Unknown & Unclassified nonprofits in California

Unknown & Unclassified nonprofits in California. Browse 48,218 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 Phi Omega Sorority Inc

    EIN 843528891 · Headquarters: San Diego, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  2. Sigma Pi Fraternity - Upsilon Chapter

    EIN 951786209 · Headquarters: LOS ANGELES, CA, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  3. SIGMA PI FRATERNITY Alpha-Omicron Chapter

    EIN 208374657 · Headquarters: GOLETA, CA, USA · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-EZ

  4. Sigma Pi Fraternity Educational Fund

    EIN 330490547 · Headquarters: SAN DIEGO, CA, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-PF

  5. Sigma Pi Fraternity International Inc

    EIN 474983478 · Headquarters: San Clemente, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  6. Sigma Pi Fraternity Zeta Eta Chaper

    EIN 311207375 · Headquarters: Santa Clara, CA, USA · Unknown & Unclassified · Latest available filing year: 2017 · Primary form: IRS Form 990-EZ

  7. Sigma Pi Iota Chapter

    EIN 941166470 · Headquarters: MORAGA, CA, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  8. Sigma Psi Zeta

    EIN 474028644 · Headquarters: San Jose, CA, US · Unknown & Unclassified · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  9. Sigma Sigma Phi

    EIN 263308012 · Headquarters: Pomona, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  10. Sigma Sigma Sigma Inc

    EIN 273807974 · Headquarters: San Diego, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  11. Sigma Sigma Sigma Inc

    EIN 273956185 · Headquarters: San Jose, CA, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  12. Sigma Sigma Sigma Inc

    EIN 825044256 · Headquarters: Los Angeles, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  13. Sigma Sigma Sigma Inc

    EIN 953245878 · Headquarters: Downey, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  14. Sigma Sigma Sigma Inc Sacramento Alumni Assoc of Sigma Si

    EIN 320478061 · Headquarters: PLEASANT GROVE, CA, US · Unknown & Unclassified · Latest available filing year: 2021 · Primary form: IRS Form 990-N

  15. Sigma Theta Tau Alpha Eta Chapter School of Nursing Ucsf

    EIN 946129571 · Headquarters: SAN FRANCISCO, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  16. Sigma Theta Tau Inc

    EIN 237111288 · Headquarters: San Francisco, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  17. Sigma Theta Tau Inc

    EIN 237377861 · Headquarters: Loma Linda, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  18. Sigma Theta Tau Inc

    EIN 237414498 · Headquarters: San Diego, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  19. Sigma Theta Tau Inc

    EIN 311042695 · Headquarters: Sacramento, CA, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  20. Sigma Theta Tau Inc

    EIN 311042707 · Headquarters: SAN DIEGO, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  21. Sigma Theta Tau Inc

    EIN 311242949 · Headquarters: Azusa, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  22. Sigma Theta Tau Inc

    EIN 311309927 · Headquarters: Sebastopol, CA, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  23. Sigma Theta Tau Inc

    EIN 311309962 · Headquarters: REEDLEY, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  24. Sigma Theta Tau Inc

    EIN 311379920 · Headquarters: Concord, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  25. Sigma Theta Tau Inc

    EIN 351928437 · Headquarters: San Francisco, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  26. Sigma Theta Tau Inc

    EIN 351928458 · Headquarters: Bakersfield, CA, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  27. Sigma Theta Tau Inc

    EIN 363479088 · Headquarters: Long Beach, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  28. Sigma Theta Tau International

    EIN 352749691 · Headquarters: San Diego, CA, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  29. Sigma Theta Tau International

    EIN 900757109 · Headquarters: San Marcos, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  30. Sigma Theta Tau International Inc

    EIN 311242973 · Headquarters: Chico, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  31. Sigma Theta Tau International Inc

    EIN 311361616 · Headquarters: Los Angeles, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  32. Sigma Theta Tau International Inc

    EIN 510232370 · Headquarters: Ventura, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  33. Sigma Theta Tau International Inc

    EIN 883608830 · Headquarters: Los Angeles, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  34. Sigma Theta Tau International Inc

