Nonprofits in Washington, District of Columbia

Nonprofits in Washington, District of Columbia. Browse 18,177 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 Labor Communications Association

    EIN 530232074 · Headquarters: WASHINGTON, DC, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  2. International Labor Rights Forum

    EIN 521497461 · Headquarters: WASHINGTON, DC, USA · International, Foreign Affairs & National Security · Latest available filing year: 2024 · Primary form: IRS Form 990

  3. International Lactation Consultant Association

    EIN 541329096 · Headquarters: WASHINGTON, DC, USA · Health Care · Latest available filing year: 2024 · Primary form: IRS Form 990

  4. International Law Association - American Branch

    EIN 136167151 · Headquarters: WASHINGTON, DC, USA · Social Science · Latest available filing year: 2015 · Primary form: IRS Form 990-EZ

  5. International Law Institute

    EIN 521298657 · Headquarters: WASHINGTON, DC, USA · International, Foreign Affairs & National Security · Latest available filing year: 2024 · Primary form: IRS Form 990

  6. International Law Students Association

    EIN 521903945 · Headquarters: Washington, DC, USA · International, Foreign Affairs & National Security · Latest available filing year: 2024 · Primary form: IRS Form 990

  7. International Leadership Foundation

    EIN 943362322 · Headquarters: WASHINGTON, DC, USA · Public & Societal Benefit · Latest available filing year: 2024 · Primary form: IRS Form 990

  8. International League Against Epilepsy

    EIN 521298610 · Headquarters: Washington, DC, USA · Health Care · Latest available filing year: 2024 · Primary form: IRS Form 990

  9. International Legal Finance Association

    EIN 852827042 · Headquarters: WASHINGTON, DC, USA · Community Improvement & Capacity Building · Latest available filing year: 2024 · Primary form: IRS Form 990

  10. International Life Sciences Institute

    EIN 521131788 · Headquarters: WASHINGTON, DC, USA · Science & Technology · Latest available filing year: 2024 · Primary form: IRS Form 990

  11. International Lifeline Fund

    EIN 810629010 · Headquarters: WASHINGTON, DC, USA · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2024 · Primary form: IRS Form 990

  12. International Liquid Terminals Association

    EIN 521038765 · Headquarters: WASHINGTON, DC, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  13. International Management and Development Insitute

    EIN 237110045 · Headquarters: WASHINGTON, DC, USA · International, Foreign Affairs & National Security · Latest available filing year: 2010 · Primary form: IRS Form 990

  14. International Maritime Chamber for Economic Affairs

    EIN 473161000 · Headquarters: Washington, DC, US · Unknown & Unclassified · Latest available filing year: 2018 · Primary form: IRS Form 990-N

  15. International Masonry Foundation

    EIN 521826985 · Headquarters: WASHINGTON, DC, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  16. International Mayan League

    EIN 030331316 · Headquarters: Washington, DC, USA · Civil Rights, Social Action & Advocacy · Latest available filing year: 2025 · Primary form: IRS Form 990

  17. International Microfinance Organization Network-imon

    EIN 811980738 · Headquarters: Washington, DC, USA · International, Foreign Affairs & National Security · Latest available filing year: 2020 · Primary form: IRS Form 990

  18. International Mission Evangelism-

    EIN 521861098 · Headquarters: washington, DC, US · Religion Related · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  19. International Mission for Relief

    EIN 990976820 · Headquarters: WASHINGTON, DC, USA · Public Safety, Disaster Preparedness & Relief · Latest available filing year: 2025 · Primary form: IRS Form 990-PF

  20. International Monetary Conference

    EIN 237244320 · Headquarters: WASHINGTON, DC, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  21. International Monetary Fund Staff Association Committee

    EIN 521323228 · Headquarters: WASHINGTON, DC, USA · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990

  22. International Moral Court

    EIN 992003192 · Headquarters: Washington, DC, US · International, Foreign Affairs & National Security · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  23. International Mothers Association Inc

    EIN 923563608 · Headquarters: Washington, DC, US · Arts, Culture & Humanities · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  24. International Neuroethics Society

    EIN 205230980 · Headquarters: WASHINGTON, DC, USA · Medical Research · Latest available filing year: 2024 · Primary form: IRS Form 990

