Nonprofits in San Mateo, California

Nonprofits in San Mateo, California. Browse 663 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. 1020 Iowa Avenue Inc

    EIN 943341908 · Headquarters: SAN MATEO, CA, USA · Community Improvement & Capacity Building · Latest available filing year: 2022 · Primary form: IRS Form 990

  2. 130 North Brand Boulevard Inc

    EIN 943257352 · Headquarters: SAN MATEO, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  3. 17909 Soledad Canyon Corp

    EIN 460946060 · Headquarters: SAN MATEO, CA, US · Community Improvement & Capacity Building · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  4. 18433 Roscoe Boulevard Inc

    EIN 943306052 · Headquarters: SAN MATEO, CA, USA · Community Improvement & Capacity Building · Latest available filing year: 2020 · Primary form: IRS Form 990

  5. 19Th Avenue Park Neighborhood Association

    EIN 264354240 · Headquarters: san mateo, CA, US · Community Improvement & Capacity Building · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  6. 282 Harbor Drive Corp

    EIN 461195894 · Headquarters: SAN MATEO, CA, USA · Community Improvement & Capacity Building · Latest available filing year: 2024 · Primary form: IRS Form 990

  7. 28677862 Observe Toastmasters

    EIN 333347686 · Headquarters: San Mateo, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  8. 33 Baseball Foundation

    EIN 462491848 · Headquarters: SAN MATEO, CA, USA · Recreation & Sports · Latest available filing year: 2017 · Primary form: IRS Form 990-PF

  9. 350 S Catalina Street Inc

    EIN 753056952 · Headquarters: SAN MATEO, CA, USA · Community Improvement & Capacity Building · Latest available filing year: 2015 · Primary form: IRS Form 990

  10. 4022 Chino Hills Pkwy Inc

    EIN 455112375 · Headquarters: SAN MATEO, CA, US · Mutual & Membership Benefit · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  11. 4240 Tweedy Boulevard Inc

    EIN 454650282 · Headquarters: SAN MATEO, CA, USA · Community Improvement & Capacity Building · Latest available filing year: 2024 · Primary form: IRS Form 990

  12. 4401 Santa Anita Corporation

    EIN 954207664 · Headquarters: SAN MATEO, CA, USA · Community Improvement & Capacity Building · Latest available filing year: 2021 · Primary form: IRS Form 990

  13. 4985 Hallmark Parkway Inc

    EIN 943286156 · Headquarters: SAN MATEO, CA, USA · Community Improvement & Capacity Building · Latest available filing year: 2024 · Primary form: IRS Form 990

  14. 650 Xtreme Volleyball Club

    EIN 270883871 · Headquarters: San Mateo, CA, USA · Youth Development · Latest available filing year: 2024 · Primary form: IRS Form 990

  15. 6510 General Drive Corporation

    EIN 943372034 · Headquarters: SAN MATEO, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  16. 7400 Stewart & Gray Inc

    EIN 455041971 · Headquarters: SAN MATEO, CA, US · Community Improvement & Capacity Building · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  17. 9424 Big Horn Corporation

    EIN 954410051 · Headquarters: SAN MATEO, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  18. A Clodhoppers Square Dance Group

    EIN 421743555 · Headquarters: SAN MATEO, CA, US · Unknown & Unclassified · Latest available filing year: 2014 · Primary form: IRS Form 990-N

  19. Aasara Inc

    EIN 880611996 · Headquarters: SAN MATEO, CA, USA · Animal Related · Latest available filing year: 2024 · Primary form: IRS Form 990-PF

  20. Abbott Middle School Drama Boosters Inc

    EIN 823265158 · Headquarters: San Mateo, CA, US · Arts, Culture & Humanities · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  21. Ac Water Polo Inc

    EIN 871002890 · Headquarters: SAN MATEO, CA, US · Recreation & Sports · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  22. Ace Athletics Youth Soccer Academy

