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. Sigma Theta Tau International Inc

    EIN 900012731 · Headquarters: Highland Heights, KY, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  2. Sigma Theta Tau International Inc

    EIN 900012732 · Headquarters: Collegedale, TN, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  3. Sigma Theta Tau International Inc

    EIN 900012734 · Headquarters: Winston Salem, NC, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  4. Sigma Theta Tau International Inc

    EIN 900012735 · Headquarters: Rocky River, OH, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  5. Sigma Theta Tau International Inc

    EIN 900012737 · Headquarters: Aberdeen, SD, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  6. Sigma Theta Tau International Inc

    EIN 900012739 · Headquarters: Winchester, VA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  7. Sigma Theta Tau International Inc

    EIN 900012741 · Headquarters: RIPON, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  8. Sigma Theta Tau International Inc

    EIN 900012742 · Headquarters: Framingham, MA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  9. Sigma Theta Tau International Inc

    EIN 900158245 · Headquarters: Dover, DE, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  10. Sigma Theta Tau International Inc

    EIN 900264195 · Headquarters: LaPlace, LA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  11. Sigma Theta Tau International Inc

    EIN 900264197 · Headquarters: Hamden, CT, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  12. Sigma Theta Tau International Inc

    EIN 900266168 · Headquarters: Waukesha, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  13. Sigma Theta Tau International Inc

    EIN 900266169 · Headquarters: Rochester, NY, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  14. Sigma Theta Tau International Inc

    EIN 900266171 · Headquarters: Fox Point, WI, US · Unknown & Unclassified · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  15. Sigma Theta Tau International Inc

    EIN 900266179 · Headquarters: Omaha, NE, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  16. Sigma Theta Tau International Inc

    EIN 900266186 · Headquarters: Stephenville, TX, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  17. Sigma Theta Tau International Inc

    EIN 900266189 · Headquarters: Dahlonega, GA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  18. Sigma Theta Tau International Inc

    EIN 900266191 · Headquarters: Bethlehem, PA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  19. Sigma Theta Tau International Inc

    EIN 900266193 · Headquarters: Fullerton, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  20. Sigma Theta Tau International Inc

    EIN 900266196 · Headquarters: Anderson, IN, US · Unknown & Unclassified · Latest available filing year: 2019 · Primary form: IRS Form 990-N

  21. Sigma Theta Tau International Inc

    EIN 900487005 · Headquarters: Lakeland, FL, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  22. Sigma Theta Tau International Inc

    EIN 900487006 · Headquarters: Mequon, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  23. Sigma Theta Tau International Inc

    EIN 900580512 · Headquarters: Washington, DC, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  24. Sigma Theta Tau International Inc

    EIN 900656443 · Headquarters: North Canton, OH, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  25. Sigma Theta Tau International Inc

    EIN 900738320 · Headquarters: Bryan, TX, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  26. Sigma Theta Tau International Inc

    EIN 900738321 · Headquarters: SAVANNAH, GA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  27. Sigma Theta Tau International Inc

    EIN 901029447 · Headquarters: Farmingdale, NY, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  28. Sigma Theta Tau International Inc

    EIN 901029450 · Headquarters: Beverly, MA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  29. Sigma Theta Tau International Inc

    EIN 901029451 · Headquarters: Pittsburgh, PA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  30. Sigma Theta Tau International Inc

    EIN 901029452 · Headquarters: Waterbury, CT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  31. Sigma Theta Tau International Inc

    EIN 901029454 · Headquarters: Irvine, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  32. Sigma Theta Tau International Inc

    EIN 911775006 · Headquarters: Marquette, MI, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  33. Sigma Theta Tau International Inc

    EIN 911775037 · Headquarters: New Orleans, LA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  34. Sigma Theta Tau International Inc

    EIN 911935288 · Headquarters: Nashville, TN, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  35. Sigma Theta Tau International Inc

    EIN 911935291 · Headquarters: Hamilton, OH, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  36. Sigma Theta Tau International Inc

    EIN 911935292 · Headquarters: Evansville, IN, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  37. Sigma Theta Tau International Inc

    EIN 911935293 · Headquarters: McKinleyville, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  38. Sigma Theta Tau International Inc

