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. International Society for Selenium Research

    EIN 464863102 · Headquarters: Edwardsville, IL, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  2. International Society for Solid State Ionics

    EIN 812785724 · Headquarters: Cambridge, MA, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  3. International Society for the History of Rhetoric

    EIN 391377980 · Headquarters: ITHACA, NY, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  4. International Society for the Protection of Mustangs and Burros

    EIN 946169422 · Headquarters: RAPID CITY, SD, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  5. International Society for the Psychoanalytic Study of Organizations

    EIN 481142858 · Headquarters: Boston, MA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  6. International Society for the Study of Behavioral Development

    EIN 411414706 · Headquarters: ANN ARBOR, MI, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  7. International Society for the Study of Classical Acupuncture

    EIN 800552582 · Headquarters: Portland, OR, US · Unknown & Unclassified · Latest available filing year: 2013 · Primary form: IRS Form 990-N

  8. 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

  9. International Society for the Study of Self Injury

    EIN 275257279 · Headquarters: CHICAGO, IL, US · Unknown & Unclassified · Latest available filing year: 2021 · Primary form: IRS Form 990-N

  10. International Society for the Study of Vulvovaginal Disease

    EIN 237244966 · Headquarters: Waxhaw, NC, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  11. International Society for the Study of Work and Organizational Values

    EIN 204084483 · Headquarters: Shreveport, LA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  12. International Society for Traumatic Stress Studies

    EIN 311129675 · Headquarters: BRENTWOOD, TN, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  13. International Society of African Bioscientists & Biotechnologists I

    EIN 030591979 · Headquarters: COLUMBIA, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  14. International Society of Air Safety Investigators

    EIN 237061284 · Headquarters: STERLING, VA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  15. International Society of Appraisers

    EIN 521860413 · Headquarters: Schaumburg, Illinois, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  16. International Society of Arboricult Rocky Mountain Chapter

    EIN 840991185 · Headquarters: WESTMINSTER, CO, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  17. International Society of Arboriculture

    EIN 371004119 · Headquarters: Atlanta, GA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  18. International Society of Arboriculture Texas Chapter

    EIN 742240340 · Headquarters: ARLINGTON, TX, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  19. International Society of Automation

    EIN 066101679 · Headquarters: Wallingford, CT, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  20. International Society of Automation

    EIN 236269674 · Headquarters: Wayne, PA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  21. International Society of Automation

    EIN 237019678 · Headquarters: Aurora, CO, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  22. International Society of Automation

    EIN 237062042 · Headquarters: Easley, SC, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  23. International Society of Automation

    EIN 237151804 · Headquarters: Harahan, LA, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  24. International Society of Automation

    EIN 316051108 · Headquarters: Lawrenceburg, IN, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  25. International Society of Automation

    EIN 346559258 · Headquarters: AKRON, OH, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  26. International Society of Automation

    EIN 396094335 · Headquarters: Lena, WI, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  27. International Society of Automation

    EIN 481004660 · Headquarters: Mission, KS, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  28. International Society of Automation

    EIN 581781166 · Headquarters: Allentown, PA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  29. International Society of Automation

    EIN 626063790 · Headquarters: Decatur, TN, US · Unknown & Unclassified · Latest available filing year: 2020 · Primary form: IRS Form 990-N

  30. International Society of Automation

    EIN 741949914 · Headquarters: TEXAS CITY, TX, US · Unknown & Unclassified · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  31. International Society of Automation

    EIN 742190041 · Headquarters: Lake Jackson, TX, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  32. International Society of Automation

    EIN 742266467 · Headquarters: Austin, TX, US · Unknown & Unclassified · Latest available filing year: 2015 · Primary form: IRS Form 990-N

  33. International Society of Automation

    EIN 752199149 · Headquarters: Lewisville, TX, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  34. International Society of Automation

    EIN 760056459 · Headquarters: BEAUMONT, TX, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  35. International Society of Automation

    EIN 770023572 · Headquarters: Bakersfield, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  36. International Society of Automation