    EIN 832724150 · Headquarters: SAN MATEO, CA, USA · Recreation & Sports · Latest available filing year: 2024 · Primary form: IRS Form 990

  23. Achieve Employee Care Fund Inc

    EIN 853466873 · Headquarters: San Mateo, CA, USA · Human Services · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  24. Addiction Education Society Inc

    EIN 464533989 · Headquarters: SAN MATEO, CA, USA · Mental Health & Crisis Intervention · Latest available filing year: 2024 · Primary form: IRS Form 990

  25. Aid for All Nations

    EIN 571233924 · Headquarters: San Mateo, CA, US · Human Services · Latest available filing year: 2012 · Primary form: IRS Form 990-N

  26. Align Scoliosis Foundation

    EIN 824704434 · Headquarters: SAN MATEO, CA, US · Diseases, Disorders & Medical Disciplines · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  27. Amasdar Foundation

    EIN 331531478 · Headquarters: SAN MATEO, CA, US · Public & Societal Benefit · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  28. Amateur Athletic Union of the United States Inc

    EIN 831897549 · Headquarters: San Mateo, CA, US · Recreation & Sports · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  29. Ambassador S Light Network Inc

    EIN 933641228 · Headquarters: San Mateo, CA, US · Mental Health & Crisis Intervention · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  30. American Academy of Matrimonial Lawyers Northern California Chapter

    EIN 510160237 · Headquarters: SAN MATEO, CA, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  31. American Asians Collaborating and Empowering

    EIN 884332379 · Headquarters: SAN MATEO, CA, US · Civil Rights, Social Action & Advocacy · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  32. American Association of University Women

    EIN 946083004 · Headquarters: San Mateo, CA, US · Education · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  33. American Association of University Women

    EIN 946086565 · Headquarters: San Mateo, CA, US · Education · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  34. American Federation of Labor

    EIN 940376370 · Headquarters: San Mateo, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  35. American Federation of Teachers

    EIN 237155568 · Headquarters: SAN MATEO, CA, USA · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-EZ

  36. American Legion Auxiliary

    EIN 900811312 · Headquarters: San Mateo, CA, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  37. American Legion Post 82

    EIN 941104846 · Headquarters: San Mateo, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  38. American Orff-schulwerk Association

    EIN 942362774 · Headquarters: SAN MATEO, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  39. American Postal Workers Union

    EIN 942820905 · Headquarters: SAN MATEO, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  40. Animal Run

    EIN 873698981 · Headquarters: SAN MATEO, CA, US · Animal Related · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  41. Annual Reviews

    EIN 941156476 · Headquarters: SAN MATEO, CA, USA · Science & Technology · Latest available filing year: 2024 · Primary form: IRS Form 990

  42. Annual Reviews Investment Corporation

    EIN 464548728 · Headquarters: SAN MATEO, CA, USA · Science & Technology · Latest available filing year: 2024 · Primary form: IRS Form 990

  43. Aragon Dons High School Foundation Inc

    EIN 030585271 · Headquarters: SAN MATEO, CA, US · Education · Latest available filing year: 2020 · Primary form: IRS Form 990-N

  44. Aragon High School Athletic Boosters

    EIN 465537707 · Headquarters: SAN MATEO, CA, USA · Recreation & Sports · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  45. Aragon High School Drama Boosters

    EIN 800674452 · Headquarters: SAN MATEO, CA, USA · Education · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  46. Aragon High School Music Boosters

    EIN 943253130 · Headquarters: SAN MATEO, CA, USA · Education · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  47. Aragon High School Ptso Inc

    EIN 260186824 · Headquarters: SAN MATEO, CA, USA · Education · Latest available filing year: 2024 · Primary form: IRS Form 990

  48. Aragon Homeowners Association

    EIN 202480854 · Headquarters: San Mateo, CA, US · Housing & Shelter · Latest available filing year: 2015 · Primary form: IRS Form 990-N

