Unknown & Unclassified nonprofits in Maryland

Unknown & Unclassified nonprofits in Maryland. Browse 10,672 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 Theta Tau Inc

    EIN 363479085 · Headquarters: Towson, MD, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  2. Sigma Xi the Scientific Research Society of North America-universit

    EIN 237272291 · Headquarters: Baldwin, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  3. Sigmund M Hyman Foundation Inc

    EIN 526034760 · Headquarters: BALTIMORE, MD, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-PF

  4. Sign Language Research Inc

    EIN 521156661 · Headquarters: Bowie, MD, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  5. Signs and Wonders Gospel Ministries

    EIN 203483128 · Headquarters: CUMBERLAND, MD, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  6. Sile Tiwlid

    EIN 931380222 · Headquarters: Silver Spring, MD, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  7. Silent Rank Sisterhood Inc

    EIN 364727772 · Headquarters: Edgewater, MD, US · Unknown & Unclassified · Latest available filing year: 2012 · Primary form: IRS Form 990-N

  8. Sillery Bay Hunters Harbor Civic and Recreation Association Inc

    EIN 521141996 · Headquarters: PASADENA, MD, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  9. Silver Spring Heritage Inc

    EIN 521662393 · Headquarters: Silver Spring, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  10. Silver Spring Lions Club Foundation

    EIN 521835867 · Headquarters: SILVER SPRING, MD, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-PF

  11. Silver Spring Md Chapter Links Inc

    EIN 521701632 · Headquarters: SILVER SPRING, MD, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  12. Silver Spring Stage Incorporated

    EIN 237333993 · Headquarters: Silver Spring, MD, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  13. Silver Spring Takoma Park Mutual Aid

    EIN 863798454 · Headquarters: Silver Spring, MD, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  14. Silver Triangle Ruritan Foundation Inc

    EIN 521644937 · Headquarters: DAVIDSONVILLE, MD, US · Unknown & Unclassified · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  15. Simga Alpha Epsilon Md Omicron Pi

    EIN 471693462 · Headquarters: Baltimore, MD, US · Unknown & Unclassified · Latest available filing year: 2014 · Primary form: IRS Form 990-N

  16. Simone Weil Center for Political Philosophy Inc

    EIN 822725040 · Headquarters: Kensington, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  17. Simply Fit Inc

    EIN 830906198 · Headquarters: Bowie, MD, US · Unknown & Unclassified · Latest available filing year: 2020 · Primary form: IRS Form 990-N

  18. Sindhi Association of North America

    EIN 133698207 · Headquarters: Gaithersburg, MD, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-PF

  19. Single Parent Residence Program Inc

    EIN 205017601 · Headquarters: Mitchellville, MD, US · Unknown & Unclassified · Latest available filing year: 2011 · Primary form: IRS Form 990-N

  20. Single Parent Superstars Inc

    EIN 862965576 · Headquarters: CLARKSBURG, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  21. Singles on Sailboats Inc

    EIN 521278284 · Headquarters: Annapolis, MD, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  22. Sissen Inc

    EIN 833757094 · Headquarters: randallstown, MD, US · Unknown & Unclassified · Latest available filing year: 2018 · Primary form: IRS Form 990-N

  23. Sister Network

    EIN 464941485 · Headquarters: BOWIE, MD, US · Unknown & Unclassified · Latest available filing year: 2014 · Primary form: IRS Form 990-N

  24. Sisters by Heart Ministries

    EIN 473471524 · Headquarters: Indian Head, MD, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  25. Sisters Helping Sisters Empowerment Center Inc

    EIN 471865791 · Headquarters: Glen Burnie, MD, US · Unknown & Unclassified · Latest available filing year: 2014 · Primary form: IRS Form 990-N

  26. Sisters of Charity of St Charles Borromeoincc/o Sister Hadiwijana

    EIN 521904933 · Headquarters: SILVER SPRING, MD, USA · Unknown & Unclassified · Latest available filing year: 2015 · Primary form: IRS Form 990-EZ

  27. Sisters Without Borders

    EIN 852530943 · Headquarters: Potomac, MD, US · Unknown & Unclassified · Latest available filing year: 2019 · Primary form: IRS Form 990-N

  28. Skilf Inc

    EIN 463400415 · Headquarters: CHEVY CHASE, MD, USA · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-EZ

  29. Slate Ridge American Legion Post No 182

    EIN 520568938 · Headquarters: WHITEFORD, MD, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  30. Sligo Creek Elementary School Pta

    EIN 522139334 · Headquarters: SILVER SPRING, MD, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  31. Small Axe Society

