Nonprofits in Wisconsin

Nonprofits in Wisconsin. Browse 46,682 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. Side by Side Inc

    EIN 205405562 · Headquarters: LAKE GENEVA, WI, USA · Human Services · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  2. Side-out Club Inc

    EIN 454208263 · Headquarters: Oak Creek, WI, US · Recreation & Sports · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  3. Sidekick Education

    EIN 831877071 · Headquarters: Madison, WI, USA · Education · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  4. Siebecker Foundation Inc

    EIN 237417555 · Headquarters: WAUSAU, WI, USA · Unknown & Unclassified · Latest available filing year: 2022 · Primary form: IRS Form 990-PF

  5. Siebert Lutheran Foundation Inc

    EIN 396050046 · Headquarters: MILWAUKEE, WI, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-PF

  6. Sieg Foundation

    EIN 316665297 · Headquarters: MADISON, WI, USA · Education · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  7. Siena on the Lake Inc

    EIN 452814682 · Headquarters: RACINE, WI, USA · Housing & Shelter · Latest available filing year: 2024 · Primary form: IRS Form 990

  8. Siena Retreat Center Inc

    EIN 272468917 · Headquarters: RACINE, WI, USA · Education · Latest available filing year: 2024 · Primary form: IRS Form 990

  9. Sierra Delta Inc

    EIN 820989470 · Headquarters: REEDSBURG, WI, USA · Human Services · Latest available filing year: 2024 · Primary form: IRS Form 990

  10. Sierra Leone Association of Milwaukee

    EIN 831036910 · Headquarters: Milwaukee, WI, USA · Arts, Culture & Humanities · Latest available filing year: 2025 · Primary form: IRS Form 990-PF

  11. Sierra Leone Research and Development Institute Inc

    EIN 333000678 · Headquarters: MIDDLETON, WI, US · International, Foreign Affairs & National Security · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  12. Sifting & Winnowing Foundation Inc

    EIN 831208686 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  13. Siggys Musical Garden Incorporated

    EIN 833921063 · Headquarters: Superior, WI, US · Arts, Culture & Humanities · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  14. Sigma Alpha Epsilon Corporation

    EIN 396053042 · Headquarters: Madison, WI, USA · Education · Latest available filing year: 2016 · Primary form: IRS Form 990

  15. Sigma Alpha Mu Fraternity

    EIN 391605964 · Headquarters: Madison, WI, US · Education · Latest available filing year: 2015 · Primary form: IRS Form 990-N

  16. Sigma Alpha Omega Christian Sorority Inc

    EIN 821169268 · Headquarters: MADISON, WI, US · Education · Latest available filing year: 2021 · Primary form: IRS Form 990-N

  17. Sigma Alpha Sorority

    EIN 010974662 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  18. Sigma Alpha Sorority

    EIN 263626778 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  19. Sigma Alpha Sorority

    EIN 271343698 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  20. Sigma Alpha Sorority

    EIN 272226373 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  21. Sigma Alpha Sorority

    EIN 272245910 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  22. Sigma Alpha Sorority

    EIN 274287408 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  23. Sigma Alpha Sorority

    EIN 274349977 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  24. Sigma Alpha Sorority

    EIN 274357673 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  25. Sigma Alpha Sorority

    EIN 300603865 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  26. Sigma Alpha Sorority

    EIN 300708124 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  27. Sigma Alpha Sorority

    EIN 300825198 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  28. Sigma Alpha Sorority

    EIN 352013236 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  29. Sigma Alpha Sorority

    EIN 352356372 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  30. Sigma Alpha Sorority

    EIN 364742714 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  31. Sigma Alpha Sorority

    EIN 383833243 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  32. Sigma Alpha Sorority

    EIN 450649782 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  33. Sigma Alpha Sorority

    EIN 454195287 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  34. Sigma Alpha Sorority

    EIN 454248463 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  35. Sigma Alpha Sorority

    EIN 464361428 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  36. Sigma Alpha Sorority

    EIN 465690661 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  37. Sigma Alpha Sorority

    EIN 471957334 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  38. Sigma Alpha Sorority

    EIN 472126506 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  39. Sigma Alpha Sorority

    EIN 472305039 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  40. Sigma Alpha Sorority

    EIN 472565264 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  41. Sigma Alpha Sorority

    EIN 472606674 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  42. Sigma Alpha Sorority

    EIN 474479653 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  43. Sigma Alpha Sorority

    EIN 475043772 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  44. Sigma Alpha Sorority

    EIN 570961605 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  45. Sigma Alpha Sorority

    EIN 611613052 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  46. Sigma Alpha Sorority

    EIN 800338538 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  47. Sigma Alpha Sorority

    EIN 800518879 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  48. Sigma Alpha Sorority

    EIN 800555774 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  49. Sigma Alpha Sorority

    EIN 800677619 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  50. Sigma Alpha Sorority

    EIN 811255969 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  51. Sigma Alpha Sorority

    EIN 811256224 · Headquarters: MUSKEGO, WI, US · Education · Latest available filing year: 2014 · Primary form: IRS Form 990-N

  52. Sigma Alpha Sorority

    EIN 811267926 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  53. Sigma Alpha Sorority

    EIN 811268641 · Headquarters: MUSKEGO, WI, US · Education · Latest available filing year: 2014 · Primary form: IRS Form 990-N

  54. Sigma Alpha Sorority

    EIN 811661431 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  55. Sigma Alpha Sorority

    EIN 813029752 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  56. Sigma Alpha Sorority

    EIN 813047256 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  57. Sigma Alpha Sorority

    EIN 813065100 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  58. Sigma Alpha Sorority

