Unknown & Unclassified nonprofits

Unknown & Unclassified nonprofits. Browse 557,756 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. National Staff Organization

    EIN 510150675 · Headquarters: COLUMBUS, OH, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  2. National Staff Organization

    EIN 510234861 · Headquarters: ENID, OK, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  3. National Staff Organization

    EIN 510280075 · Headquarters: Dover, DE, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  4. National Staff Organization

    EIN 521275751 · Headquarters: Santa Fe, NM, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  5. National Staff Organization

    EIN 521275753 · Headquarters: Raleigh, NC, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  6. National Staff Organization

    EIN 550766508 · Headquarters: Winfield, WV, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  7. National Staff Organization

    EIN 742021441 · Headquarters: DENVER, CO, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  8. National Staff Organization

    EIN 900535576 · Headquarters: Portland, OR, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  9. National Staff Organization

    EIN 900634338 · Headquarters: Salt Lake City, UT, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  10. National Staff Organization

    EIN 990209658 · Headquarters: Honolulu, HI, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  11. National Staff Organization Indiana Professional Staff Org

    EIN 510234860 · Headquarters: NOBLESVILLE, IN, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  12. National Staff Organization-Nevada Nso-Nevada

    EIN 880276071 · Headquarters: Las Vegas, NV, US · Unknown & Unclassified · Latest available filing year: 2020 · Primary form: IRS Form 990-N

  13. National Standards Authority of Ireland Inc

    EIN 043376939 · Headquarters: NASHUA, NH, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  14. National Star Route Mail Contractors Association

    EIN 530184633 · Headquarters: VIENNA, VA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  15. National Star Route Mail Contractors Association

    EIN 586073350 · Headquarters: Conley, GA, US · Unknown & Unclassified · Latest available filing year: 2013 · Primary form: IRS Form 990-N

  16. National Star Route Mail Contractors Association

    EIN 810366064 · Headquarters: Turner, MT, US · Unknown & Unclassified · Latest available filing year: 2013 · Primary form: IRS Form 990-N

  17. National Startup Stakeholders Governing Board Lca

    EIN 873506188 · Headquarters: Denver, CO, US · Unknown & Unclassified · Latest available filing year: 2021 · Primary form: IRS Form 990-N

  18. National States Geographic Information Council

    EIN 030339575 · Headquarters: MYRTLE BEACH, SC, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  19. National Steel Corporation Represented Retirees Benefit Trust

    EIN 351964535 · Headquarters: PITTSBURGH, PA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  20. National Steering Comm of the Assoc for the Imprvmt of Minorits in IRS

    EIN 363655369 · Headquarters: Chicago, IL, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  21. National Steering Comm of the Assoc for the Imprvmt of Minorits in IRS

    EIN 431503674 · Headquarters: Kansas City, MO, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  22. National Steering Comm of the Assoc for the Imprvmt of Minorits in IRS

    EIN 521072846 · Headquarters: Upper Marlboro, MD, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  23. National Steering Comm of the Assoc for the Imprvmt of Minorits in IRS

    EIN 541507575 · Headquarters: Richmond, VA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  24. National Steering Comm of the Assoc for the Imprvmt of Minorits in IRS

    EIN 581681312 · Headquarters: Atlanta, GA, US · Unknown & Unclassified · Latest available filing year: 2021 · Primary form: IRS Form 990-N

  25. National Steering Comm of the Assoc for the Imprvmt of Minorits in IRS

    EIN 742550558 · Headquarters: Austin, TX, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  26. National Steering Comm of the Assoc for the Imprvmt of Minorits in IRS

    EIN 752195359 · Headquarters: cedar hill, TX, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  27. National Steering Comm of the Assoc for the Imprvmt of Minorits in IRS

    EIN 911408382 · Headquarters: SEATTLE, WA, US · Unknown & Unclassified · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  28. National Steering Comm of the Assoc for the Imprvmt of Minorits in IRS

    EIN 942770241 · Headquarters: Fresno, CA, US · Unknown & Unclassified · Latest available filing year: 2021 · Primary form: IRS Form 990-N

  29. National Steering Comm of the Assoc for the Imprvmt of Minorits in IRS

    EIN 943104240 · Headquarters: Oakland, CA, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  30. National Steering Comm of the Assoc for the Imprvmt of Minorits in IRS