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

  35. Sigma Theta Tau International Inc

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

  36. Sigma Theta Tau International Inc

    EIN 901029454 · Headquarters: Irvine, CA, 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 912039522 · Headquarters: San Bernardino, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  39. 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

  40. Sign Pictorial & Display Health & Welfare

    EIN 946087594 · Headquarters: PLEASANTON, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  41. Signal Hill Chamber of Commerce

    EIN 956101232 · Headquarters: SIGNAL HILL, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  42. Signal Hill Police Officers' Association

    EIN 953862883 · Headquarters: SIGNAL HILL, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  43. Signal Integrity Emergency Radio Re Sponse Alliance

    EIN 423255578 · Headquarters: Murphys, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  44. Signet Circle Corporation

    EIN 956059103 · Headquarters: Los Angeles, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  45. Signet Corporation of Santa Barbara C/o Alex Kernus

    EIN 237401218 · Headquarters: MARINA DEL REY, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  46. Signet Council No 230 Amd

    EIN 272273038 · Headquarters: CLAREMONT, CA, US · Unknown & Unclassified · Latest available filing year: 2013 · Primary form: IRS Form 990-N

  47. Signet-life Mission Church

    EIN 883472442 · Headquarters: Chino, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  48. Signifyin' Works

    EIN 943134400 · Headquarters: BERKELEY, CA, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  49. Sikh Dharma Brotherhood of the Bay Area

    EIN 942533479 · Headquarters: San Leandro, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  50. Sikh Dharma of San Diego

    EIN 953256052 · Headquarters: San Diego, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  51. Sikh Foundation

    EIN 237035676 · Headquarters: Palo Alto, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-PF

  52. Sikh Gurdwara of Los Angeles Inc

    EIN 330325396 · Headquarters: North Hollywood, CA, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  53. Sikh Legends of America

    EIN 882846411 · Headquarters: GALT, CA, USA · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-EZ

  54. Sikh Religious Education Society Inc

    EIN 994255224 · Headquarters: BAKERSFIELD, CA, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  55. Sikh Temple Sacramento

    EIN 942883451 · Headquarters: WEST SACRAMENTO, CA, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  56. Sikh Temple Turlock California

    EIN 770192194 · Headquarters: TURLOCK, CA, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  57. Silent Valley Club Inc

    EIN 237273075 · Headquarters: BANNING, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  58. Silent Voices Inc Dba Real Choices Chula Vista

    EIN 330451695 · Headquarters: CHULA VISTA, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  59. Silgan Containers Corp Sub USWA Master Pl VEBA Tr 112795

    EIN 954574729 · Headquarters: Woodland Hills, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  60. Silicon Area Mountain Bike Youth

    EIN 465138070 · Headquarters: San Jose, CA, US · Unknown & Unclassified · Latest available filing year: 2018 · Primary form: IRS Form 990-N

  61. Silicon Valley Arts Coalition of San Jose Inc

    EIN 200128230 · Headquarters: MOUNTAIN VIEW, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  62. Silicon Valley Association of Health Underwriters

    EIN 770477306 · Headquarters: Laguna Beach, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  63. Silicon Valley Association of Insurance & Financial Advisors Inc

    EIN 942642817 · Headquarters: Los Angeles, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  64. Silicon Valley Autonomy Association International Inc

    EIN 760837220 · Headquarters: Moffett Field, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  65. Silicon Valley Business Travel Association

    EIN 770083457 · Headquarters: San Francisco, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  66. Silicon Valley Central Chamber of Commerce

    EIN 940675790 · Headquarters: SANTA CLARA, CA, USA · Unknown & Unclassified · Latest available filing year: 2020 · Primary form: IRS Form 990

  67. Silicon Valley Chapter of Construction Financial Management Association

    EIN 770208132 · Headquarters: SANTA CLARA, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  68. Silicon Valley Chapter of Military Officers Association of America

    EIN 770310326 · Headquarters: Moffett Federal Airfie, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  69. Silicon Valley Chapter of the Financial Planning Association