    EIN 473038132 · Headquarters: Baltimore, MD, US · Unknown & Unclassified · Latest available filing year: 2014 · Primary form: IRS Form 990-N

  32. Small Zones of Peace Inc

    EIN 843827428 · Headquarters: Knoxville, MD, US · Unknown & Unclassified · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  33. Smart Samaritans Inc

    EIN 871950044 · Headquarters: ELLICOTT CITY, MD, US · Unknown & Unclassified · Latest available filing year: 2021 · Primary form: IRS Form 990-N

  34. Smith Island United Inc

    EIN 474841525 · Headquarters: EWELL, MD, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  35. Smithsburg Elementary School Pta Inc

    EIN 237030786 · Headquarters: SMITHSBURG, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  36. Smithsburg Historical Society Incorporated

    EIN 521485480 · Headquarters: Smithsburg, MD, US · Unknown & Unclassified · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  37. Smocking Arts Guild of America Inc

    EIN 521869071 · Headquarters: Millersville, MD, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  38. Smocking Arts Guild of America Inc

    EIN 562601268 · Headquarters: Bowie, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  39. Smocking Arts Guild of America Inc

    EIN 581859893 · Headquarters: Crofton, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  40. Smoketown Rotary Club of Brunswick Maryland

    EIN 813769264 · Headquarters: Brunswick, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  41. Smuck Foundation Inc

    EIN 526054758 · Headquarters: BALTIMORE, MD, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-PF

  42. Snow Hill Area Chamber of Commerce Inc

    EIN 521544574 · Headquarters: Snow Hill, MD, US · Unknown & Unclassified · Latest available filing year: 2018 · Primary form: IRS Form 990-N

  43. Snowden Farm Elementary School Pta

    EIN 842276666 · Headquarters: CLARKSBURG, MD, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  44. Soar Foundation Inc

    EIN 471132464 · Headquarters: Waldorf, MD, US · Unknown & Unclassified · Latest available filing year: 2015 · Primary form: IRS Form 990-N

  45. Soccer Assoc for Youth Central Maryland Soccer Assoc Say

    EIN 542082583 · Headquarters: BALTIMORE, MD, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  46. Society for Applied Spectroscopy

    EIN 529900013 · Headquarters: Greenblet, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  47. Society for Cryobiology Inc (C/o Paracorp)

    EIN 526066101 · Headquarters: BALTIMORE, MD, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  48. Society for Czechoslovak Philately

    EIN 521302521 · Headquarters: Owings Mills, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  49. Society for Higher Rabbinical Studies

    EIN 521110636 · Headquarters: BALTIMORE, MD, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  50. Society for Leukocyte Biology

    EIN 237025568 · Headquarters: SILVER SPRING, MD, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  51. Society for Marketing Professional Services

    EIN 521625846 · Headquarters: Baltimore, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  52. Society for Preservation & Encourmt of Barbershop Quartet Singing Amer

    EIN 521148751 · Headquarters: Fallston, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  53. Society for Preservation & Encourmt of Barbershop Quartet Singing Amer

    EIN 521219861 · Headquarters: Reisterstown, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  54. Society for Preservation & Encourmt of Barbershop Quartet Singing Amer

    EIN 521967353 · Headquarters: Oxford, MD, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  55. Society for Preservation & Encourmt of Barbershop Quartet Singing Amer

    EIN 526055297 · Headquarters: Clear Spring, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  56. Society for Preservation & Encourmt of Barbershop Quartet Singing Amer

    EIN 562447109 · Headquarters: Waldorf, MD, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  57. Society for Preservation & Encourmt of Barbershop Quertet Singing Amer

    EIN 272484935 · Headquarters: Germantown, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  58. Society for Preservation & Encrgmnt of Barbershop Quartet Singing Amer

    EIN 237010998 · Headquarters: Pasadena, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  59. Society for Preservation & Encrgmnt of Barbershop Quartet Singing Amer

    EIN 237015722 · Headquarters: Frederick, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  60. Society for Preservation & Encrgmnt of Barbershop Quartet Singing Amer

    EIN 521158395 · Headquarters: Cumberland, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  61. Society for Preservation & Encrgmnt of Barbershop Quartet Singing Amer

    EIN 521277834 · Headquarters: Finksburg, MD, US · Unknown & Unclassified · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  62. Society for Quality Urologic Care

    EIN 264000065 · Headquarters: Owings Mills, MD, US · Unknown & Unclassified · Latest available filing year: 2010 · Primary form: IRS Form 990-N

  63. Society for the Fulfillment of Living Inc

    EIN 521242293 · Headquarters: Baltimore, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  64. Society for the History of the Germans in Maryland

