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. Oklahoma Rural Rehabilitation Corp

    EIN 730769502 · Headquarters: STILLWATER, OK, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  2. Oklahoma Science Teachers Association

    EIN 731032045 · Headquarters: Stillwater, OK, US · Education · Latest available filing year: 2017 · Primary form: IRS Form 990-N

  3. Oklahoma Science Technology Engineering Math Association

    EIN 800905604 · Headquarters: Stillwater, OK, US · Community Improvement & Capacity Building · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  4. Oklahoma Section Institute of Food Technologies

    EIN 611925197 · Headquarters: Stillwater, OK, US · Food, Agriculture & Nutrition · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  5. Oklahoma Section Society for Range Management

    EIN 731405121 · Headquarters: Stillwater, OK, US · Education · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  6. Oklahoma State Auctioneers Association

    EIN 371573208 · Headquarters: STILLWATER, OK, USA · Recreation & Sports · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  7. Oklahoma State Organization Intl Good Sam Recreational Vehicle Club

    EIN 731389015 · Headquarters: Stillwater, OK, US · Recreation & Sports · Latest available filing year: 2008 · Primary form: IRS Form 990-N

  8. Oklahoma State University Agronomy Club

    EIN 364870113 · Headquarters: Stillwater, OK, US · Education · Latest available filing year: 2019 · Primary form: IRS Form 990-N

  9. Oklahoma State University Alumni Association

    EIN 731020684 · Headquarters: STILLWATER, OK, USA · Education · Latest available filing year: 2024 · Primary form: IRS Form 990

  10. Oklahoma State University Emeriti Association

    EIN 731586108 · Headquarters: Stillwater, OK, US · Education · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  11. Oklahoma State University Foundation

    EIN 736097060 · Headquarters: Stillwater, OK, US · Education · Latest available filing year: 2024 · Primary form: IRS Form 990

  12. Oklahoma State University Rodeo Association Booster Club

    EIN 731560709 · Headquarters: Stillwater, OK, US · Recreation & Sports · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  13. Oklahoma Swarm Softball Association

    EIN 474801088 · Headquarters: STILLWATER, OK, US · Recreation & Sports · Latest available filing year: 2017 · Primary form: IRS Form 990-N

  14. Oklahoma Texas Longhorn Association

    EIN 731277378 · Headquarters: Stillwater, OK, US · Animal Related · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  15. Oklahoma Turfgrass Research Foundation Inc

    EIN 736103397 · Headquarters: STILLWATER, OK, USA · Food, Agriculture & Nutrition · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  16. Oklahoma Vocational Ag Teacher's Association

    EIN 731172026 · Headquarters: STILLWATER, OK, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  17. Oklahoma Voluntary Organizations Active in Disaster

    EIN 262497429 · Headquarters: Stillwater, OK, US · Public Safety, Disaster Preparedness & Relief · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  18. Oklahoma WONDERtorium Ltd

    EIN 731610689 · Headquarters: Stillwater, OK, USA · Arts, Culture & Humanities · Latest available filing year: 2015 · Primary form: IRS Form 990

  19. OKTEPOklahoma Tribal Engagement Partners Inc

    EIN 841978659 · Headquarters: Stillwater, OK, USA · Health Care · Latest available filing year: 2024 · Primary form: IRS Form 990

  20. Omicron Lambda Chapter of Omega Psi Phi Fraternity Inc

    EIN 274932428 · Headquarters: Stillwater, OK, US · Community Improvement & Capacity Building · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  21. Operation Catnip Stillwater Inc

    EIN 454887744 · Headquarters: Stillwater, OK, US · Animal Related · Latest available filing year: 2019 · Primary form: IRS Form 990-N

  22. Osu Animal Science Alumni Association

    EIN 820894344 · Headquarters: STILLWATER, OK, USA · Education · Latest available filing year: 2024 · Primary form: IRS Form 990

  23. OSU Pi Kappa Alpha Parents Club Inc

    EIN 881946675 · Headquarters: Stillwater, OK, US · Education · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  24. Osu Society for Veterinary Surgery & Anesthesiology

    EIN 463583103 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2018 · Primary form: IRS Form 990-N

  25. Osu Student Chapter of American Association of Feline Practitioner

    EIN 994251750 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  26. Osu-university Multispectral Laboratories Llc

    EIN 861160864 · Headquarters: STILLWATER, OK, USA · Education · Latest available filing year: 2022 · Primary form: IRS Form 990

  27. Parent Booster USA Inc

    EIN 413070562 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  28. Parents Club of Alpha-eta Zeta Lamda Chi Alpha

    EIN 731552821 · Headquarters: Stillwater, OK, US · Education · Latest available filing year: 2015 · Primary form: IRS Form 990-N

  29. Pathfinder Project

    EIN 460579807 · Headquarters: Stillwater, OK, US · Crime & Legal Related · Latest available filing year: 2021 · Primary form: IRS Form 990-N