    EIN 911935294 · Headquarters: Miami, FL, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  39. Sigma Theta Tau International Inc

    EIN 911935296 · Headquarters: Atlanta, GA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  40. Sigma Theta Tau International Inc

    EIN 911935298 · Headquarters: Flint, MI, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  41. Sigma Theta Tau International Inc

    EIN 911935299 · Headquarters: Weston, MA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  42. Sigma Theta Tau International Inc

    EIN 911935301 · Headquarters: Amherst, NY, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  43. Sigma Theta Tau International Inc

    EIN 911935302 · Headquarters: Brockport, NY, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  44. Sigma Theta Tau International Inc

    EIN 911935303 · Headquarters: New Castle, DE, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  45. Sigma Theta Tau International Inc

    EIN 911935305 · Headquarters: OMAHA, NE, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  46. Sigma Theta Tau International Inc

    EIN 911935307 · Headquarters: Nacogdoches, TX, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  47. Sigma Theta Tau International Inc

    EIN 911935310 · Headquarters: Stlouis, MO, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  48. Sigma Theta Tau International Inc

    EIN 911935312 · Headquarters: Clinton, MS, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  49. Sigma Theta Tau International Inc

    EIN 911935313 · Headquarters: Wheeling, WV, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  50. Sigma Theta Tau International Inc

    EIN 911935315 · Headquarters: Orono, ME, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  51. Sigma Theta Tau International Inc

    EIN 911935316 · Headquarters: Cincinnati, OH, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  52. Sigma Theta Tau International Inc

    EIN 911935318 · Headquarters: ONEONTA, NY, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  53. Sigma Theta Tau International Inc

    EIN 911935319 · Headquarters: Slingerlands, NY, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  54. Sigma Theta Tau International Inc

    EIN 911935320 · Headquarters: Minot, ND, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  55. Sigma Theta Tau International Inc

    EIN 912039488 · Headquarters: Fayetteville, AR, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  56. Sigma Theta Tau International Inc

    EIN 912039490 · Headquarters: Waterloo, IA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  57. Sigma Theta Tau International Inc

    EIN 912039494 · Headquarters: Aiken, SC, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  58. Sigma Theta Tau International Inc

    EIN 912039497 · Headquarters: Harrisonburg, VA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  59. Sigma Theta Tau International Inc

    EIN 912039498 · Headquarters: Carrollton, GA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  60. Sigma Theta Tau International Inc

    EIN 912039501 · Headquarters: EDINBURG, TX, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  61. Sigma Theta Tau International Inc

    EIN 912039503 · Headquarters: Quincy, IL, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  62. Sigma Theta Tau International Inc

    EIN 912039504 · Headquarters: California, PA, US · Unknown & Unclassified · Latest available filing year: 2019 · Primary form: IRS Form 990-N

  63. Sigma Theta Tau International Inc

    EIN 912039508 · Headquarters: Martin, TN, US · Unknown & Unclassified · Latest available filing year: 2019 · Primary form: IRS Form 990-N

  64. Sigma Theta Tau International Inc

    EIN 912039509 · Headquarters: La Crosse, WI, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  65. Sigma Theta Tau International Inc

    EIN 912039512 · Headquarters: Canton, OH, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  66. Sigma Theta Tau International Inc

    EIN 912039514 · Headquarters: Rochester, NY, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  67. Sigma Theta Tau International Inc

    EIN 912039522 · Headquarters: San Bernardino, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  68. Sigma Theta Tau International Inc

    EIN 912039525 · Headquarters: Elmira, NY, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  69. Sigma Theta Tau International Inc

    EIN 912039529 · Headquarters: Indianapolis, IN, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  70. Sigma Theta Tau International Inc

    EIN 912042582 · Headquarters: Independence, MO, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  71. Sigma Theta Tau International Inc

    EIN 916062245 · Headquarters: Poulsbo, WA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  72. Sigma Theta Tau International Inc

    EIN 930800164 · Headquarters: Muncie, IN, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  73. Sigma Theta Tau International Inc

    EIN 930800171 · Headquarters: Huntsville, AL, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  74. Sigma Theta Tau International Inc