    EIN 770381724 · Headquarters: SANTA CLARA, CA, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  70. Silicon Valley Chapter of the National Association of Industrial & Office Parks

    EIN 770106592 · Headquarters: SAN FRANCISCO, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  71. Silicon Valley Computer Genealogy Group

    EIN 770314741 · Headquarters: San Ramon, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  72. Silicon Valley Contractors Association

    EIN 942494903 · Headquarters: SANTA CLARA, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  73. Silicon Valley Democratic Socialists of America

    EIN 832827035 · Headquarters: San Jose, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  74. Silicon Valley Educator Network

    EIN 461668904 · Headquarters: Cupertino, CA, US · Unknown & Unclassified · Latest available filing year: 2012 · Primary form: IRS Form 990-N

  75. Silicon Valley International School

    EIN 942599581 · Headquarters: Palo Alto, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  76. Silicon Valley Korean School

    EIN 912013547 · Headquarters: Cupertino, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  77. Silicon Valley Public Accountability Foundation

    EIN 871939167 · Headquarters: San Jose, CA, US · Unknown & Unclassified · Latest available filing year: 2021 · Primary form: IRS Form 990-N

  78. Silicon Valley Realtors Charitable Foundation

    EIN 943250924 · Headquarters: CUPERTINO, CA, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  79. Silicon Valley Rising Action

    EIN 474979642 · Headquarters: San Jose, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  80. Silicon Valley Rising Action Issues Committee

    EIN 852106737 · Headquarters: Sacramento, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  81. Silicon Valley Rwa

    EIN 770481643 · Headquarters: San Jose, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  82. Silicon Valley Softball League

    EIN 770576310 · Headquarters: San Jose, CA, US · Unknown & Unclassified · Latest available filing year: 2014 · Primary form: IRS Form 990-N

  83. Silicon Valley Swing Dance Education Society

    EIN 813803358 · Headquarters: SUNNYVALE, CA, US · Unknown & Unclassified · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  84. Silicon Valley Taxpayers Association Inc

    EIN 770007495 · Headquarters: San Jose, CA, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  85. Silicon Valley Tech Academy Inc

    EIN 845182712 · Headquarters: SAN JOSE, CA, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  86. Silicon Valleysanta Clara Dmo Inc

    EIN 845027257 · Headquarters: SANTA CLARA, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  87. Silken Windhound Health and Rescue

    EIN 921301911 · Headquarters: STANTON, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  88. Silkworm Peace Institute

    EIN 020542467 · Headquarters: lafayette, CA, US · Unknown & Unclassified · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  89. Sillicon Valley Ethiopian Community Association

    EIN 871993490 · Headquarters: San Jose, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  90. Silliman University College of Nursing Alumni Association Intl

    EIN 562673755 · Headquarters: Ontario, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  91. Silva Valley School Pta

    EIN 680270844 · Headquarters: El Dorado Hills, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  92. Silver Bay Kennel Club of San Diego Inc

    EIN 237031717 · Headquarters: Bonita, CA, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  93. Silver City Mutual Water Company

    EIN 770049953 · Headquarters: Visalia, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  94. Silver Gate Three Stars Masonic Hall Association

    EIN 951958600 · Headquarters: San Diego, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  95. Silver Kings and Queens Inc

    EIN 942512282 · Headquarters: King City, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  96. Silver Lake Mens Golf Club

    EIN 953025433 · Headquarters: HELENDALE, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  97. Silver Lake New Hope Courtyard Apartments

    EIN 954479135 · Headquarters: GLENDALE, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  98. Silver Lakes Womens Golf Club

    EIN 510192537 · Headquarters: Helendale, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  99. Silver N' Black Helping Hands Foundation

    EIN 811974995 · Headquarters: SAN JOSE, CA, US · Unknown & Unclassified · Latest available filing year: 2017 · Primary form: IRS Form 990-N

  100. Silver Wings Flying Club

    EIN 770402081 · Headquarters: Los Gatos, CA, US · Unknown & Unclassified · Latest available filing year: 2022 · Primary form: IRS Form 990-N

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