Unknown & Unclassified nonprofits

Unknown & Unclassified nonprofits. Browse 557,756 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. Siefer Charitable Tua Xxx-xx-xxxx

    EIN 426055997 · Headquarters: TAMPA, FL, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-PF

  2. Sieff Family Foundation

    EIN 237011890 · Headquarters: MINNEAPOLIS, MN, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-PF

  3. Siegel JCC

    EIN 510075823 · Headquarters: WILMINGTON, DE, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  4. Sieger Bibliotheque Inc The

    EIN 475007248 · Headquarters: BRONX, NY, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-PF

  5. Siegfried and Marjorie Claussner Foundation

    EIN 363774034 · Headquarters: ROSELLE, IL, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-PF

  6. Siegfried Crandall Pc Employee Benefit Plan and Trust

    EIN 382453507 · Headquarters: PORTAGE, MI, USA · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-EZ

  7. Siegmund & Marilyn Goldman Charitable Trust

    EIN 596972137 · Headquarters: MAITLAND, FL, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-PF

  8. Siegmund and Irma Rosenthal Foundation Inc

    EIN 133764063 · Headquarters: SPRING VALLEY, NY, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-PF

  9. Siemer Foundation

    EIN 311260542 · Headquarters: NEW ALBANY, OH, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-PF

  10. Siena College PAD Prelaw Chapter

    EIN 271709396 · Headquarters: TOWSON, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  11. Sienna & Schuyler Foundation

    EIN 464205491 · Headquarters: Brooklyn, NY, US · Unknown & Unclassified · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  12. Sienna Bruins

    EIN 931387289 · Headquarters: Missouri City, TX, USA · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-EZ

  13. Sienna Plantation Community Association Inc

    EIN 383953483 · Headquarters: Missouri City, TX, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  14. Sierra Access Coalition

    EIN 261191802 · Headquarters: SACRAMENTO, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  15. Sierra Amateur Radio Club

    EIN 953377283 · Headquarters: Ridgecrest, CA, US · Unknown & Unclassified · Latest available filing year: 2021 · Primary form: IRS Form 990-N

  16. Sierra Arthritis Foundation

    EIN 770194553 · Headquarters: IRVINE, CA, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-PF

  17. Sierra Artists Cooperative

    EIN 275023678 · Headquarters: MARIPOSA, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  18. Sierra Association of Foster Families

    EIN 943136848 · Headquarters: Dayton, NV, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  19. Sierra Bella Mutual Water Company

    EIN 952380391 · Headquarters: WOFFORD HEIGHTS, CA, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  20. Sierra Boys Choir

    EIN 814793543 · Headquarters: RENO, NV, US · Unknown & Unclassified · Latest available filing year: 2020 · Primary form: IRS Form 990-N

  21. Sierra Buena Sacred Circle

    EIN 841173408 · Headquarters: Colorado Springs, CO, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  22. Sierra Business Park Association

    EIN 472235618 · Headquarters: ROCKLIN, CA, USA · Unknown & Unclassified · Latest available filing year: 2015 · Primary form: IRS Form 990-EZ

  23. Sierra Cascade Family Opportunities

    EIN 680178607 · Headquarters: Quincy, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  24. Sierra Central Credit Union

    EIN 941484851 · Headquarters: Yuba City, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  25. Sierra Chaplaincy

    EIN 930786513 · Headquarters: PLACERVILLE, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  26. Sierra Chapter American Theatre Organ Society

    EIN 237018083 · Headquarters: Fair Oaks, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  27. Sierra Child and Family Services Inc

    EIN 680166134 · Headquarters: DIAMOND SPRINGS, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  28. Sierra City Fire Dept Auxiliary

    EIN 941700489 · Headquarters: Sierra City, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  29. Sierra Club

    EIN 941153307 · Headquarters: OAKLAND, CA, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  30. Sierra Club California Statewide Ballot Measures Committee

    EIN 471386385 · Headquarters: Sacramento, CA, US · Unknown & Unclassified · Latest available filing year: 2015 · Primary form: IRS Form 990-N

  31. Sierra Club Nevada PAC

    EIN 813881275 · Headquarters: Reno, NV, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  32. Sierra College Faculty Association

    EIN 680008035 · Headquarters: ROCKLIN, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  33. Sierra County Genealogical Society

    EIN 900608399 · Headquarters: truth or consequences, NM, US · Unknown & Unclassified · Latest available filing year: 2021 · Primary form: IRS Form 990-N