  25. INTERNATIONAL NUCLEAR LAW ASSOCIATION- UNITED STATES CHAPTER William Horin Winston & Strawn LLP

    EIN 832998798 · Headquarters: Washington, DC, USA · Community Improvement & Capacity Building · Latest available filing year: 2023 · Primary form: IRS Form 990-EZ

  26. International Ocean Science and Technology Industry Association

    EIN 822757625 · Headquarters: Washington, DC, US · Community Improvement & Capacity Building · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  27. International Ombudsman for Investors Corporation

    EIN 464534005 · Headquarters: Washington, DC, US · Unknown & Unclassified · Latest available filing year: 2018 · Primary form: IRS Form 990-N

  28. International Order of the Sword and the Pen

    EIN 541889162 · Headquarters: Washington, DC, US · Mutual & Membership Benefit · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  29. International Organization Development Association

    EIN 521502374 · Headquarters: Washington, DC, US · Community Improvement & Capacity Building · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  30. International Organization for the Promotion of Tolerance Inc

    EIN 455044092 · Headquarters: Washington, DC, US · Civil Rights, Social Action & Advocacy · Latest available filing year: 2013 · Primary form: IRS Form 990-N

  31. International Peace & Security Institute

    EIN 270586846 · Headquarters: Washington, DC, USA · International, Foreign Affairs & National Security · Latest available filing year: 2013 · Primary form: IRS Form 990

  32. International Peace Award USA

    EIN 900648646 · Headquarters: WASHINGTON, DC, US · International, Foreign Affairs & National Security · Latest available filing year: 2020 · Primary form: IRS Form 990-N

  33. International Peace Operations Association

    EIN 542033637 · Headquarters: WASHINGTON, DC, USA · Community Improvement & Capacity Building · Latest available filing year: 2024 · Primary form: IRS Form 990

  34. International Pension Foundation

    EIN 522287615 · Headquarters: Washington, DC, US · International, Foreign Affairs & National Security · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  35. International Plant Nutrition Institute Inc

    EIN 530026300 · Headquarters: WASHINGTON, DC, USA · Community Improvement & Capacity Building · Latest available filing year: 2019 · Primary form: IRS Form 990

  36. International Premium Cigar and Pipe Retailers Association Inc

    EIN 135342320 · Headquarters: WASHINGTON, DC, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  37. International Productivity Service

    EIN 521621539 · Headquarters: Washington, DC, US · Arts, Culture & Humanities · Latest available filing year: 2008 · Primary form: IRS Form 990-N

  38. International Professional Partnerships for Sierra Leone Inc

    EIN 900520243 · Headquarters: Washington, DC, US · International, Foreign Affairs & National Security · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  39. International Qeerroo or Youth Support Group Inc

    EIN 472596157 · Headquarters: Washington, DC, US · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  40. International Reading Association Inc

    EIN 581553400 · Headquarters: Washington, DC, US · Education · Latest available filing year: 2007 · Primary form: IRS Form 990-N

  41. International Religious Freedom Summit

    EIN 923825690 · Headquarters: WASHINGTON, DC, United States · Religion Related · Latest available filing year: 2025 · Primary form: IRS Form 990

  42. International Republican Institute

    EIN 521340267 · Headquarters: Washington, DC, United States · Education · Latest available filing year: 2023 · Primary form: IRS Form 990

  43. International Rights Advocates Inc

    EIN 208902110 · Headquarters: Washington, DC, USA · Human Services · Latest available filing year: 2025 · Primary form: IRS Form 990

  44. International Ripple Business Association Inc

    EIN 472559696 · Headquarters: Washington, DC, US · Unknown & Unclassified · Latest available filing year: 2014 · Primary form: IRS Form 990-N

  45. International School of Belgrade Inc

    EIN 237197814 · Headquarters: WASHINGTON, DC, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  46. International School of Islamabad Society

    EIN 460659001 · Headquarters: WASHINGTON, DC, USA · Religion Related · Latest available filing year: 2016 · Primary form: IRS Form 990

  47. International Sea Glass Association Inc

    EIN 205383052 · Headquarters: Washington, DC, USA · Human Services · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  48. International Sealing Distribution Association

    EIN 411722960 · Headquarters: Washington, DC, USA · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990

  49. International Service Animals

    EIN 844517546 · Headquarters: Washington, DC, US · Mental Health & Crisis Intervention · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  50. International Sikh Organization Inc

