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  29. Old Jmh Inc

    EIN 060646696 · Headquarters: HARTFORD, CT, USA · Health Care · Latest available filing year: 2020 · Primary form: IRS Form 990-EZ

  30. Old Lyme Affordable Housing Corporation

    EIN 061367037 · Headquarters: South Lyme, CT, US · Housing & Shelter · Latest available filing year: 2013 · Primary form: IRS Form 990-N

  31. Old Lyme Beach Club Incorporated

    EIN 060478667 · Headquarters: East Lyme, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  32. Old Lyme Cemetery Association Inc

    EIN 060478670 · Headquarters: OLD LYME, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  33. Old Lyme Center School Pto

    EIN 854110960 · Headquarters: Old Lyme, CT, US · Education · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  34. Old Lyme Childrens Learning Center

    EIN 222808283 · Headquarters: Old Lyme, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  35. Old Lyme Country Club Inc

    EIN 060478680 · Headquarters: OLD LYME, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  36. Old Lyme Fire Department Inc

    EIN 061522371 · Headquarters: OLD LYME, CT, USA · Public Safety, Disaster Preparedness & Relief · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  37. Old Lyme Historical Society Inc

    EIN 320142847 · Headquarters: OLD LYME, CT, USA · Arts, Culture & Humanities · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  38. Old Lyme Land Trust Inc

    EIN 066085184 · Headquarters: OLD LYME, CT, USA · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990

  39. Old Lyme Rowing Association Inc

    EIN 061099817 · Headquarters: OLD LYME, CT, USA · Education · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  40. Old Lyme South End Volunteer Ambulance Association Inc

    EIN 222677959 · Headquarters: OLD LYME, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  41. Old Lyme Town Band

    EIN 223216992 · Headquarters: MOODUS, CT, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  42. Old Lyme-Phoebe Griffin Noyes Library Association

    EIN 237209074 · Headquarters: Old Lyme, CT, USA · Education · Latest available filing year: 2024 · Primary form: IRS Form 990

  43. Old New-gate Prison and Copper Mine Inc

    EIN 200267172 · Headquarters: West Suffield, CT, US · Arts, Culture & Humanities · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  44. Old Salt Works Road Beach Association Inc

    EIN 932005891 · Headquarters: Westbrook, CT, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  45. Old Saybrook Ambulance Association Inc

    EIN 237396898 · Headquarters: OLD SAYBROOK, CT, USA · Health Care · Latest available filing year: 2024 · Primary form: IRS Form 990

  46. Old Saybrook Babe Ruth Inc

    EIN 208647805 · Headquarters: Old Saybrook, CT, US · Recreation & Sports · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  47. Old Saybrook Basketball Club Inc

    EIN 821064960 · Headquarters: Old Saybrook, CT, US · Recreation & Sports · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  48. Old Saybrook Chamber Foundation Inc

    EIN 863094895 · Headquarters: OLD SAYBROOK, CT, US · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  49. Old Saybrook Chamber of Commerce Inc

    EIN 060846200 · Headquarters: OLD SAYBROOK, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  50. Old Saybrook Coastal Resilience Coalition Inc

    EIN 922947323 · Headquarters: Old Saybrook, CT, US · Environment · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  51. Old Saybrook Community Foundation Inc

    EIN 743129840 · Headquarters: Old Saybrook, CT, US · Youth Development · Latest available filing year: 2013 · Primary form: IRS Form 990-N

  52. Old Saybrook Education Foundation

    EIN 061486846 · Headquarters: OLD SAYBROOK, CT, US · Education · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  53. Old Saybrook Fire Company No1 Inc

    EIN 061009393 · Headquarters: OLD SAYBROOK, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  54. Old Saybrook High School Ram Boosters Athletic Club Inc

    EIN 815210360 · Headquarters: OLD SAYBROOK, CT, US · Recreation & Sports · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  55. Old Saybrook Historical Society

    EIN 061013438 · Headquarters: OLD SAYBROOK, CT, USA · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990

  56. Old Saybrook Land Trust Inc

    EIN 061487669 · Headquarters: OLD SAYBROOK, CT, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  57. Old Saybrook Lions Club Incorporated

    EIN 066068999 · Headquarters: OLD SAYBROOK, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  58. Old Saybrook Lions Foundation Inc

    EIN 844993597 · Headquarters: OLD SAYBROOK, CT, US · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  59. Old Saybrook Middle School Pto Inc

    EIN 811923365 · Headquarters: Old Saybrook, CT, US · Education · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  60. Old Saybrook Police Union C O P S Local 106 Inc

    EIN 066088456 · Headquarters: Old Saybrook, CT, US · Employment · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  61. Old Saybrook Riverside Cemetery Assoc In

    EIN 066038363 · Headquarters: OLD SAYBROOK, CT, USA · Mutual & Membership Benefit · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  62. Old Saybrook Senior Housing Inc

    EIN 061009394 · Headquarters: OLD SAYBROOK, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  63. Old Saybrook Soccer Club Inc

    EIN 061619781 · Headquarters: Old Saybrook, CT, US · Recreation & Sports · Latest available filing year: 2020 · Primary form: IRS Form 990-N

  64. Old Saybrook Youth Football Activities League Inc

    EIN 222959428 · Headquarters: Old Saybrook, CT, US · Recreation & Sports · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  65. Old School Bible Believers Baptist Church

    EIN 850907755 · Headquarters: Vernon, CT, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  66. Old School Social Club Inc

    EIN 204523707 · Headquarters: Wolcott, CT, US · Unknown & Unclassified · Latest available filing year: 2021 · Primary form: IRS Form 990-N

