Nonprofits in California

Nonprofits in California. Browse 229,931 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. Oppurrtunities Adoptions

    EIN 463142575 · Headquarters: Costa Mesa, CA, US · Animal Related · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  2. OPS Foundation

    EIN 203570498 · Headquarters: Greenbrae, CA, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990-PF

  3. Opsam Health

    EIN 953008798 · Headquarters: CHULA VISTA, CA, USA · Health Care · Latest available filing year: 2024 · Primary form: IRS Form 990

  4. Opscientia Labs Inc

    EIN 873591887 · Headquarters: San Diego, CA, US · Science & Technology · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  5. Opt Citizen Science Foundation

    EIN 463114445 · Headquarters: Cadiff, CA, US · Social Science · Latest available filing year: 2017 · Primary form: IRS Form 990-N

  6. Opti Club of La Mesa Californ 41070

    EIN 364629070 · Headquarters: Spring Valley, CA, US · Youth Development · Latest available filing year: 2011 · Primary form: IRS Form 990-N

  7. Optica Silicon Valley

    EIN 931978553 · Headquarters: SAN JOSE, CA, US · Education · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  8. Optical Internetworking Forum

    EIN 911897518 · Headquarters: Fremont, CA, USA · Community Improvement & Capacity Building · Latest available filing year: 2024 · Primary form: IRS Form 990

  9. Optical Society of Southern California Inc

    EIN 824179844 · Headquarters: Tustin, CA, US · Education · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  10. Optical Storage Technology Association

    EIN 770316654 · Headquarters: Santa Clara, CA, USA · Diseases, Disorders & Medical Disciplines · Latest available filing year: 2017 · Primary form: IRS Form 990-EZ

  11. Optima Cares Foundation

    EIN 872445692 · Headquarters: SANTA ANA, CA, USA · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2025 · Primary form: IRS Form 990-PF

  12. Optima Foundation Inc

    EIN 332221814 · Headquarters: UPLAND, CA, USA · Housing & Shelter · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  13. Optimal Child Development Center

    EIN 953374660 · Headquarters: COMPTON, CA, USA · Human Services · Latest available filing year: 2024 · Primary form: IRS Form 990

  14. Optimal Learning Inc

    EIN 882568471 · Headquarters: SAN BERNARDINO, CA, US · Education · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  15. Optimal Mind Institute

    EIN 821554762 · Headquarters: Burbank, CA, US · Mental Health & Crisis Intervention · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  16. Optimal Performance Institute

    EIN 770416479 · Headquarters: Sunnyvale, CA, US · Education · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  17. Optimentality

    EIN 812793152 · Headquarters: LAGUNA NIGUEL, CA, USA · Human Services · Latest available filing year: 2024 · Primary form: IRS Form 990

  18. Optimism Foundation

    EIN 872317592 · Headquarters: MILPITAS, CA, USA · Human Services · Latest available filing year: 2025 · Primary form: IRS Form 990-PF

  19. Optimist Blind Youth Association

    EIN 953868720 · Headquarters: WEST HILLS, CA, US · Recreation & Sports · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  20. Optimist Boys' Home and Ranch Inc

    EIN 951643340 · Headquarters: Los Angeles, CA, USA · Mental Health & Crisis Intervention · Latest available filing year: 2024 · Primary form: IRS Form 990

  21. Optimist Club Of Arroyo Grande

    EIN 237455475 · Headquarters: Arroyo Grande, CA, USA · Mutual & Membership Benefit · Latest available filing year: 2023 · Primary form: IRS Form 990-EZ

  22. Optimist Club of Burbank

    EIN 954572694 · Headquarters: SUN VALLEY, CA, US · Unknown & Unclassified · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  23. Optimist Club of Carlsbad Foundation

    EIN 680414602 · Headquarters: Carlsbad, CA, US · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  24. Optimist Club of Country Club

    EIN 946175355 · Headquarters: Roseville, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  25. Optimist Club of Malibu Charitable Found

    EIN 912102426 · Headquarters: MALIBU, CA, USA · Education · Latest available filing year: 2023 · Primary form: IRS Form 990-EZ

  26. Optimist Club of Nipomo

    EIN 394483095 · Headquarters: PASO ROBLES, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  27. Optimist Club of Palm Desert Youth Fund Inc

    EIN 330936429 · Headquarters: Morongo Valley, CA, US · Youth Development · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  28. Optimist Club of Redlands

    EIN 956102964 · Headquarters: REDLANDS, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  29. Optimist Club of Sacramento Foundation Inc

    EIN 274592166 · Headquarters: SACRAMENTO, CA, US · Education · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  30. Optimist Club of Sacramento Inc

    EIN 274344012 · Headquarters: SACRAMENTO, CA, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  31. Optimist Club of San Leandro

