Unknown & Unclassified nonprofits in Wisconsin

Unknown & Unclassified nonprofits in Wisconsin. Browse 13,737 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. Optimist International

    EIN 900054196 · Headquarters: Monroe, WI, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  2. Optimist International

    EIN 900284089 · Headquarters: Mosinee, WI, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  3. Optimist International

    EIN 900287295 · Headquarters: Fennimore, WI, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  4. Optimist International

    EIN 900528724 · Headquarters: COTTAGE GROVE, WI, US · Unknown & Unclassified · Latest available filing year: 2020 · Primary form: IRS Form 990-N

  5. Optimist International

    EIN 900577248 · Headquarters: Muskego, WI, US · Unknown & Unclassified · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  6. Optimist International

    EIN 911889288 · Headquarters: Arena, WI, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  7. Optimist International

    EIN 930819912 · Headquarters: beaver dam, WI, US · Unknown & Unclassified · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  8. Optimist International

    EIN 930819913 · Headquarters: Kewaunee, WI, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  9. Optimist International

    EIN 930819922 · Headquarters: Chilton, WI, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  10. Optimist International

    EIN 931544322 · Headquarters: Waterford, WI, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  11. Optimist International 09205 OC of Wausau WI

    EIN 396080002 · Headquarters: Wausau, WI, USA · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990

  12. Optimist International 23158 Everest Area WI

    EIN 237176955 · Headquarters: Schofield, WI, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  13. Options Fund

    EIN 391989709 · Headquarters: EAU CLAIRE, WI, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  14. Options in Community Living Inc

    EIN 391373054 · Headquarters: MADISON, WI, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  15. Options on 8

    EIN 391537061 · Headquarters: St Croix Falls, WI, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  16. Oran Mcshan Grand Lodge

    EIN 473740592 · Headquarters: Milwaukee, WI, US · Unknown & Unclassified · Latest available filing year: 2015 · Primary form: IRS Form 990-N

  17. Orchard Valley Apartments Inc

    EIN 391338423 · Headquarters: OSHKOSH, WI, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  18. Orchid Growers Guild Inc

    EIN 391546732 · Headquarters: Madison, WI, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  19. Order of Eastern Star of the State of Wisconsin

    EIN 237534363 · Headquarters: Ellsworth, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  20. Order of St Camillus Foundation Inc

    EIN 391925879 · Headquarters: WAUWATOSA, WI, USA · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990

  21. Order of the Amaranth Inc

    EIN 391427642 · Headquarters: Plymouth, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  22. Order of the Amaranth Inc Supreme C Ouncil

    EIN 237614588 · Headquarters: BROOKFIELD, WI, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  23. Order of the Amaranth Inc Supreme Council

    EIN 237614592 · Headquarters: Union Grove, WI, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  24. Order of the Amaranth Inc Supreme Council

    EIN 237614593 · Headquarters: Madison, WI, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  25. Order of the Amaranth Inc Supreme Council

    EIN 396058537 · Headquarters: Kaukauna, WI, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  26. Order of the Eastern Star of Minnesota

    EIN 416056466 · Headquarters: AMERY, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  27. Order of the Eastern Star of the State of Wisconsin

    EIN 237534260 · Headquarters: Kewaunee, WI, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  28. Order of the Eastern Star of the State of Wisconsin

    EIN 237534274 · Headquarters: Sparta, WI, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  29. Order of the Eastern Star of the State of Wisconsin

    EIN 237534279 · Headquarters: La Crosse, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  30. Order of the Eastern Star of the State of Wisconsin

    EIN 237534285 · Headquarters: PLATTEVILLE, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  31. Order of the Eastern Star of the State of Wisconsin

    EIN 237534289 · Headquarters: Westby, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  32. Order of the Eastern Star of the State of Wisconsin

    EIN 237534291 · Headquarters: New Richmond, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  33. Order of the Eastern Star of the State of Wisconsin

    EIN 237534292 · Headquarters: MINERAL POINT, WI, US · Unknown & Unclassified · Latest available filing year: 2021 · Primary form: IRS Form 990-N