    EIN 954236348 · Headquarters: Granada Hills, CA, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  31. National Steinbeck Center

    EIN 770006320 · Headquarters: SALINAS, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  32. National Stereoscopic Association

    EIN 237417601 · Headquarters: RANCHO PALOS VERDES, CA, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  33. National Stone Sand and Gravel Association

    EIN 521541302 · Headquarters: ALEXANDRIA, VA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  34. National Structured Settlements Trade Association

    EIN 954020047 · Headquarters: WASHINGTON, DC, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  35. National Student Employment Association Inc

    EIN 945238028 · Headquarters: AUBURN, ME, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  36. National Student Nurses' Associationinc

    EIN 136081991 · Headquarters: QUEENS VILLAGE, NY, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  37. National Student Parent Mock Election

    EIN 860578745 · Headquarters: Bethesda, MD, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  38. National Student Speech Language Hearing Association

    EIN 520976011 · Headquarters: ROCKVILLE, MD, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  39. National Stuttering Association

    EIN 942420533 · Headquarters: Sun City West, AZ, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  40. National Substitute Teachers Alliance2769

    EIN 593663602 · Headquarters: Cape Coral, FL, US · Unknown & Unclassified · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  41. National Suicide Help Center

    EIN 421236623 · Headquarters: ROCHESTER, MN, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  42. National Sunflower Association

    EIN 450362201 · Headquarters: MANDAN, ND, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  43. National Sunroom Association

    EIN 364168056 · Headquarters: CLEVELAND, OH, USA · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-EZ

  44. National Surf Schools and Instructors Association

    EIN 203272698 · Headquarters: CHESAPEAK BCH, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  45. National Surgical Assistant Association

    EIN 541123342 · Headquarters: WASHINGTON, DC, USA · Unknown & Unclassified · Latest available filing year: 2022 · Primary form: IRS Form 990

  46. National Swine Registry

    EIN 351921926 · Headquarters: WEST LAFAYETTE, IN, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  47. National Systems Contractors Association

    EIN 363092283 · Headquarters: CEDAR RAPIDS, IA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  48. National Taipei Institute of Tech Alumni Assoc of North Calif USA

    EIN 770112974 · Headquarters: San Jose, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  49. National Taiwan Normal University Alumni Association of Southern Ca

    EIN 813785891 · Headquarters: S EL MONTE, CA, US · Unknown & Unclassified · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  50. National Taiwan Ocean University Alumni Association of Southern Cal

    EIN 471691980 · Headquarters: Artisia, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  51. National Taiwan Univ Schl of Pharm Alumni Assoc in North Amer Inc

    EIN 521227868 · Headquarters: New Britain, PA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  52. National Taiwan University Alumni Assoc of So Ca

    EIN 954820933 · Headquarters: ROSEMEAD, CA, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  53. National Taiwan University Medical College Alumni Assoc Inc

    EIN 112439269 · Headquarters: Farmington, CT, US · Unknown & Unclassified · Latest available filing year: 2021 · Primary form: IRS Form 990-N

  54. National Taiwan University Medical College Alumni Foundation

    EIN 363994468 · Headquarters: BURR RIDGE, IL, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  55. National Tank Truck Carriers

    EIN 530175415 · Headquarters: ARLINGTON, VA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  56. National Tax Association

    EIN 310823849 · Headquarters: Leesburg, VA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  57. National Tax Lien Association Inc

    EIN 522036309 · Headquarters: Jupiter, FL, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  58. National Tax Limitation Coaliton

    EIN 853546076 · Headquarters: NEWCASTLE, CA, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  59. National Taxpayers Conference

    EIN 880364466 · Headquarters: Sacramento, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  60. National Taxpayers Union

    EIN 521009116 · Headquarters: WASHINGTON, DC, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  61. National Taxpayers Union Foundation

    EIN 521122683 · Headquarters: WASHINGTON, DC, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  62. National Taxpayers United of Illinois

    EIN 363017872 · Headquarters: Brookfield, IL, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  63. National Tay-sachs & Allied Diseases Ass

    EIN 131912877 · Headquarters: BRIGHTON, MA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  64. National Tay-sachs and Allied Diseases Association of Delaware Va