    EIN 942582214 · Headquarters: San Leandro, CA, USA · Public Safety, Disaster Preparedness & Relief · Latest available filing year: 2020 · Primary form: IRS Form 990

  32. Optimist Club of South Lake Tahoe

    EIN 946107715 · Headquarters: SOUTH LAKE TAHOE, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  33. Optimist Club of Suburban Buena Park

    EIN 953546681 · Headquarters: Cerritos, CA, USA · Unknown & Unclassified · Latest available filing year: 2018 · Primary form: IRS Form 990-EZ

  34. Optimist Club of Valley Center

    EIN 237273014 · Headquarters: Valley Center, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  35. Optimist Club of Vista

    EIN 956095801 · Headquarters: VISTA, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  36. Optimist Club Pacific Southwest Dist

    EIN 952103771 · Headquarters: Valencia, CA, USA · Unknown & Unclassified · Latest available filing year: 2020 · Primary form: IRS Form 990-EZ

  37. Optimist Dads Day Dash

    EIN 263823115 · Headquarters: WEST HILLS, CA, US · Diseases, Disorders & Medical Disciplines · Latest available filing year: 2019 · Primary form: IRS Form 990-N

  38. Optimist Foundation for Hadicapped Camping Inc

    EIN 237257395 · Headquarters: SACRAMENTO, CA, US · Recreation & Sports · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  39. Optimist Int 20489 OC of Truckee CA

    EIN 237176314 · Headquarters: Truckee, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  40. Optimist International

    EIN 237007768 · Headquarters: SAN FRANCISCO, CA, US · Youth Development · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  41. Optimist International

    EIN 237008887 · Headquarters: Pomona, CA, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  42. Optimist International

    EIN 237014276 · Headquarters: SAN DIEGO, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  43. Optimist International

    EIN 237017371 · Headquarters: Pasadena, CA, US · Unknown & Unclassified · Latest available filing year: 2020 · Primary form: IRS Form 990-N

  44. Optimist International

    EIN 237032863 · Headquarters: Newark, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  45. Optimist International

    EIN 237064822 · Headquarters: LA MESA, CA, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  46. Optimist International

    EIN 237083413 · Headquarters: Encino, CA, US · Unknown & Unclassified · Latest available filing year: 2019 · Primary form: IRS Form 990-N

  47. Optimist International

    EIN 237095059 · Headquarters: CORONADO, CA, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  48. Optimist International

    EIN 237152532 · Headquarters: Goleta, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  49. Optimist International

    EIN 237176245 · Headquarters: Hanford, CA, US · Youth Development · Latest available filing year: 2010 · Primary form: IRS Form 990-N

  50. Optimist International

    EIN 237455473 · Headquarters: Fresno, CA, US · Youth Development · Latest available filing year: 2010 · Primary form: IRS Form 990-N

  51. Optimist International

    EIN 300122139 · Headquarters: Los Osos, CA, US · Youth Development · Latest available filing year: 2008 · Primary form: IRS Form 990-N

  52. Optimist International

    EIN 320016102 · Headquarters: Santa Barbara, CA, US · Youth Development · Latest available filing year: 2010 · Primary form: IRS Form 990-N

  53. Optimist International

    EIN 330185029 · Headquarters: South Gate, CA, US · Unknown & Unclassified · Latest available filing year: 2021 · Primary form: IRS Form 990-N

  54. Optimist International

    EIN 330224493 · Headquarters: IMPERI, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  55. Optimist International

    EIN 330362835 · Headquarters: Pasadena, CA, US · Youth Development · Latest available filing year: 2008 · Primary form: IRS Form 990-N

  56. Optimist International

    EIN 330395558 · Headquarters: SAN DIEGO, CA, US · Unknown & Unclassified · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  57. Optimist International

    EIN 330628707 · Headquarters: santee, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  58. Optimist International

    EIN 330897637 · Headquarters: chula vista, CA, US · Youth Development · Latest available filing year: 2010 · Primary form: IRS Form 990-N

  59. Optimist International

    EIN 363185367 · Headquarters: EL CENTRO, CA, US · Youth Development · Latest available filing year: 2014 · Primary form: IRS Form 990-N

  60. Optimist International

    EIN 363989609 · Headquarters: san diego, CA, US · Youth Development · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  61. Optimist International

    EIN 363989611 · Headquarters: santee, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  62. Optimist International

    EIN 364029815 · Headquarters: El Cajon, CA, US · Arts, Culture & Humanities · Latest available filing year: 2008 · Primary form: IRS Form 990-N

  63. Optimist International

    EIN 364088609 · Headquarters: San Leandro, CA, US · Youth Development · Latest available filing year: 2015 · Primary form: IRS Form 990-N

  64. Optimist International

    EIN 364088612 · Headquarters: VALLEJO, CA, US · Youth Development · Latest available filing year: 2017 · Primary form: IRS Form 990-N