  34. Order of the Eastern Star of the State of Wisconsin

    EIN 237534293 · Headquarters: Mukwonago, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  35. Order of the Eastern Star of the State of Wisconsin

    EIN 237534300 · Headquarters: Stoughton, WI, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  36. Order of the Eastern Star of the State of Wisconsin

    EIN 237534318 · Headquarters: Janesville, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  37. Order of the Eastern Star of the State of Wisconsin

    EIN 237534320 · Headquarters: Union Grove, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  38. Order of the Eastern Star of the State of Wisconsin

    EIN 237534328 · Headquarters: River Falls, WI, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  39. Order of the Eastern Star of the State of Wisconsin

    EIN 237534335 · Headquarters: Wisconsin Rapids, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  40. Order of the Eastern Star of the State of Wisconsin

    EIN 237534340 · Headquarters: KENOSHA, WI, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  41. Order of the Eastern Star of the State of Wisconsin

    EIN 237534342 · Headquarters: Appleton, WI, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  42. Order of the Eastern Star of the State of Wisconsin

    EIN 237534343 · Headquarters: Marshfield, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  43. Order of the Eastern Star of the State of Wisconsin

    EIN 237534346 · Headquarters: Star Prairie, WI, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  44. Order of the Eastern Star of the State of Wisconsin

    EIN 237534361 · Headquarters: Mineral Point, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  45. Order of the Eastern Star of the State of Wisconsin

    EIN 237534364 · Headquarters: Plymouth, WI, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  46. Order of the Eastern Star of the State of Wisconsin

    EIN 237534366 · Headquarters: Wisconsin Dells, WI, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  47. Order of the Eastern Star of the State of Wisconsin

    EIN 237534388 · Headquarters: Port Washington, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  48. Order of the Eastern Star of the State of Wisconsin

    EIN 237534391 · Headquarters: Lodi, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  49. Order of the Eastern Star of the State of Wisconsin

    EIN 237534398 · Headquarters: Elroy, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  50. Order of the Eastern Star of the State of Wisconsin

    EIN 237534425 · Headquarters: Wauwatosa, WI, US · Unknown & Unclassified · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  51. Order of the Eastern Star of the State of Wisconsin

    EIN 237534428 · Headquarters: Wautoma, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  52. Order of the Eastern Star of the State of Wisconsin

    EIN 237534445 · Headquarters: Arbor Vitae, WI, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  53. Order of the Eastern Star of the State of Wisconsin

    EIN 237534446 · Headquarters: Brookfield, WI, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  54. Order of the Eastern Star of the State of Wisconsin

    EIN 237534472 · Headquarters: OCONOMOWOC, WI, US · Unknown & Unclassified · Latest available filing year: 2021 · Primary form: IRS Form 990-N

  55. Order of the Eastern Star of the State of Wisconsin

    EIN 237534492 · Headquarters: Madison, WI, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  56. Order of the Eastern Star of the State of Wisconsin

    EIN 390518864 · Headquarters: Milwaukee, WI, US · Unknown & Unclassified · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  57. Order of the Eastern Star of the State of Wisconsin

    EIN 390518891 · Headquarters: New Berlin, WI, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  58. Order of the Eastern Star of the State of Wisconsin

    EIN 391275488 · Headquarters: Burlington, WI, US · Unknown & Unclassified · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  59. Order of the White Shrine of Jerusalem

    EIN 237514473 · Headquarters: Appleton, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  60. Order of the White Shrine of Jerusalem

    EIN 237514484 · Headquarters: Sparta, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  61. Oregon Anesthesiology & Research Society

    EIN 510151916 · Headquarters: MILWAUKEE, WI, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  62. Oregon Area Chamber of Commerce Inc

    EIN 391041919 · Headquarters: OREGON, WI, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  63. Oregon Area Council on Aging

    EIN 391485278 · Headquarters: Oregon, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  64. Oregon Area Historical Society Inc

    EIN 391637046 · Headquarters: OREGON, WI, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  65. Oregon Daycare Inc

    EIN 391649511 · Headquarters: Oregon, WI, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  66. Oregon Education Association

    EIN 237068532 · Headquarters: MADISON, WI, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  67. Oregon Lego 4-H Club