  34. Sierra County Historical Society

    EIN 850220497 · Headquarters: Truth Or Consequences, NM, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  35. Sierra County Salon 492

    EIN 850414607 · Headquarters: Deming, NM, US · Unknown & Unclassified · Latest available filing year: 2008 · Primary form: IRS Form 990-N

  36. Sierra Dachshund Breeders Club Of

    EIN 832639576 · Headquarters: CABAZON, CA, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  37. Sierra Electric Cooperative Education Foundation

    EIN 850352648 · Headquarters: ELEPHANT BUTTE, NM, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-PF

  38. Sierra Electric Cooperative Inc

    EIN 850093694 · Headquarters: ELEPHANT BUTTE, NM, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  39. Sierra Environmental Social Service

    EIN 262458058 · Headquarters: Hayward, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  40. Sierra Estate Property Owners Association

    EIN 237151782 · Headquarters: Weimar, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  41. Sierra Express Bicycle Club of Nevada County

    EIN 884321082 · Headquarters: Grass Valley, CA, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  42. Sierra Family Medical Clinic Inc

    EIN 680320801 · Headquarters: Nevada City, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  43. Sierra Flight No 27 Order of Daedalians

    EIN 680049072 · Headquarters: Lincoln, CA, US · Unknown & Unclassified · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  44. Sierra Foothills Amateur Radio Club

    EIN 680038930 · Headquarters: Auburn, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  45. Sierra Foothills Audubon Society

    EIN 942770544 · Headquarters: GRASS VALLEY, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  46. Sierra Foothills Community Club

    EIN 942402262 · Headquarters: Squaw Valley, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  47. Sierra Foothills Cycling Club

    EIN 271215785 · Headquarters: Auburn, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  48. Sierra Foothills R-c Flyers Inc

    EIN 680202025 · Headquarters: AUBURN, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  49. Sierra Ghost Riders Horse Club

    EIN 300489835 · Headquarters: Lincoln, CA, US · Unknown & Unclassified · Latest available filing year: 2018 · Primary form: IRS Form 990-N

  50. Sierra Golf Flyers

    EIN 841013266 · Headquarters: ARVADA, CO, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  51. Sierra Grande Estates Mutual Water

    EIN 953221856 · Headquarters: BISHOP, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  52. Sierra Health Foundation Community Development Corporation

    EIN 850896763 · Headquarters: SACRAMENTO, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  53. Sierra High School Athletic Boosters Club

    EIN 680363413 · Headquarters: Manteca, CA, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  54. Sierra Highlands Vintner Group

    EIN 612217758 · Headquarters: PLACERVILLE, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  55. Sierra Hills Swim & Racquet Cl

    EIN 952829236 · Headquarters: CANYON COUNTRY, CA, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  56. Sierra Historic Sites Association

    EIN 237037395 · Headquarters: Oakhurst, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  57. Sierra Hotel Aeronautics Group Inc

    EIN 994645883 · Headquarters: PEACHTREE CITY, GA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  58. Sierra Hotel for Dd214s

    EIN 934328265 · Headquarters: Sanford, NC, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  59. Sierra House Inc

    EIN 990278492 · Headquarters: HONOLULU, HI, USA · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-EZ

  60. Sierra Leone Cultural Organization Inc

    EIN 222603200 · Headquarters: Roslindale, MA, US · Unknown & Unclassified · Latest available filing year: 2019 · Primary form: IRS Form 990-N

  61. Sierra Life Churh

    EIN 822243057 · Headquarters: Sierra Vista, AZ, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  62. Sierra Linda Neighborhood Council Watch

    EIN 770357854 · Headquarters: Oxnard, CA, US · Unknown & Unclassified · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  63. Sierra Madre Alliance Inc

    EIN 860654061 · Headquarters: ORO VALLEY, AZ, USA · Unknown & Unclassified · Latest available filing year: 2019 · Primary form: IRS Form 990

  64. Sierra Madre Elementary Pta

    EIN 956207399 · Headquarters: SIERRA MADRE, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  65. Sierra Madre Fire Safe Council Inc

    EIN 205458739 · Headquarters: SIERRA MADRE, CA, USA · Unknown & Unclassified · Latest available filing year: 2011 · Primary form: IRS Form 990-EZ

  66. Sierra Madre Garden Club

    EIN 680025524 · Headquarters: Plymouth, CA, US · Unknown & Unclassified · Latest available filing year: 2021 · Primary form: IRS Form 990-N