    EIN 820377079 · Headquarters: Idaho Falls, ID, US · Unknown & Unclassified · Latest available filing year: 2020 · Primary form: IRS Form 990-N

  37. International Society of Automation

    EIN 822680627 · Headquarters: Midland, TX, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  38. International Society of Automation

    EIN 843409977 · Headquarters: PITTSBURGH, PA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  39. International Society of Automation

    EIN 870943031 · Headquarters: Kingsport, TN, US · Unknown & Unclassified · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  40. International Society of Automation

    EIN 872369760 · Headquarters: Jenks, OK, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  41. International Society of Automation

    EIN 920814746 · Headquarters: Mobile, AL, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  42. International Society of Automation

    EIN 930671129 · Headquarters: Cornelius, OR, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  43. International Society of Automation

    EIN 952384557 · Headquarters: Fountain Valley, CA, US · Unknown & Unclassified · Latest available filing year: 2019 · Primary form: IRS Form 990-N

  44. International Society of Automation - Houston Section

    EIN 746061087 · Headquarters: HOUSTON, TX, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  45. International Society of Automation Carolina Golden Triangle Section

    EIN 561470830 · Headquarters: Mocksville, NC, US · Unknown & Unclassified · Latest available filing year: 2019 · Primary form: IRS Form 990-N

  46. International Society of Automation Lafayette Section

    EIN 900639750 · Headquarters: Lafayette, LA, USA · Unknown & Unclassified · Latest available filing year: 2022 · Primary form: IRS Form 990-EZ

  47. International Society of Automation St Louis Section

    EIN 436108915 · Headquarters: Saint Charles, MO, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  48. International Society of Barristers Inc

    EIN 840707247 · Headquarters: DURHAM, NC, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  49. International Society of Caricature Artists

    EIN 752591842 · Headquarters: LANCASTER, PA, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  50. International Society of Certified Employee Benefit Specialist Inc

    EIN 432050291 · Headquarters: Brookfield, WI, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  51. International Society of Certified Employee Benefit Specialists

    EIN 391396077 · Headquarters: BROOKFIELD, WI, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  52. International Society of Certified Employee Benefit Specialists Inc

    EIN 042935058 · Headquarters: Nashua, NH, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  53. International Society of Certified Employee Benefit Specialists Inc

    EIN 133293220 · Headquarters: Union, NJ, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  54. International Society of Certified Employee Benefit Specialists Inc

    EIN 141824045 · Headquarters: Schodack Landing, NY, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  55. International Society of Certified Employee Benefit Specialists Inc

    EIN 223207142 · Headquarters: Waldwick, NJ, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  56. International Society of Certified Employee Benefit Specialists Inc

    EIN 232480926 · Headquarters: Bryn Mawr, PA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  57. International Society of Certified Employee Benefit Specialists Inc

    EIN 232830830 · Headquarters: Brookfield, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  58. International Society of Certified Employee Benefit Specialists Inc

    EIN 251503564 · Headquarters: Coraopolis, PA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  59. International Society of Certified Employee Benefit Specialists Inc

    EIN 311147675 · Headquarters: COLUMBUS, OH, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  60. International Society of Certified Employee Benefit Specialists Inc

    EIN 311311299 · Headquarters: Brookfield, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  61. International Society of Certified Employee Benefit Specialists Inc

    EIN 330809839 · Headquarters: Lake Forest, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  62. International Society of Certified Employee Benefit Specialists Inc

    EIN 341661031 · Headquarters: Cleveland, OH, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  63. International Society of Certified Employee Benefit Specialists Inc

    EIN 363386713 · Headquarters: Birmingham, MI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  64. International Society of Certified Employee Benefit Specialists Inc

    EIN 363386715 · Headquarters: Baltimore, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  65. International Society of Certified Employee Benefit Specialists Inc

    EIN 363475011 · Headquarters: Evanston, IL, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  66. International Society of Certified Employee Benefit Specialists Inc

    EIN 363844644 · Headquarters: Overland Park, KS, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  67. International Society of Certified Employee Benefit Specialists Inc