    EIN 923457804 · Headquarters: Madison, WI, US · Unknown & Unclassified · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  68. Oregon Rotary Foundation

    EIN 391563000 · Headquarters: Oregon, WI, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-PF

  69. Oregon Sno-blazers Inc

    EIN 237097024 · Headquarters: Oregon, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  70. Oregon Straw Hat Players Inc

    EIN 391499819 · Headquarters: Oregon, WI, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  71. Oregon Wisconsin Area Homeschoolers Inc

    EIN 822448543 · Headquarters: Albany, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  72. Oregon Youth Baseball Inc

    EIN 391780517 · Headquarters: Oregon, WI, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  73. Organic Arts Ltd

    EIN 201372895 · Headquarters: MILWAUKEE, WI, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  74. Organization of Chinese Americans- Wisconsin Chapter Inc

    EIN 521306701 · Headquarters: WAUKESHA, WI, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  75. Organization Services Inc

    EIN 391034026 · Headquarters: MADISON, WI, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  76. Orthodontic Manufacturers Assc Inc

    EIN 391608032 · Headquarters: Sheboygan, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  77. Oscar & Augusta Schlegel Fdn

    EIN 391586544 · Headquarters: MILWAUKEE, WI, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-PF

  78. Osceola Area Chamber of Commerce In

    EIN 391939758 · Headquarters: OSCEOLA, WI, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  79. Oshkosh Area Economic Development Corporation

    EIN 391622920 · Headquarters: OSHKOSH, WI, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  80. Oshkosh Area United Way Inc

    EIN 391017908 · Headquarters: OSHKOSH, WI, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  81. Oshkosh Area Womens Alliance

    EIN 274548869 · Headquarters: Omro, WI, US · Unknown & Unclassified · Latest available filing year: 2011 · Primary form: IRS Form 990-N

  82. Oshkosh Area Womens Association Inc

    EIN 391857259 · Headquarters: OSHKOSH, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  83. Oshkosh Chamber of Commerce

    EIN 930765817 · Headquarters: OSHKOSH, WI, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  84. Oshkosh Chamber Singers Incorporated

    EIN 391590753 · Headquarters: Oshkosh, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  85. Oshkosh Comm Ymca Unrestricted

    EIN 396084455 · Headquarters: MILWAUKEE, WI, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-PF

  86. Oshkosh Convention & Visitors Bureau Inc

    EIN 391845587 · Headquarters: OSHKOSH, WI, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  87. Oshkosh Corporation Foundation Inc

    EIN 396062129 · Headquarters: Oshkosh, WI, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-PF

  88. Oshkosh Education Association

    EIN 237083797 · Headquarters: MADISON, WI, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  89. Oshkosh Fine Arts Association Inc

    EIN 391230713 · Headquarters: Oshkosh, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  90. Oshkosh Gun Club Inc

    EIN 396088383 · Headquarters: Oshkosh, WI, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  91. Oshkosh Ice Hawks Hockey Boosters Inc

    EIN 850949844 · Headquarters: Oshkosh, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  92. Oshkosh Kennel Club Inc

    EIN 396078547 · Headquarters: OSHKOSH, WI, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  93. Oshkosh on the Water

    EIN 391709055 · Headquarters: Oshkosh, WI, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  94. Oshkosh Paraprofessional Education Association

    EIN 391493600 · Headquarters: MADISON, WI, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  95. Oshkosh Philatelic Society

    EIN 364798592 · Headquarters: Kimberly, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  96. Oshkosh Power Boat Club

    EIN 390981448 · Headquarters: Oshkosh, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  97. Oshkosh Sawdust Days Inc

    EIN 391196423 · Headquarters: Oshkosh, WI, US · Unknown & Unclassified · Latest available filing year: 2020 · Primary form: IRS Form 990-N

  98. Oshkosh Senior Softball

    EIN 391736491 · Headquarters: Oshkosh, WI, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  99. Oshkosh Ultralight Flyers Inc

    EIN 391651372 · Headquarters: WINNECONNE, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  100. Oshkosh Yacht Club Inc

    EIN 391524317 · Headquarters: Oshkosh, WI, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

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