  30. Payne County Animal Response Team Inc

    EIN 475661919 · Headquarters: STILLWATER, OK, US · Animal Related · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  31. Payne County Audubon Society

    EIN 731222183 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  32. Payne County Child Welfare Advisory Committee Inc

    EIN 730755168 · Headquarters: STILLWATER, OK, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  33. Payne County Conservation Foundation Inc

    EIN 731392958 · Headquarters: STILLWATER, OK, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  34. Payne County Drug Court Inc

    EIN 731573279 · Headquarters: STILLWATER, OK, USA · Mental Health & Crisis Intervention · Latest available filing year: 2024 · Primary form: IRS Form 990

  35. Payne County Genealogical Society

    EIN 731281679 · Headquarters: Stillwater, OK, US · Arts, Culture & Humanities · Latest available filing year: 2013 · Primary form: IRS Form 990-N

  36. Payne County Pride Association

    EIN 831850769 · Headquarters: Stillwater, OK, US · Civil Rights, Social Action & Advocacy · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  37. Payne County Rural Water Corporation 3

    EIN 237433333 · Headquarters: STILLWATER, OK, USA · Public & Societal Benefit · Latest available filing year: 2018 · Primary form: IRS Form 990

  38. Payne County Youth Services Inc

    EIN 731093612 · Headquarters: Stillwater, OK, USA · Human Services · Latest available filing year: 2024 · Primary form: IRS Form 990

  39. Payne Pawnee Noble County Medical Society

    EIN 331068710 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  40. Pflag Stillwater

    EIN 731576108 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  41. Phi Delta Theta Oklahoma Beta Chapter

    EIN 730587619 · Headquarters: Stillwater, OK, USA · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-EZ

  42. Phi Gamma Delta Fraternity

    EIN 730723364 · Headquarters: STILLWATER, OK, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  43. Phi Kappa Sigma Fraternity

    EIN 812463910 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  44. Phi Kappa Tau Fraternity

    EIN 730584811 · Headquarters: STILLWATER, OK, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  45. Phi Upsilon House Corporation of Delta Delta Delta

    EIN 730749871 · Headquarters: STILLWATER, OK, USA · Unknown & Unclassified · Latest available filing year: 2021 · Primary form: IRS Form 990

  46. Phi Upsilon Omicron Inc

    EIN 736097295 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  47. Pi Kappa Phi Fraternity Gamma Upsilon

    EIN 994420114 · Headquarters: STILLWATER, OK, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  48. Pi Tau Sigma

    EIN 736103709 · Headquarters: Stillwater, OK, US · Education · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  49. Pioneer Tennis Booster Club

    EIN 474364839 · Headquarters: Stillwater, OK, US · Recreation & Sports · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  50. Plains Seed Foundation

    EIN 814754278 · Headquarters: Stillwater, OK, US · Science & Technology · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  51. Pleasant Valley School Foundation

    EIN 731301845 · Headquarters: STILLWATER, OK, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  52. Porkchops Love Foundation Inc

    EIN 851533880 · Headquarters: Stillwater, OK, US · Mental Health & Crisis Intervention · Latest available filing year: 2021 · Primary form: IRS Form 990-N

  53. Prairie One Solutions Inc

    EIN 861733149 · Headquarters: STILLWATER, OK, USA · Health Care · Latest available filing year: 2023 · Primary form: IRS Form 990

  54. Project Local Community

    EIN 810909974 · Headquarters: Stillwater, OK, US · Community Improvement & Capacity Building · Latest available filing year: 2020 · Primary form: IRS Form 990-N

  55. Project Orange Basket

    EIN 392934701 · Headquarters: STILLWATER, OK, US · Human Services · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  56. Psi Chi the International Honor Society in Psychology

    EIN 736103707 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  57. Pta Oklahoma Congress

    EIN 237123935 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  58. Pta Oklahoma Congress

    EIN 237316205 · Headquarters: Stillwater, OK, US · Education · Latest available filing year: 2018 · Primary form: IRS Form 990-N

  59. Pta Oklahoma Congress

    EIN 731014869 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2020 · Primary form: IRS Form 990-N

  60. Pta Oklahoma Congress

    EIN 731016553 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  61. Pta Oklahoma Congress

    EIN 731059977 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2019 · Primary form: IRS Form 990-N

  62. Pta Oklahoma Congress

    EIN 731101806 · Headquarters: Stillwater, OK, US · Education · Latest available filing year: 2015 · Primary form: IRS Form 990-N

  63. Pta Oklahoma Congress

    EIN 731236207 · Headquarters: Stillwater, OK, US · Education · Latest available filing year: 2018 · Primary form: IRS Form 990-N

  64. Pta Oklahoma Congress

    EIN 731450508 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2021 · Primary form: IRS Form 990-N