  49. Aragon Robotics Booster Inc

    EIN 331536045 · Headquarters: San Mateo, CA, USA · Education · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  50. Art of Healing

    EIN 301336697 · Headquarters: SAN MATEO, CA, US · Mental Health & Crisis Intervention · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  51. Asian American Curriculum Project Inc

    EIN 237062678 · Headquarters: San Mateo, CA, US · International, Foreign Affairs & National Security · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  52. Asian Uplift

    EIN 871197118 · Headquarters: San Mateo, CA, US · Civil Rights, Social Action & Advocacy · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  53. Asiya Santa Cruz Shrine Club

    EIN 901665422 · Headquarters: SAN MATEO, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  54. Asiya Shriners

    EIN 940283410 · Headquarters: SAN MATEO, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  55. Asiya Shriners Group Returns

    EIN 510154784 · Headquarters: SAN MATEO, CA, USA · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-EZ

  56. Assistance League of San Mateo County

    EIN 941347022 · Headquarters: SAN MATEO, CA, USA · Human Services · Latest available filing year: 2024 · Primary form: IRS Form 990

  57. Association for Women in Science Inc

    EIN 270955566 · Headquarters: San Mateo, CA, US · Unknown & Unclassified · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  58. Association for Women in Science Inc

    EIN 394502695 · Headquarters: San Mateo, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  59. Association for Women in Science Inc

    EIN 521408810 · Headquarters: San Mateo, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  60. Association for Women in Science Inc

    EIN 901139833 · Headquarters: San Mateo, CA, US · Science & Technology · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  61. Autism Society of San Francisco Bay Area

    EIN 942978690 · Headquarters: San Mateo, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  62. Auxiliary Services San Mateo County

    EIN 946080505 · Headquarters: SAN MATEO, CA, USA · Education · Latest available filing year: 2012 · Primary form: IRS Form 990

  63. Ayadi

    EIN 263009681 · Headquarters: SAN MATEO, CA, US · Education · Latest available filing year: 2020 · Primary form: IRS Form 990-N

  64. B Street San Mateo Amateur Boxing Club

    EIN 464692886 · Headquarters: San Mateo, CA, USA · Recreation & Sports · Latest available filing year: 2018 · Primary form: IRS Form 990

  65. Bairex Corp

    EIN 883515603 · Headquarters: San Mateo, CA, USA · Education · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  66. Balance Food and Fun Inc

    EIN 263297899 · Headquarters: San Mateo, CA, US · Education · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  67. Basil Technologies Inc

    EIN 821148094 · Headquarters: SAN MATEO, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  68. Bay Area Cancer Connections

    EIN 770417605 · Headquarters: SAN MATEO, CA, USA · Diseases, Disorders & Medical Disciplines · Latest available filing year: 2024 · Primary form: IRS Form 990

  69. Bay Area Charter Schools Athletic Conference

    EIN 270526606 · Headquarters: SAN MATEO, CA, USA · Education · Latest available filing year: 2024 · Primary form: IRS Form 990

  70. Bay Area Jazz Inc

    EIN 273643618 · Headquarters: San Mateo, CA, US · Arts, Culture & Humanities · Latest available filing year: 2012 · Primary form: IRS Form 990-N

  71. Bay Area Robotics Network

    EIN 393598975 · Headquarters: San Mateo, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  72. Bay Area Self Defense Association

    EIN 260174904 · Headquarters: San Mateo, CA, US · Crime & Legal Related · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  73. Bay Area Senior Services Inc

    EIN 943008774 · Headquarters: SAN MATEO, CA, USA · Housing & Shelter · Latest available filing year: 2023 · Primary form: IRS Form 990

  74. Bay Ocean District California Garden Clubs Inc

    EIN 383821176 · Headquarters: San Mateo, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  75. Baywood Owners Improvement Association

    EIN 237267294 · Headquarters: San Mateo, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  76. Beilin-makagon Art Foundation

