Nonprofits in Stillwater, Oklahoma

Nonprofits in Stillwater, Oklahoma. Browse 1,006 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. Kappa Kappa Psi Honorary Band Fraternity

    EIN 900330942 · Headquarters: Stillwater, OK, US · Arts, Culture & Humanities · Latest available filing year: 2018 · Primary form: IRS Form 990-N

  2. Kappa Kappa Psi Honorary Band Fraternity

    EIN 900683362 · Headquarters: Stillwater, OK, US · Arts, Culture & Humanities · Latest available filing year: 2018 · Primary form: IRS Form 990-N

  3. Kappa Kappa Psi-xi Mu

    EIN 320832705 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  4. Kentucky Auctioneers Association Inc

    EIN 621353007 · Headquarters: STILLWATER, OK, USA · Community Improvement & Capacity Building · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  5. Kickin Childhood Hunger Inc

    EIN 471867272 · Headquarters: STILLWATER, OK, USA · Human Services · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  6. Kiwanis International

    EIN 730941992 · Headquarters: Stillwater, OK, US · Community Improvement & Capacity Building · Latest available filing year: 2012 · Primary form: IRS Form 990-N

  7. Kiwanis International Inc

    EIN 510178796 · Headquarters: Stillwater, OK, US · Community Improvement & Capacity Building · Latest available filing year: 2018 · Primary form: IRS Form 990-N

  8. Kiwanis International Inc

    EIN 731272929 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  9. Knights of Cloumbus

    EIN 237221889 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2018 · Primary form: IRS Form 990-N

  10. Knights of Columbus

    EIN 262985609 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  11. Knights of Columbus

    EIN 731435646 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  12. Knights of Columbus

    EIN 736109133 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  13. Knights Templar of the United States of America

    EIN 237136537 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  14. Lake McMurtry Friends Inc

    EIN 455191283 · Headquarters: Stillwater, OK, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  15. Langston Development Fund Inc

    EIN 731476426 · Headquarters: STILLWATER, OK, US · Education · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  16. LC Ministries Inc

    EIN 452444303 · Headquarters: Stillwater, OK, US · Religion Related · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  17. League of Women Voters Stillwater Oklahoma

    EIN 800640023 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  18. Lincoln University of Pennsylvania Alumni Association of Kappa Kappa

    EIN 993130607 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  19. Linehan Family Foundation

    EIN 731602044 · Headquarters: STILLWATER, OK, USA · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2024 · Primary form: IRS Form 990-PF

  20. Little Ripple Design Study Foundation

    EIN 043622084 · Headquarters: Stillwater, OK, US · International, Foreign Affairs & National Security · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  21. Living Improvement for the Elderly Center

    EIN 731184845 · Headquarters: STILLWATER, OK, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  22. Lost & Found International Inc

    EIN 030470429 · Headquarters: STILLWATER, OK, USA · International, Foreign Affairs & National Security · Latest available filing year: 2024 · Primary form: IRS Form 990

  23. Martin Entertainment Inc

    EIN 825110084 · Headquarters: Stillwater, OK, US · Public & Societal Benefit · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  24. Materials Research Foundation

    EIN 431705803 · Headquarters: Stillwater, OK, US · Science & Technology · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  25. Matthew 2540 Mission Inc

    EIN 113643437 · Headquarters: STILLWATER, OK, USA · Environment · Latest available filing year: 2023 · Primary form: IRS Form 990-EZ

  26. Matthias Ministries Inc

    EIN 731610580 · Headquarters: Stillwater, OK, US · Religion Related · Latest available filing year: 2018 · Primary form: IRS Form 990-N

  27. Meridian Technology Center Foundation Inc

    EIN 731257840 · Headquarters: STILLWATER, OK, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  28. Midwest Art History Society Inc

    EIN 237414914 · Headquarters: Stillwater, OK, US · Arts, Culture & Humanities · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  29. Milton L Highberger Memorial Foundation

    EIN 261767849 · Headquarters: STILLWATER, OK, USA · Education · Latest available filing year: 2022 · Primary form: IRS Form 990-PF

  30. Minnesota State Auctioneers

    EIN 411391778 · Headquarters: STILLWATER, OK, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  31. Minnesota State Auctioneers Found

    EIN 263754367 · Headquarters: STILLWATER, OK, USA · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  32. Moms Club

    EIN 300728402 · Headquarters: Stillwater, OK, US · Human Services · Latest available filing year: 2015 · Primary form: IRS Form 990-N

  33. MPower Inc

    EIN 730799560 · Headquarters: Stillwater, OK, USA · Employment · Latest available filing year: 2024 · Primary form: IRS Form 990

  34. My Fathers House Childrens Foundation

    EIN 813675198 · Headquarters: Stillwater, OK, US · Human Services · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  35. Myas Promise Inc