  65. Raising Voices Inc

    EIN 331955483 · Headquarters: Stillwater, OK, US · Arts, Culture & Humanities · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  66. Redeemed Global Ministries Inc

    EIN 992314933 · Headquarters: Stillwater, OK, USA · Religion Related · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  67. Request Relief Foundation

    EIN 331694339 · Headquarters: Stillwater, OK, US · Human Services · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  68. Resilient Payne County Inc

    EIN 834500318 · Headquarters: STILLWATER, OK, US · Crime & Legal Related · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  69. Richard James Family Foundation

    EIN 731589377 · Headquarters: STILLWATER, OK, USA · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2025 · Primary form: IRS Form 990-PF

  70. Ripley Golf Club

    EIN 995116429 · Headquarters: Stillwater, OK, US · Recreation & Sports · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  71. Ripple Effect Research Foundation

    EIN 413158727 · Headquarters: Stillwater, OK, US · Social Science · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  72. Robert Turner Ministries Inc

    EIN 208936673 · Headquarters: Stillwater, OK, US · Religion Related · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  73. Rotary International

    EIN 237413839 · Headquarters: Stillwater, OK, USA · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-EZ

  74. Rotary International

    EIN 731367420 · Headquarters: Stillwater, OK, US · Community Improvement & Capacity Building · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  75. Royal & Select Masters Stillwater Council No 50

    EIN 237270903 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  76. Royal Arch Mason 14 Stillwater

    EIN 237296200 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  77. Rural Energy Resources Inc

    EIN 991860593 · Headquarters: STILLWATER, OK, US · Human Services · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  78. San Jacinto Foundation

    EIN 264326536 · Headquarters: STILLWATER, OK, USA · Youth Development · Latest available filing year: 2013 · Primary form: IRS Form 990

  79. Sangre Ridge Elementary Pto

    EIN 842412070 · Headquarters: Stillwater, OK, USA · Education · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  80. Sc Auctioneers Association Inc

    EIN 571043341 · Headquarters: STILLWATER, OK, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  81. Scabbard and Blade Endowment Resources Inc

    EIN 237088020 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  82. SGH Foundation

    EIN 811751350 · Headquarters: Stillwater, OK, US · Community Improvement & Capacity Building · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  83. Shilohs Place Inc

    EIN 814655756 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  84. Show Compassion Foundation

    EIN 823597878 · Headquarters: STILLWATER, OK, US · Human Services · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  85. Shs Ce Donart Museum Foundation

    EIN 061774848 · Headquarters: STILLWATER, OK, US · Arts, Culture & Humanities · Latest available filing year: 2014 · Primary form: IRS Form 990-N

  86. SHS Pioneer Baseball Dugout Club Inc

    EIN 923753146 · Headquarters: Stillwater, OK, USA · Education · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  87. Sigma Chi Parents Club

    EIN 922038627 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  88. Sigma Gamma Tau National Honor Society in Aerospace Engineering

    EIN 911789915 · Headquarters: Stillwater, OK, US · Education · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  89. Sigma Phi Epsilon Fraternity Inc

    EIN 521316711 · Headquarters: Stillwater, OK, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  90. Sigma Pi Fraternity International Inc

    EIN 272280099 · Headquarters: Stillwater, OK, US · Education · Latest available filing year: 2014 · Primary form: IRS Form 990-N

  91. Sjc Sports

    EIN 833755153 · Headquarters: STILLWATER, OK, US · Recreation & Sports · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  92. Skyline Elementary Pta

    EIN 731052994 · Headquarters: STILLWATER, OK, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  93. Smart Start North Central Oklahoma Inc

    EIN 841640787 · Headquarters: STILLWATER, OK, USA · Education · Latest available filing year: 2014 · Primary form: IRS Form 990

  94. Smc Development Inc

    EIN 843832298 · Headquarters: STILLWATER, OK, USA · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2024 · Primary form: IRS Form 990

  95. SMC Equipment Inc

    EIN 831342710 · Headquarters: Stillwater, OK, USA · Housing & Shelter · Latest available filing year: 2024 · Primary form: IRS Form 990

  96. Social Media Advisory Counsel Inc

    EIN 463355248 · Headquarters: Stillwater, OK, US · Public & Societal Benefit · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  97. Society for Scientific Exploration

    EIN 541191441 · Headquarters: Stillwater, OK, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  98. Society of Fire Protection Engineers

    EIN 201615855 · Headquarters: Stillwater, OK, US · Public Safety, Disaster Preparedness & Relief · Latest available filing year: 2007 · Primary form: IRS Form 990-N

  99. Society of Historians of Scandinavia in North America

    EIN 870666747 · Headquarters: Stillwater, OK, US · Arts, Culture & Humanities · Latest available filing year: 2020 · Primary form: IRS Form 990-N

  100. Society of Phi Zeta

    EIN 736109389 · Headquarters: Stillwater, OK, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

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