    EIN 231967925 · Headquarters: JENKINTOWN, PA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  65. National Tbi Traumatic Brain Injury Registry Coalition

    EIN 872947772 · Headquarters: WASHINGTON, DC, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  66. National Tec Conference

    EIN 371059204 · Headquarters: NEW ORLEANS, LA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  67. National Technical Association

    EIN 237330130 · Headquarters: Baltimore, MD, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  68. National Technical Association

    EIN 237330136 · Headquarters: Baltimore, MD, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  69. National Technical Association

    EIN 510144210 · Headquarters: WASHINGTON, DC, US · Unknown & Unclassified · Latest available filing year: 2020 · Primary form: IRS Form 990-N

  70. National Technical Association

    EIN 521699945 · Headquarters: Cincinnati, OH, US · Unknown & Unclassified · Latest available filing year: 2020 · Primary form: IRS Form 990-N

  71. National Technical Honor Society - Vc Greenville Chapter 3271

    EIN 472511808 · Headquarters: Greenville, SC, US · Unknown & Unclassified · Latest available filing year: 2015 · Primary form: IRS Form 990-N

  72. National Telecommunications Cooperative Association

    EIN 520741336 · Headquarters: Arlington, VA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  73. National Telemedia Council Tr

    EIN 396096265 · Headquarters: MILWAUKEE, WI, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-PF

  74. National Terasury Employees Union

    EIN 760019159 · Headquarters: HOUSTON, TX, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  75. National Terrazzo & Mosaic Association

    EIN 540837226 · Headquarters: Fredericksburg, TX, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  76. National Test Pilot School

    EIN 953661621 · Headquarters: MOJAVE, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  77. National Theatre Conference

    EIN 346555826 · Headquarters: Statesboro, GA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  78. National Theatre of the Deaf Inc

    EIN 061051786 · Headquarters: Washington, DC, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  79. National Thoroughbred Racing Association Inc

    EIN 133985050 · Headquarters: LEXINGTON, KY, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  80. National Tile Contractors Assn Inc

    EIN 640384951 · Headquarters: JACKSON, MS, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  81. National Tool Die & Precision Machining Assn Greater St Louis Chapter

    EIN 237032772 · Headquarters: ST LOUIS, MO, USA · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-EZ

  82. National Tooling & Machining Assoc

    EIN 391667979 · Headquarters: Richfield, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  83. National Tooling & Machining Association

    EIN 340646162 · Headquarters: CLEVELAND, OH, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  84. National Tour Association Inc

    EIN 311049903 · Headquarters: LEXINGTON, KY, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  85. National Toy Fox Terrier Association Inc

    EIN 010901714 · Headquarters: Champaign, IL, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  86. National Tractor Parts Dealer Association

    EIN 521598990 · Headquarters: GAINESVILLE, TX, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  87. National Traditional Country Music Assn

    EIN 421193556 · Headquarters: Bayard, IA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  88. National Trail Alumni Association

    EIN 320307798 · Headquarters: NEW PARIS, OH, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  89. National Trailer Dealers Association

    EIN 363751099 · Headquarters: BRIGHTON, MI, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  90. National Translator Association

    EIN 237182615 · Headquarters: Arvada, CO, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  91. National Transportation Center

    EIN 237017690 · Headquarters: MONROEVILLE, PA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  92. National Transportation Safety Organization

    EIN 381845203 · Headquarters: TROY, MI, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  93. National Trappers Association Inc

    EIN 371052878 · Headquarters: BEDFORD, IN, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  94. National Traveling Bowling League

    EIN 382368967 · Headquarters: BUFFALO, NY, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  95. National Treasurey Employees Union

    EIN 146030302 · Headquarters: CHAMPLAIN, NY, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  96. National Treasury Employee Union

    EIN 522107445 · Headquarters: Silver Spring, MD, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  97. National Treasury Employee Union

    EIN 561209491 · Headquarters: Charlotte, NC, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  98. National Treasury Employee Union

    EIN 876133174 · Headquarters: ODGEN, UT, USA · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990

  99. National Treasury Employee Union 24

    EIN 386090676 · Headquarters: DETROIT, MI, USA · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-EZ

  100. National Treasury Employee Union Chapter #145

    EIN 746091118 · Headquarters: LAREDO, TX, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

First page and all pages