  67. Sierra Madre Historical Preservation Society

    EIN 956248485 · Headquarters: SIERRA MADRE, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  68. Sierra Madre Little League

    EIN 954511681 · Headquarters: SIERRA MADRE, CA, USA · Unknown & Unclassified · Latest available filing year: 2020 · Primary form: IRS Form 990-EZ

  69. Sierra Madre Mountain Conservancy

    EIN 954266904 · Headquarters: Sierra Madre, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  70. Sierra Madre Neighbors for Fairness

    EIN 881911149 · Headquarters: San Rafael, CA, USA · Unknown & Unclassified · Latest available filing year: 2022 · Primary form: IRS Form 990-EZ

  71. Sierra Madre Pioneer Cemetery Association

    EIN 956141275 · Headquarters: SIERRA MADRE, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  72. Sierra Madre Professional Firefighters Association

    EIN 834526754 · Headquarters: SIERRA MADRE, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  73. Sierra Madre Radio Controlled Modelers

    EIN 954050680 · Headquarters: Duarte, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  74. Sierra Marlins Swim Team

    EIN 680032838 · Headquarters: FOLSOM, CA, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  75. Sierra Masonic Center Association

    EIN 510676791 · Headquarters: Oakhurst, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  76. Sierra Masonic Family Club

    EIN 770007267 · Headquarters: MORRO BAY, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  77. Sierra Meadowlarks Inc

    EIN 260339931 · Headquarters: Oakhurst, CA, US · Unknown & Unclassified · Latest available filing year: 2020 · Primary form: IRS Form 990-N

  78. Sierra Mental Wellness Group

    EIN 237249387 · Headquarters: ROSEVILLE, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  79. Sierra Mountain Youth Football

    EIN 823752834 · Headquarters: Placerville CA, CA, US · Unknown & Unclassified · Latest available filing year: 2018 · Primary form: IRS Form 990-N

  80. Sierra Nevada Academy Charter School

    EIN 371867343 · Headquarters: RENO, NV, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  81. Sierra Nevada Amateur Radio Society Inc

    EIN 880184611 · Headquarters: Reno, NV, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  82. Sierra Nevada Association of Paralegals

    EIN 880344597 · Headquarters: Reno, NV, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  83. Sierra Nevada Balalaika Society Inc

    EIN 880305788 · Headquarters: RENO, NV, US · Unknown & Unclassified · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  84. Sierra Nevada Cares

    EIN 332911899 · Headquarters: Reno, NV, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  85. Sierra Nevada Chapter Military Officers Association of America

    EIN 942674871 · Headquarters: Reno, NV, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  86. Sierra Nevada Golf Course Superintendents Association

    EIN 680181455 · Headquarters: CLOVIS, CA, USA · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-EZ

  87. Sierra Nevada Region Porsche Club of America Inc

    EIN 262746548 · Headquarters: Reno, NV, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  88. Sierra Nevada Retriever Club Inc

    EIN 880304278 · Headquarters: Reno, NV, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  89. Sierra Oaks Soccer Club

    EIN 680049030 · Headquarters: Sacramento, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  90. Sierra Oasis of Hope Inc

    EIN 922208374 · Headquarters: Tampa, FL, USA · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-EZ

  91. Sierra Old Timers Motorcycle Club

    EIN 942662548 · Headquarters: Rocklin, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  92. Sierra Pacific Educational Adventures

    EIN 680317864 · Headquarters: Vacaville, CA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  93. Sierra Pacific Flyfishers Incorporated

    EIN 953622493 · Headquarters: Van Nuys, CA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  94. Sierra Pacific Foundation

    EIN 942574178 · Headquarters: REDDING, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-PF

  95. Sierra Pacific Power Medical and Dental Plan Trust

    EIN 886033779 · Headquarters: RENO, NV, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  96. Sierra Paint Horse Club Inc

    EIN 680015109 · Headquarters: Wilton, CA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  97. Sierra Partnership for Advanced Wil Dfire Detection

    EIN 394926180 · Headquarters: Incline Village, NV, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  98. Sierra Pines Road Improvement Group

    EIN 237315611 · Headquarters: Pioneer, CA, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  99. Sierra Preschool

    EIN 941560198 · Headquarters: Auburn, CA, USA · Unknown & Unclassified · Latest available filing year: 2015 · Primary form: IRS Form 990-EZ

  100. Sierra Road Improvement Association

    EIN 946104511 · Headquarters: SAN JOSE, CA, USA · Unknown & Unclassified · Latest available filing year: 2020 · Primary form: IRS Form 990

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