    EIN 521463527 · Headquarters: Washington, DC, US · Religion Related · Latest available filing year: 2013 · Primary form: IRS Form 990-N

  51. International Social Development and Sports Foundation

    EIN 521270481 · Headquarters: WASHINGTON, DC, USA · Recreation & Sports · Latest available filing year: 2016 · Primary form: IRS Form 990

  52. International Society for Advancement of Cytometry

    EIN 850319221 · Headquarters: Washington, DC, USA · Medical Research · Latest available filing year: 2024 · Primary form: IRS Form 990

  53. International Society for Biosafety Research

    EIN 274899426 · Headquarters: Washington, DC, USA · Science & Technology · Latest available filing year: 2025 · Primary form: IRS Form 990

  54. International Society for Computerized Electrocard

    EIN 330102870 · Headquarters: WASHINGTON, DC, USA · Arts, Culture & Humanities · Latest available filing year: 2020 · Primary form: IRS Form 990

  55. International Society for Disaster Medical Coordination

    EIN 273864814 · Headquarters: Washington, DC, US · Public Safety, Disaster Preparedness & Relief · Latest available filing year: 2021 · Primary form: IRS Form 990-N

  56. International Society for Microbial Electrochemical Technologies

    EIN 453626697 · Headquarters: Washington, DC, US · Science & Technology · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  57. International Society for Pharmacoepidemiology

    EIN 411688677 · Headquarters: Washington, DC, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  58. International Society for Research on Emotions Inc

    EIN 651173858 · Headquarters: Washington, DC, US · Community Improvement & Capacity Building · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  59. International Society for the Study of Early Medieval England

    EIN 953739755 · Headquarters: WASHINGTON, DC, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-PF

  60. International Society for the Study of Fatty Acids and Lipids

    EIN 873756804 · Headquarters: WASHINGTON, DC, USA · Medical Research · Latest available filing year: 2025 · Primary form: IRS Form 990

  61. International Society for the Study of Xenobiotics

    EIN 222432063 · Headquarters: WASHINGTON, DC, USA · Science & Technology · Latest available filing year: 2024 · Primary form: IRS Form 990

  62. International Society of Catastrophic Managers C/o Reins Asso of America

    EIN 204536140 · Headquarters: WASHINGTON, DC, USA · Community Improvement & Capacity Building · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  63. International Society of Hymenopterists

    EIN 521730809 · Headquarters: Washington, DC, US · Mutual & Membership Benefit · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  64. International Society of Nutrigenetics and Nutrigenomics

    EIN 873291745 · Headquarters: Washington, DC, USA · Education · Latest available filing year: 2025 · Primary form: IRS Form 990-PF

  65. International Special Events Society

    EIN 541497642 · Headquarters: Washington, DC, US · Unknown & Unclassified · Latest available filing year: 2019 · Primary form: IRS Form 990-N

  66. International Spinal Endoscopy Research Foundation Inc

    EIN 994120198 · Headquarters: washington, DC, US · Medical Research · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  67. International Spy Museum

    EIN 461479450 · Headquarters: Washington, DC, USA · Arts, Culture & Humanities · Latest available filing year: 2024 · Primary form: IRS Form 990

  68. International Stevia Council Inc

    EIN 273003345 · Headquarters: WASHINGTON, DC, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  69. International Student Conferences Inc

    EIN 521155779 · Headquarters: WASHINGTON, DC, USA · International, Foreign Affairs & National Security · Latest available filing year: 2024 · Primary form: IRS Form 990

  70. International Student House

    EIN 536009405 · Headquarters: WASHINGTON, DC, USA · International, Foreign Affairs & National Security · Latest available filing year: 2024 · Primary form: IRS Form 990

  71. International Sugar Trade Coalition

    EIN 134350558 · Headquarters: Washington, DC, US · Community Improvement & Capacity Building · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  72. International Tax and Investment Center

    EIN 521852434 · Headquarters: WASHINGTON, DC, USA · Public & Societal Benefit · Latest available filing year: 2024 · Primary form: IRS Form 990

  73. International Technical Caramel Association C/o B&c Consortia Management Llc

    EIN 521072092 · Headquarters: WASHINGTON, DC, USA · Community Improvement & Capacity Building · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  74. International Telecommunications Society