    EIN 204375990 · Headquarters: Stillwater, OK, US · Human Services · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  36. National Active and Retired Federal Employees Association

    EIN 736102677 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  37. National Agricultural Communicators of Tomorrow

    EIN 481186031 · Headquarters: Stillwater, OK, US · Education · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  38. National Air Traffic Controllers Association

    EIN 262496628 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  39. National Association of Extension Program and Staff Development Prof

    EIN 371603989 · Headquarters: STILLWATER, OK, USA · Education · Latest available filing year: 2025 · Primary form: IRS Form 990-PF

  40. National Association of Government Guaranteed Lenders Inc

    EIN 942994010 · Headquarters: STILLWATER, OK, USA · Public & Societal Benefit · Latest available filing year: 2017 · Primary form: IRS Form 990

  41. National Association of Letter Carriers

    EIN 736102589 · Headquarters: STILLWATER, OK, US · Employment · Latest available filing year: 2007 · Primary form: IRS Form 990-N

  42. National Council of Teachers of English

    EIN 300868990 · Headquarters: Stillwater, OK, US · Arts, Culture & Humanities · Latest available filing year: 2018 · Primary form: IRS Form 990-N

  43. National Exchange Club

    EIN 237107052 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2019 · Primary form: IRS Form 990-N

  44. National Headquarters of the National Society of Scabbard and B

    EIN 350991684 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  45. National Kappa Kappa Iota Inc

    EIN 731202835 · Headquarters: Stillwater, OK, US · Education · Latest available filing year: 2007 · Primary form: IRS Form 990-N

  46. National Society Daughters of the Union 1861-1865 Inc

    EIN 911999210 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  47. National Society of the Daughters of the American Revolution

    EIN 736102349 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  48. National Wrestling Hall of Fame

    EIN 237233488 · Headquarters: STILLWATER, OK, USA · Arts, Culture & Humanities · Latest available filing year: 2024 · Primary form: IRS Form 990

  49. Natures Vein Wildlife Rescue

    EIN 814763610 · Headquarters: Stillwater, OK, US · Animal Related · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  50. Nesi-ses Association

    EIN 463845407 · Headquarters: STILLWATER, OK, US · Unknown & Unclassified · Latest available filing year: 2020 · Primary form: IRS Form 990-N

  51. New and Related Services Division of Oklahoma Association for Career

    EIN 731215983 · Headquarters: Stillwater, OK, US · Community Improvement & Capacity Building · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  52. New York State Auctioneers Association Inc

    EIN 223256831 · Headquarters: STILLWATER, OK, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  53. North American for Seventeeth Century French Literature

    EIN 731448829 · Headquarters: Stillwater, OK, US · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2021 · Primary form: IRS Form 990-N

  54. North Central Square Dance Association

    EIN 731352264 · Headquarters: Stillwater, OK, US · Arts, Culture & Humanities · Latest available filing year: 2010 · Primary form: IRS Form 990-N

  55. Nottingham Homeowners Association Inc

    EIN 731269497 · Headquarters: Stillwater, OK, US · Housing & Shelter · Latest available filing year: 2010 · Primary form: IRS Form 990-N

  56. Nu Mu Alumni Association of Kappa Kappa Psi

    EIN 990428853 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  57. Nu Omicron Alumni Association of Kappa Kappa Psi

    EIN 923803730 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  58. Oak Growe Cemetery

    EIN 731129287 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  59. Ok Alumni Association of Alpha Gamma Rho

    EIN 736104140 · Headquarters: Stillwater, OK, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  60. Ok Steele

    EIN 474862396 · Headquarters: Stillwater, OK, US · Recreation & Sports · Latest available filing year: 2018 · Primary form: IRS Form 990-N

  61. Okla Association of Career & Technology Education Guidance Div

    EIN 300152896 · Headquarters: Stillwater, OK, US · Community Improvement & Capacity Building · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  62. Oklahoma 4-H Foundation Inc

    EIN 736109761 · Headquarters: STILLWATER, OK, USA · Youth Development · Latest available filing year: 2024 · Primary form: IRS Form 990

  63. Oklahoma Assistive Technology Foundation

    EIN 731611118 · Headquarters: STILLWATER, OK, USA · Human Services · Latest available filing year: 2024 · Primary form: IRS Form 990

  64. Oklahoma Assoc of Career & Tech Ed Business & Info Tech Education

    EIN 731549926 · Headquarters: Stillwater, OK, US · Education · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  65. Oklahoma Assoc of Family Career & Commun

    EIN 510143812 · Headquarters: STILLWATER, OK, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  66. Oklahoma Association for Institutio Nal Research

    EIN 731386077 · Headquarters: Stillwater, OK, US · Education · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  67. Oklahoma Association of Government Guaranteed Lenders