    EIN 853823361 · Headquarters: SAN MATEO, CA, USA · Arts, Culture & Humanities · Latest available filing year: 2024 · Primary form: IRS Form 990-PF

  77. Benevolent and Protective Order of Elks 1112 Building Inc

    EIN 940317300 · Headquarters: SAN MATEO, CA, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  78. Beresford-hillsdale Homeowners Association

    EIN 943126520 · Headquarters: San Mateo, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  79. Beyond Bars Coaching

    EIN 331514564 · Headquarters: San Mateo, CA, US · Human Services · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  80. Beyond Type 1

    EIN 473336640 · Headquarters: SAN MATEO, CA, USA · Health Care · Latest available filing year: 2024 · Primary form: IRS Form 990

  81. Bioneomed Research Foundation

    EIN 832326718 · Headquarters: San Mateo, CA, USA · Medical Research · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  82. Birds Of Life Foundation

    EIN 831071267 · Headquarters: San Mateo, CA, USA · Human Services · Latest available filing year: 2023 · Primary form: IRS Form 990-EZ

  83. Black Parents Association of the San Mateo Union High School Distri

    EIN 472373277 · Headquarters: SAN MATEO, CA, US · Education · Latest available filing year: 2020 · Primary form: IRS Form 990-N

  84. Blockchain by Women

    EIN 831984602 · Headquarters: San Mateo, CA, US · Science & Technology · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  85. Blue Banner Volleyball

    EIN 923267104 · Headquarters: SAN MATEO, CA, USA · Recreation & Sports · Latest available filing year: 2025 · Primary form: IRS Form 990

  86. Blume Foundation

    EIN 946073163 · Headquarters: SAN MATEO, CA, USA · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-PF

  87. Bohannon Foundation

    EIN 946102535 · Headquarters: SAN MATEO, CA, USA · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-PF

  88. Borel Middle School Pta

    EIN 942644497 · Headquarters: SAN MATEO, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  89. Brazilian Women Collective Inc

    EIN 853074623 · Headquarters: San Mateo, CA, US · Human Services · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  90. Bridges-puentes Inc

    EIN 205238231 · Headquarters: San Mateo, CA, US · Religion Related · Latest available filing year: 2013 · Primary form: IRS Form 990-N

  91. Bridging Tech Charitable Fund

    EIN 851031712 · Headquarters: SAN MATEO, CA, USA · Human Services · Latest available filing year: 2024 · Primary form: IRS Form 990

  92. Broadcast Legends

    EIN 680374656 · Headquarters: San Mateo, CA, US · Recreation & Sports · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  93. Bunker Hill Parents Participation Nurser

    EIN 946034305 · Headquarters: SAN MATEO, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  94. Burlingame-san Mateo Soroptimist Foundation Inc

    EIN 943190103 · Headquarters: San Mateo, CA, US · Community Improvement & Capacity Building · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  95. Butimar Productions

    EIN 912165702 · Headquarters: San Mateo, CA, US · Arts, Culture & Humanities · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  96. Cactus Sinclair Corp

    EIN 208035997 · Headquarters: SAN MATEO, CA, USA · Community Improvement & Capacity Building · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  97. California Bombers Fast Pitch Sb

    EIN 464771682 · Headquarters: SAN MATEO, CA, USA · Recreation & Sports · Latest available filing year: 2018 · Primary form: IRS Form 990-EZ

  98. California Clubhouse DBA Aspire House

    EIN 462909253 · Headquarters: San Mateo, CA, USA · Mental Health & Crisis Intervention · Latest available filing year: 2024 · Primary form: IRS Form 990

  99. California Goldrush Softball Association

    EIN 203539737 · Headquarters: San Mateo, CA, US · Recreation & Sports · Latest available filing year: 2010 · Primary form: IRS Form 990-N

  100. California League for Nursing

    EIN 941244834 · Headquarters: SAN MATEO, CA, USA · Health Care · Latest available filing year: 2014 · Primary form: IRS Form 990-EZ

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