    EIN 930800179 · Headquarters: Ewing, NJ, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  75. Sigma Theta Tau International Omega Iota Chapter 559

    EIN 371953166 · Headquarters: Russellville, AR, US · Unknown & Unclassified · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  76. Sigma Theta Tau International Xi Beta Chapter

    EIN 351928457 · Headquarters: East Stroudsburg, PA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  77. Sigma Thetq Tau Inc

    EIN 311309948 · Headquarters: Athens, OH, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  78. Sigma Upsilon Charity Inc

    EIN 383367026 · Headquarters: LANSING, MI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  79. Sigma Xi

    EIN 621731248 · Headquarters: Murfreesboro, TN, US · Unknown & Unclassified · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  80. Sigma Xi

    EIN 900343970 · Headquarters: Cookeville, TN, US · Unknown & Unclassified · Latest available filing year: 2014 · Primary form: IRS Form 990-N

  81. Sigma Xi Alpha Chapter

    EIN 364656079 · Headquarters: Ithaca, NY, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  82. Sigma Xi Chapter 699

    EIN 273265459 · Headquarters: Mobile, AL, US · Unknown & Unclassified · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  83. Sigma Xi Chapter Montana State University-bozeman

    EIN 260690000 · Headquarters: Bozeman, MT, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  84. Sigma Xi Chapter of University of Alabama at Birmingham

    EIN 800374024 · Headquarters: Birmingham, AL, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  85. Sigma Xi Chapter University of Southern Mississippi

    EIN 640695069 · Headquarters: Hattiesburg, MS, US · Unknown & Unclassified · Latest available filing year: 2007 · Primary form: IRS Form 990-N

  86. Sigma Xi Club of Rockford

    EIN 362935508 · Headquarters: Rockford, IL, US · Unknown & Unclassified · Latest available filing year: 2008 · Primary form: IRS Form 990-N

  87. Sigma Xi Kirksville Club

    EIN 431717417 · Headquarters: Kirksville, MO, US · Unknown & Unclassified · Latest available filing year: 2017 · Primary form: IRS Form 990-N

  88. Sigma Xi Newark Chapter

    EIN 223688339 · Headquarters: NEWARK, NJ, US · Unknown & Unclassified · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  89. Sigma Xi Saint Louis University Chapter

    EIN 943473116 · Headquarters: Saint Louis, MO, US · Unknown & Unclassified · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  90. Sigma Xi Scientific Research Society Cwru Chapter

    EIN 010901265 · Headquarters: Shaker Heights, OH, US · Unknown & Unclassified · Latest available filing year: 2014 · Primary form: IRS Form 990-N

  91. Sigma Xi Sosc

    EIN 931108666 · Headquarters: Ashland, OR, US · Unknown & Unclassified · Latest available filing year: 2012 · Primary form: IRS Form 990-N

  92. Sigma Xi Southern Illinois Chapter

    EIN 800405921 · Headquarters: Carbondale, IL, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  93. Sigma Xi the Scientific Research Society

    EIN 264462854 · Headquarters: OBERLIN, OH, US · Unknown & Unclassified · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  94. Sigma Xi the Scientific Research Society of North America-universit

    EIN 237272291 · Headquarters: Baldwin, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  95. Sigma Xi University of Minnesota at Dulth Chapter

    EIN 411729212 · Headquarters: Duluth, MN, US · Unknown & Unclassified · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  96. Sigma Xi University of Pittsburgh Chapter

    EIN 300592993 · Headquarters: Pittsburgh, PA, US · Unknown & Unclassified · Latest available filing year: 2012 · Primary form: IRS Form 990-N

  97. Sigma Xi, The Scientific Research Honor Society

    EIN 060655494 · Headquarters: Research Triangle Park, NC, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  98. Sigma Xi-lehman College Chapter

    EIN 800374129 · Headquarters: Broxn, NY, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  99. Sigma Xi-Mississippi State University Chapter

    EIN 274028220 · Headquarters: Mississippi State, MS, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  100. Sigma Xi-orange County Chapter

    EIN 262729368 · Headquarters: Fountain Valley, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

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