    EIN 526057226 · Headquarters: Columbia, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  65. Society for the Scientific Study of Religion

    EIN 066070053 · Headquarters: GERMANTOWN, MD, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  66. Society of Airway Pioneers

    EIN 956095726 · Headquarters: Chestertown, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  67. Society of American Military Engineers

    EIN 260117439 · Headquarters: Frederick, MD, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  68. Society of American Military Engineers Baltimore Post

    EIN 526011682 · Headquarters: COLUMBIA, MD, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  69. Society of Cosmetic Chemists

    EIN 521398221 · Headquarters: Hanover, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  70. Society of Critical Care Medicine

    EIN 263661478 · Headquarters: Baltimore, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  71. Society of Fire Protection Engineers

    EIN 061059016 · Headquarters: College Park, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  72. Society of Fire Protection Engineers - Umd Student Chapter Ll

    EIN 870944599 · Headquarters: College Park, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  73. Society of Fire Protection Engineers Inc

    EIN 046108834 · Headquarters: Gaithersburg, MD, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  74. Society of Health and Physical Educators

    EIN 521071317 · Headquarters: Manchester, MD, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  75. Society of Manufacturing Engineers

    EIN 994869259 · Headquarters: Gaithersburg, MD, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  76. Society of Market Technicians

    EIN 521741638 · Headquarters: Silver Spring, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  77. Society of Mayflower Descendants in the State of Maryland

    EIN 526054808 · Headquarters: Chesapeake Beach, MD, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  78. Society of Musiccrafters

    EIN 521689330 · Headquarters: Rockville, MD, US · Unknown & Unclassified · Latest available filing year: 2020 · Primary form: IRS Form 990-N

  79. Society of Professional Benefit Administrators

    EIN 521156864 · Headquarters: CHEVY CHASE, MD, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  80. Society of Professional Journalists

    EIN 311468429 · Headquarters: Colllege PArk, MD, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  81. Society of Sons of the Revolution in the State of Maryland

    EIN 526075608 · Headquarters: Pasadena, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  82. Society of St Vincent De Paul Baltimore Council Inc

    EIN 461109791 · Headquarters: Thurmont, MD, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  83. Society of St Vincent De Paul Baltimore Council Inc

    EIN 471315592 · Headquarters: Baltimore, MD, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  84. Society of St Vincent De Paul Baltimore Council Inc

    EIN 471528971 · Headquarters: COLUMBIA, MD, US · Unknown & Unclassified · Latest available filing year: 2020 · Primary form: IRS Form 990-N

  85. Society of St Vincent De Paul Baltimore Council Inc

    EIN 852863110 · Headquarters: Parkville, MD, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  86. Society of St Vincent De Paul Baltimore Council Inc

    EIN 853847995 · Headquarters: Baltimore, MD, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  87. Society of St Vincent De Paul Baltimore Council Inc

    EIN 854113983 · Headquarters: Baltimore, MD, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  88. Society of St Vincent De Paul Baltimore Council Inc

    EIN 854309691 · Headquarters: RANDALLSTOWN, MD, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  89. Society of St Vincent De Paul Baltimore Council Inc

    EIN 901899153 · Headquarters: Glen Burnie, MD, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  90. Society of St Vincent De Paul Resurrection-St Paul Conference

    EIN 461411668 · Headquarters: Ellicott City, MD, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  91. Society of St Vincent De Paul St Johns Conference

    EIN 830737125 · Headquarters: SEVERNA PARK, MD, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  92. Society of St Vincent De Paul St Joseph Sykesville Conference

    EIN 844186386 · Headquarters: SYKESVILLE, MD, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  93. Society of St Vincent Depaul Baltimore Council Inc

    EIN 461250614 · Headquarters: Arnold, MD, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  94. Society of St Vincent Depaul Baltimore Council Inc

    EIN 822883154 · Headquarters: MIDDLETOWN, MD, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  95. Society of St Vincent Depaul Baltimore Council Inc

    EIN 852918778 · Headquarters: DAVIDSONVILLE, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  96. Society of the Fifth Division

    EIN 366118376 · Headquarters: Easton, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  97. Society of the War of 1812 in the State of Maryland of Baltimore

    EIN 520789954 · Headquarters: Columbia, MD, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  98. Society of Women Engineers

    EIN 521722609 · Headquarters: Baltimore, MD, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  99. Socty of Gyne Nurse Oncologists

    EIN 840904554 · Headquarters: SEVERNA PARK, MD, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  100. Sogaa Inc

    EIN 471735622 · Headquarters: Baltimore, MD, US · Unknown & Unclassified · Latest available filing year: 2015 · Primary form: IRS Form 990-N

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