    EIN 813075987 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  59. Sigma Alpha Sorority

    EIN 813097782 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  60. Sigma Alpha Sorority

    EIN 814558121 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  61. Sigma Alpha Sorority

    EIN 814570353 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  62. Sigma Alpha Sorority

    EIN 821300326 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  63. Sigma Alpha Sorority

    EIN 821393002 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  64. Sigma Alpha Sorority

    EIN 821393061 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  65. Sigma Alpha Sorority

    EIN 900527355 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  66. Sigma Alpha Sorority

    EIN 900734861 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  67. Sigma Alpha Sorority

    EIN 943480647 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  68. Sigma Chi Fraternity

    EIN 390803127 · Headquarters: MADISON, WI, US · Education · Latest available filing year: 2018 · Primary form: IRS Form 990-N

  69. Sigma Chi Fraternity

    EIN 390972993 · Headquarters: Beloit, WI, US · Unknown & Unclassified · Latest available filing year: 2019 · Primary form: IRS Form 990-N

  70. Sigma Chi Fraternity Epsilon Lambda

    EIN 396077257 · Headquarters: RIPON, WI, US · Mutual & Membership Benefit · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  71. Sigma Chi Rho

    EIN 611559253 · Headquarters: Milwaukee, WI, US · Recreation & Sports · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  72. Sigma Delta Epsilon Graduate Women in Science Inc

    EIN 396077394 · Headquarters: Madison, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  73. Sigma Delta Tau - Alpha Nu Chapter

    EIN 920241656 · Headquarters: Madison, WI, USA · Education · Latest available filing year: 2024 · Primary form: IRS Form 990

  74. Sigma Gamma Epsilon

    EIN 742797587 · Headquarters: Oshkosh, WI, US · Education · Latest available filing year: 2008 · Primary form: IRS Form 990-N

  75. Sigma Gamma Rho Sorority Inc

    EIN 396020472 · Headquarters: MILWAUKEE, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  76. Sigma Gamma Rho Sorority Inc

    EIN 911836053 · Headquarters: WHITEWATER, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  77. Sigma Gamma Rho Sorority Inc

    EIN 930813688 · Headquarters: MILWAUKEE, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  78. Sigma Gamma Rho Sorority Inc - Theta Zeta

    EIN 800436960 · Headquarters: MILWAUKEE, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  79. Sigma Gamma Rho Sorority Inc Epsilon Xi Chapter Madison Wi

    EIN 930813691 · Headquarters: Milwaukee, WI, US · Education · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  80. Sigma Legacy Fund

    EIN 311746274 · Headquarters: MILWAUKEE, WI, US · Recreation & Sports · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  81. Sigma Phi Alpha Dental Hygiene Honor Society

    EIN 260185712 · Headquarters: Waukesha, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  82. Sigma Phi Alpha Dental Hygiene Honor Society

    EIN 391694866 · Headquarters: Wausau, WI, US · Education · Latest available filing year: 2007 · Primary form: IRS Form 990-N

  83. Sigma Phi Alpha Dental Hygiene Honor Society

    EIN 391701373 · Headquarters: Green Bay, WI, US · Education · Latest available filing year: 2007 · Primary form: IRS Form 990-N

  84. Sigma Phi Alpha Dental Hygiene Honor Society

    EIN 911895673 · Headquarters: RACINE, WI, US · Education · Latest available filing year: 2013 · Primary form: IRS Form 990-N

  85. Sigma Phi Epsilon Fraternity Inc

    EIN 390975684 · Headquarters: MADISON, WI, US · Education · Latest available filing year: 2017 · Primary form: IRS Form 990-N

  86. Sigma Phi Epsilon Fraternity Inc

    EIN 391651726 · Headquarters: Waterford, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  87. Sigma Phi Epsilon Fraternity Inc

    EIN 911822000 · Headquarters: Platteville, WI, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  88. Sigma Phi Epsilon Fraternity Inc

    EIN 943178369 · Headquarters: Appleton, WI, US · Education · Latest available filing year: 2008 · Primary form: IRS Form 990-N

  89. Sigma Pi Fraternity International

    EIN 396100409 · Headquarters: OSHKOSH, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  90. Sigma Pi Fraternity International Inc

    EIN 237127775 · Headquarters: Platteville, WI, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  91. Sigma Pi Fraternity International Inc

    EIN 260060210 · Headquarters: Madison, WI, US · Education · Latest available filing year: 2008 · Primary form: IRS Form 990-N

  92. Sigma Pi Fraternity International Inc

    EIN 800358763 · Headquarters: Madison, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  93. Sigma Psi Zeta Sorority Inc - Alpha Pi

    EIN 841797685 · Headquarters: Madison, WI, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  94. Sigma Sigma Sigma Inc

    EIN 463903024 · Headquarters: Greenville, WI, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  95. Sigma Sigma Sigma Inc

    EIN 475510405 · Headquarters: New Berlin, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  96. Sigma Sigma Sigma Madison Area Alumnae Chapter

    EIN 264593474 · Headquarters: Janesville, WI, US · Unknown & Unclassified · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  97. Sigma State Foundation Inc

    EIN 391960372 · Headquarters: Milwaukee, WI, US · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  98. Sigma Tau Gamma Fraternity D/b/a Eta Nu

    EIN 842623136 · Headquarters: MADISON, WI, US · Unknown & Unclassified · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  99. Sigma Theta Tau Inc

    EIN 237243779 · Headquarters: Madison, WI, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  100. Sigma Theta Tau Inc

    EIN 311246730 · Headquarters: Green Bay, WI, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

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