    EIN 510311377 · Headquarters: WASHINGTON, DC, USA · Social Science · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  75. International Telecomputing Consortium Inc

    EIN 521659637 · Headquarters: Washington, DC, US · International, Foreign Affairs & National Security · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  76. International Trade Union Confederation Ltd

    EIN 271269519 · Headquarters: WASHINGTON, DC, USA · International, Foreign Affairs & National Security · Latest available filing year: 2024 · Primary form: IRS Form 990

  77. International Trowel Trade Council

    EIN 521801091 · Headquarters: Washington, DC, US · Community Improvement & Capacity Building · Latest available filing year: 2014 · Primary form: IRS Form 990-N

  78. International Union of Bilateral Chambers of Commerce And

    EIN 465634271 · Headquarters: Washington, DC, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  79. International Union of Bricklayers & Allied Craftworkers

    EIN 530038250 · Headquarters: Washington, DC, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  80. International Union of Elevator Constructors

    EIN 230725260 · Headquarters: Washington, DC, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  81. International Union of Operating Engineers

    EIN 530088590 · Headquarters: Washington, DC, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  82. International Union of Operating Engineers National Training Fund

    EIN 521889259 · Headquarters: WASHINGTON, DC, USA · Employment · Latest available filing year: 2024 · Primary form: IRS Form 990

  83. International Valve Spring Wire Manufacturers Association

    EIN 521483835 · Headquarters: WASHINGTON, DC, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  84. International Women's Democracy Center

    EIN 521867900 · Headquarters: WASHINGTON, DC, USA · International, Foreign Affairs & National Security · Latest available filing year: 2024 · Primary form: IRS Form 990

  85. International Women's Forum Inc

    EIN 840919612 · Headquarters: WASHINGTON, DC, USA · Education · Latest available filing year: 2024 · Primary form: IRS Form 990

  86. International Women's Media Foundation

    EIN 521648942 · Headquarters: WASHINGTON, DC, USA · Arts, Culture & Humanities · Latest available filing year: 2024 · Primary form: IRS Form 990

  87. International Work to Live Project

    EIN 262320059 · Headquarters: Washington, DC, US · International, Foreign Affairs & National Security · Latest available filing year: 2011 · Primary form: IRS Form 990-N

  88. International Xenopus Board Inc

    EIN 473414336 · Headquarters: Washington, DC, US · Medical Research · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  89. International Youth Advocate Foundation Inc

    EIN 753150093 · Headquarters: Washington, DC, US · Youth Development · Latest available filing year: 2010 · Primary form: IRS Form 990-N

  90. International Youth Peace Forum Inc

    EIN 842186194 · Headquarters: Washington, DC, US · International, Foreign Affairs & National Security · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  91. Internet Education Foundation

    EIN 311577362 · Headquarters: WASHINGTON, DC, USA · Public & Societal Benefit · Latest available filing year: 2024 · Primary form: IRS Form 990

  92. Internet Innovation Alliance

    EIN 593785561 · Headquarters: WASHINGTON, DC, USA · Community Improvement & Capacity Building · Latest available filing year: 2023 · Primary form: IRS Form 990

  93. Internet Keep Safe Coalition

    EIN 870652102 · Headquarters: Washington, DC, USA · Education · Latest available filing year: 2024 · Primary form: IRS Form 990

  94. Internet Players

    EIN 300598639 · Headquarters: Washington, DC, US · Arts, Culture & Humanities · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  95. Internet Works

    EIN 991105024 · Headquarters: Washington, DC, USA · Community Improvement & Capacity Building · Latest available filing year: 2025 · Primary form: IRS Form 990

  96. Interprepedia Inc

    EIN 365078712 · Headquarters: Washington, DC, US · Education · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  97. Interprofessional Education Collaborative Inc

    EIN 462894031 · Headquarters: WASHINGTON, DC, USA · Health Care · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  98. Intersections Inc

    EIN 800675701 · Headquarters: Washington, DC, US · Environment · Latest available filing year: 2017 · Primary form: IRS Form 990-N

  99. Interstate Natural Gas Assn of America

    EIN 730529079 · Headquarters: WASHINGTON, DC, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  100. Intl Association of Black

    EIN 521699288 · Headquarters: WASHINGTON, DC, USA · Public Safety, Disaster Preparedness & Relief · Latest available filing year: 2023 · Primary form: IRS Form 990

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