    EIN 461736553 · Headquarters: STILLWATER, OK, USA · Community Improvement & Capacity Building · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  68. Oklahoma Beef Inc

    EIN 237331263 · Headquarters: STILLWATER, OK, US · Employment · Latest available filing year: 2015 · Primary form: IRS Form 990-N

  69. Oklahoma Beta Building Association of Phi Delta Theta

    EIN 237221477 · Headquarters: Stillwater, OK, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  70. Oklahoma Beta of Pi Beta Phi Inc

    EIN 736102709 · Headquarters: STILLWATER, OK, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  71. Oklahoma Bicycling Coalition

    EIN 208391423 · Headquarters: Stillwater, OK, US · Recreation & Sports · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  72. Oklahoma Bicycling Education Fund

    EIN 203383842 · Headquarters: STILLWATER, OK, US · Education · Latest available filing year: 2012 · Primary form: IRS Form 990-N

  73. Oklahoma Bike Summit Inc

    EIN 462866457 · Headquarters: Stillwater, OK, US · Recreation & Sports · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  74. Oklahoma Career and Technical Education Equity Council Inc

    EIN 510165215 · Headquarters: Stillwater, OK, US · Education · Latest available filing year: 2012 · Primary form: IRS Form 990-N

  75. Oklahoma Conservation Congress Oklahoma Chapter

    EIN 731150552 · Headquarters: Stillwater, OK, US · Environment · Latest available filing year: 2007 · Primary form: IRS Form 990-N

  76. Oklahoma Crop Improvement Association

    EIN 730592606 · Headquarters: STILLWATER, OK, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  77. Oklahoma Egg Council Incorporated

    EIN 237083686 · Headquarters: Stillwater, OK, US · Community Improvement & Capacity Building · Latest available filing year: 2008 · Primary form: IRS Form 990-N

  78. Oklahoma Extension Association of Family & Consumer Sciences

    EIN 730797819 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  79. Oklahoma Farm Bureau Payne County

    EIN 730678743 · Headquarters: Stillwater, OK, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  80. Oklahoma FarmHouse Corporation

    EIN 237390381 · Headquarters: Stillwater, OK, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  81. Oklahoma FCCLA Alumni & Associates

    EIN 731556655 · Headquarters: Stillwater, OK, USA · Youth Development · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  82. Oklahoma Foundation for Career and Tech Ed Inc

    EIN 237085697 · Headquarters: STILLWATER, OK, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  83. Oklahoma Future Farmers of America Foundation Incorporated

    EIN 731283413 · Headquarters: Stillwater, OK, USA · Food, Agriculture & Nutrition · Latest available filing year: 2024 · Primary form: IRS Form 990

  84. Oklahoma Genetics Inc

    EIN 731728055 · Headquarters: STILLWATER, OK, USA · Food, Agriculture & Nutrition · Latest available filing year: 2025 · Primary form: IRS Form 990

  85. Oklahoma Health Occupation Education Teachers

    EIN 731354085 · Headquarters: STILLWATER, OK, USA · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-EZ

  86. Oklahoma Home and Community Education Inc

    EIN 262267856 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  87. Oklahoma Home and Community Education Inc

    EIN 262549376 · Headquarters: STILLWATER, OK, US · Community Improvement & Capacity Building · Latest available filing year: 2008 · Primary form: IRS Form 990-N

  88. Oklahoma Home and Community Education Inc

    EIN 262549621 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  89. Oklahoma Home and Community Education Inc

    EIN 262549664 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  90. Oklahoma Home and Community Education Inc

    EIN 262549794 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  91. Oklahoma Home and Community Education Inc

    EIN 262549895 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  92. Oklahoma Home and Community Education Inc

    EIN 262549926 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  93. Oklahoma Home and Community Education Inc

    EIN 262549957 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  94. Oklahoma Home and Community Education Inc

    EIN 736113840 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  95. Oklahoma Lactation Consultant Association

    EIN 863573837 · Headquarters: STILLWATER, OK, US · Human Services · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  96. Oklahoma Lions Boys Ranch Inc Dba Lions Meadows of Hope

    EIN 730667540 · Headquarters: STILLWATER, OK, USA · Human Services · Latest available filing year: 2024 · Primary form: IRS Form 990

  97. Oklahoma Mortgage Bankers Association

    EIN 731239794 · Headquarters: STILLWATER, OK, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  98. Oklahoma Mu Alumni Corporation

    EIN 736102125 · Headquarters: STILLWATER, OK, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  99. Oklahoma Predictive Maintenance

    EIN 731413933 · Headquarters: STILLWATER, OK, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  100. Oklahoma Prescribed Burn Association

    EIN 460663267 · Headquarters: Stillwater, OK, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

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