  67. Old State House Association Inc

    EIN 510175800 · Headquarters: HARTFORD, CT, USA · Arts, Culture & Humanities · Latest available filing year: 2013 · Primary form: IRS Form 990-EZ

  68. Old Stone Bridge Property Owners' Association Inc

    EIN 061031492 · Headquarters: COS COB, CT, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  69. Old Timers Athletic Association of Greater Danbury Inc

    EIN 061068001 · Headquarters: DANBURY, CT, USA · Education · Latest available filing year: 2024 · Primary form: IRS Form 990

  70. Old Timers Athletic Association of Greenwich Connecticut Inc

    EIN 066056345 · Headquarters: OLD GREENWICH, CT, USA · Education · Latest available filing year: 2025 · Primary form: IRS Form 990

  71. Old Timers Rod and Gun Club Incorporated

    EIN 136734586 · Headquarters: Brookfield, CT, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  72. Old Well Masonic Company Inc

    EIN 066035220 · Headquarters: NORWALK, CT, USA · Mutual & Membership Benefit · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  73. Old Wethersfield Stray & Kitten Rescue Inc

    EIN 882079754 · Headquarters: Wethersfield, CT, USA · Animal Related · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  74. Old Woodbury Historical Society Incorporated

    EIN 066077333 · Headquarters: WOODBURY, CT, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  75. Olde Crabs Hockey Club Inc

    EIN 141991050 · Headquarters: DANBURY, CT, USA · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2024 · Primary form: IRS Form 990

  76. Older Womens League Northwest Ct Chapter

    EIN 061216605 · Headquarters: LAKEVILLE, CT, USA · Civil Rights, Social Action & Advocacy · Latest available filing year: 2014 · Primary form: IRS Form 990-EZ

  77. Ole Farmers Association North America Inc

    EIN 270577085 · Headquarters: Stamford, CT, USA · Education · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  78. Olive E Ryan Scholarship Memorial Fund

    EIN 060970697 · Headquarters: OAKVILLE, CT, USA · Education · Latest available filing year: 2021 · Primary form: IRS Form 990-PF

  79. Oliver Ellsworth Parent Teacher Organization

    EIN 222510000 · Headquarters: Windsor, CT, US · Education · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  80. Oliver Wolcott Alumni Association

    EIN 066063029 · Headquarters: Torrington, CT, US · Education · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  81. Oliver Wolcott Library Inc

    EIN 060709304 · Headquarters: LITCHFIELD, CT, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  82. Olivieri Johnston Family Foundation

    EIN 260702182 · Headquarters: WEST HARTFORD, CT, USA · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2024 · Primary form: IRS Form 990-PF

  83. Olm Strong Foundation Inc

    EIN 824728366 · Headquarters: MADISON, CT, USA · Education · Latest available filing year: 2024 · Primary form: IRS Form 990

  84. Olympic Athletes Rowing at Saugatuck Inc

    EIN 331055179 · Headquarters: WESTPORT, CT, US · Recreation & Sports · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  85. Om Foundation Inc

    EIN 263534277 · Headquarters: Manchester, CT, USA · Religion Related · Latest available filing year: 2024 · Primary form: IRS Form 990

  86. Om Shanti Om Incorporated

    EIN 332788868 · Headquarters: Bridgeport, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  87. Omaha Foundation Inc

    EIN 465735917 · Headquarters: westport, CT, US · Arts, Culture & Humanities · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  88. Omega Community Outreach Ministries Inc

    EIN 454377515 · Headquarters: Stamford, CT, US · Human Services · Latest available filing year: 2012 · Primary form: IRS Form 990-N

  89. Omega Phi Alpha Foundation

    EIN 834360835 · Headquarters: East Lyme, CT, US · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  90. Omega Phi Alpha National Service Sororit

    EIN 742521161 · Headquarters: East Lyme, CT, USA · Education · Latest available filing year: 2024 · Primary form: IRS Form 990

  91. Omega Phi Alpha Scholarship Trust

    EIN 383307204 · Headquarters: EAST LYME, CT, USA · Education · Latest available filing year: 2015 · Primary form: IRS Form 990-PF

  92. Omega Phi Kappa Multicultural Fraternity Incorporated

    EIN 831092479 · Headquarters: Bridgeport, CT, US · Education · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  93. Omega Psi Phi Fraternity

    EIN 066087944 · Headquarters: Norwalk, CT, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  94. Omega Psi Phi Fraternity

    EIN 272867564 · Headquarters: Bridgeport, CT, US · Education · Latest available filing year: 2013 · Primary form: IRS Form 990-N

  95. Omega Psi Phi Fraternity Inc Epsilon Iota Iota

    EIN 421572836 · Headquarters: Hamden, CT, US · Community Improvement & Capacity Building · Latest available filing year: 2010 · Primary form: IRS Form 990-N

  96. Omega Psi Phi Fraternity Lambda Rho Chapter Harold J Petteway

    EIN 066088305 · Headquarters: Waterbury, CT, US · Education · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  97. Omgs Global Inc

    EIN 994581296 · Headquarters: WEST HAVEN, CT, USA · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  98. Omicron Delta Epsilon Intl Honor Society in Economics Inc

    EIN 237350239 · Headquarters: West Hartford, CT, US · Education · Latest available filing year: 2008 · Primary form: IRS Form 990-N

  99. Omni Swim Club Inc

    EIN 061246359 · Headquarters: Wethersfield, CT, US · Recreation & Sports · Latest available filing year: 2015 · Primary form: IRS Form 990-N

  100. Omni-american Project Inc

    EIN 392591146 · Headquarters: Stratford, CT, US · Human Services · Latest available filing year: 2025 · Primary form: IRS Form 990-N

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