    EIN 382955317 · Headquarters: Brookfield, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  68. International Society of Certified Employee Benefit Specialists Inc

    EIN 383370858 · Headquarters: Brookfield, WI, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  69. International Society of Certified Employee Benefit Specialists Inc

    EIN 391498307 · Headquarters: Brookfield, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  70. International Society of Certified Employee Benefit Specialists Inc

    EIN 421423581 · Headquarters: Brookfield, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  71. International Society of Certified Employee Benefit Specialists Inc

    EIN 431406977 · Headquarters: Saint Louis, MO, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  72. International Society of Certified Employee Benefit Specialists Inc

    EIN 470834039 · Headquarters: Omaha, NE, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  73. International Society of Certified Employee Benefit Specialists Inc

    EIN 521703865 · Headquarters: Brookfield, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  74. International Society of Certified Employee Benefit Specialists Inc

    EIN 541678189 · Headquarters: Richmond, VA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  75. International Society of Certified Employee Benefit Specialists Inc

    EIN 561707305 · Headquarters: Matthews, NC, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  76. International Society of Certified Employee Benefit Specialists Inc

    EIN 581873925 · Headquarters: Milton, GA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  77. International Society of Certified Employee Benefit Specialists Inc

    EIN 593205131 · Headquarters: New Port Richey, FL, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  78. International Society of Certified Employee Benefit Specialists Inc

    EIN 611305952 · Headquarters: Brookfield, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  79. International Society of Certified Employee Benefit Specialists Inc

    EIN 631100347 · Headquarters: Brookfield, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  80. International Society of Certified Employee Benefit Specialists Inc

    EIN 752082541 · Headquarters: Dallas, TX, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  81. International Society of Certified Employee Benefit Specialists Inc

    EIN 760196480 · Headquarters: Houston, TX, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  82. International Society of Certified Employee Benefit Specialists Inc

    EIN 841185985 · Headquarters: ELIZABETH, CO, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  83. International Society of Certified Employee Benefit Specialists Inc

    EIN 911393975 · Headquarters: Bellevue, WA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  84. International Society of Certified Employee Benefit Specialists Inc

    EIN 943037947 · Headquarters: San Francisco, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  85. International Society of Certified Employee Benefit Specialists Inc

    EIN 954020022 · Headquarters: Valencia, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  86. International Society of Certified Employee Benefits Specialists Inc

    EIN 593597242 · Headquarters: Ponte Vedra, FL, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  87. International Society of Chemical Ecology Inc

    EIN 311095098 · Headquarters: Lexington, KY, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  88. International Society of Citriculture

    EIN 953038955 · Headquarters: Riverside, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  89. International Society of Crime Prevention Practitioners

    EIN 421176860 · Headquarters: Lebanon, OR, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  90. International Society of Daughters of the Utah Pioneers Caribou Compa

    EIN 820464343 · Headquarters: BANCROFT, ID, US · Unknown & Unclassified · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  91. International Society of Daughters of Utah Pioneers

    EIN 134265809 · Headquarters: FARR WEST, UT, US · Unknown & Unclassified · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  92. International Society of Dermatology

    EIN 136114051 · Headquarters: DALLAS, TX, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  93. International Society of Differentiation

    EIN 411523283 · Headquarters: ST PAUL, MN, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  94. International Society of Explosives Engineers

    EIN 550566167 · Headquarters: WARRENSVILLE HEIGHTS, OH, USA · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990

  95. International Society of Folk Harpers and Craftsmen Inc

    EIN 954000823 · Headquarters: ANAHEIM, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  96. International Society of Furniture Designers

    EIN 561334257 · Headquarters: HIGH POINT, NC, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  97. International Society of Geographical Ophthalmology

    EIN 421301280 · Headquarters: ANN ARBOR, MI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  98. International Society of Gynecological Pathologists

    EIN 411329309 · Headquarters: CHICAGO, IL, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  99. International Society of Hair Surgeons

    EIN 710738276 · Headquarters: Chicago, IL, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  100. International Society of Heterocyclchemistry

    EIN 363066864 · Headquarters: Louisville, KY, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

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