  65. Optimist International

    EIN 432109276 · Headquarters: RANCHO CORDOVA, CA, US · Youth Development · Latest available filing year: 2012 · Primary form: IRS Form 990-N

  66. Optimist International

    EIN 472296122 · Headquarters: Marina Del Rey, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  67. Optimist International

    EIN 473441176 · Headquarters: Chula Vista, CA, US · Youth Development · Latest available filing year: 2014 · Primary form: IRS Form 990-N

  68. Optimist International

    EIN 474110006 · Headquarters: Sacramento, CA, US · Youth Development · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  69. Optimist International

    EIN 475534009 · Headquarters: CHULA VISTA, CA, US · Unknown & Unclassified · Latest available filing year: 2017 · Primary form: IRS Form 990-N

  70. Optimist International

    EIN 475549557 · Headquarters: San Diego, CA, US · Unknown & Unclassified · Latest available filing year: 2019 · Primary form: IRS Form 990-N

  71. Optimist International

    EIN 510170940 · Headquarters: BONITA, CA, US · Youth Development · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  72. Optimist International

    EIN 510173799 · Headquarters: Montebello, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  73. Optimist International

    EIN 680289069 · Headquarters: Elk Grove, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  74. Optimist International

    EIN 680324227 · Headquarters: Rancho Murieta, CA, US · Youth Development · Latest available filing year: 2010 · Primary form: IRS Form 990-N

  75. Optimist International

    EIN 680331389 · Headquarters: San Andreas, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  76. Optimist International

    EIN 680400307 · Headquarters: Oroville, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  77. Optimist International

    EIN 680482306 · Headquarters: Chico, CA, US · Unknown & Unclassified · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  78. Optimist International

    EIN 721551150 · Headquarters: Montebello, CA, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  79. Optimist International

    EIN 770262234 · Headquarters: Tehachapi, CA, US · Youth Development · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  80. Optimist International

    EIN 770292016 · Headquarters: PASO ROBLES, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  81. Optimist International

    EIN 770308238 · Headquarters: REDWOOD CITY, CA, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  82. Optimist International

    EIN 770546552 · Headquarters: Santa Rosa Valley, CA, US · Youth Development · Latest available filing year: 2011 · Primary form: IRS Form 990-N

  83. Optimist International

    EIN 811177616 · Headquarters: SAN DIEGO, CA, US · Unknown & Unclassified · Latest available filing year: 2015 · Primary form: IRS Form 990-N

  84. Optimist International

    EIN 823619053 · Headquarters: Santee, CA, US · Unknown & Unclassified · Latest available filing year: 2019 · Primary form: IRS Form 990-N

  85. Optimist International

    EIN 823637686 · Headquarters: Visalia, CA, US · Youth Development · Latest available filing year: 2017 · Primary form: IRS Form 990-N

  86. Optimist International

    EIN 825398984 · Headquarters: Bonita, CA, US · Unknown & Unclassified · Latest available filing year: 2017 · Primary form: IRS Form 990-N

  87. Optimist International

    EIN 841787842 · Headquarters: Malibu, CA, US · Unknown & Unclassified · Latest available filing year: 2020 · Primary form: IRS Form 990-N

  88. Optimist International

    EIN 872778779 · Headquarters: Sacramento, CA, US · Human Services · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  89. Optimist International

    EIN 883636456 · Headquarters: ELK GROVE, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  90. Optimist International

    EIN 900183833 · Headquarters: San Diego, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  91. Optimist International

    EIN 900248507 · Headquarters: Sylmar, CA, US · Youth Development · Latest available filing year: 2011 · Primary form: IRS Form 990-N

  92. Optimist International

    EIN 900249710 · Headquarters: Granada Hills, CA, US · Youth Development · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  93. Optimist International

    EIN 900252955 · Headquarters: Bakersfield, CA, US · Youth Development · Latest available filing year: 2011 · Primary form: IRS Form 990-N

  94. Optimist International

    EIN 900286390 · Headquarters: CASTAIC, CA, US · Youth Development · Latest available filing year: 2012 · Primary form: IRS Form 990-N

  95. Optimist International

    EIN 900295546 · Headquarters: Bakersfield, CA, US · Youth Development · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  96. Optimist International

    EIN 900334440 · Headquarters: OCOTILLO, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  97. Optimist International

    EIN 900336173 · Headquarters: Exeter, CA, US · Youth Development · Latest available filing year: 2017 · Primary form: IRS Form 990-N

  98. Optimist International

    EIN 900416579 · Headquarters: Bakersfield, CA, US · Youth Development · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  99. Optimist International

    EIN 900819280 · Headquarters: Bakersfield, CA, US · Youth Development · Latest available filing year: 2012 · Primary form: IRS Form 990-N

  100. Optimist International

    EIN 900954722 · Headquarters: HUNTINGTON BEACH, CA, US · Youth Development · Latest available filing year: 2018 · Primary form: IRS Form 990-N

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