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. On Our Own of Montgomery County Inc

    EIN 521366329 · Headquarters: GERMANTOWN, MD, US · Unknown & Unclassified · Latest available filing year: 2021 · Primary form: IRS Form 990-N

  2. On Our Own of Prince George's County Incorporated

    EIN 521778955 · Headquarters: HYATTSVILLE, MD, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  3. On the Heels of Greatness Inc

    EIN 202857584 · Headquarters: Baltimore, MD, US · Unknown & Unclassified · Latest available filing year: 2008 · Primary form: IRS Form 990-N

  4. On the Rock Athletics Inc

    EIN 853720479 · Headquarters: Linthicum Heights, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  5. One Twelve West Inc

    EIN 521097702 · Headquarters: BALTIMORE, MD, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  6. One World One Family Act Inc

    EIN 994014732 · Headquarters: Potomac, MD, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  7. Oodua Progressive Union

    EIN 465340168 · Headquarters: baltimore, MD, US · Unknown & Unclassified · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  8. Opa Health Inc

    EIN 851944812 · Headquarters: Ellicott City, MD, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  9. Open Door Community Center of Hope and Restoration Inc

    EIN 753157170 · Headquarters: bowie, MD, US · Unknown & Unclassified · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  10. Operating Engineers Local 77 Apprentice C/o Associated Administrators Inc

    EIN 526053812 · Headquarters: SPARKS, MD, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  11. Operating Engineers Local No 37 Apprenticeship and Training Fund

    EIN 520893636 · Headquarters: BALTIMORE, MD, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  12. Operating Engineers Local No 37 Health & Welfare Fund

    EIN 526039006 · Headquarters: BALTIMORE, MD, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  13. Operating Engineers Trust Fund of Wash Dc and Vic C/o Associated Administrtors

    EIN 526038508 · Headquarters: SPARKS, MD, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  14. Operation Organize

    EIN 851358256 · Headquarters: District Heights, MD, US · Unknown & Unclassified · Latest available filing year: 2021 · Primary form: IRS Form 990-N

  15. Operative Plasterers' & Cement Masons' International Association

    EIN 530258484 · Headquarters: COLUMBIA, MD, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  16. Opportunities Inc

    EIN 520857131 · Headquarters: LANHAM, MD, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  17. Opportunity Builders Assoc of Parents Inc

    EIN 521159823 · Headquarters: Pasadena, MD, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  18. Optimist Club of Cockeysville Inc

    EIN 200802356 · Headquarters: Cockeysville, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  19. Optimist Club of Frederick Optimist Club of Frederick

    EIN 526062682 · Headquarters: MYERSVILLE, MD, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  20. Optimist International

    EIN 237007976 · Headquarters: Bushwood, MD, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  21. Optimist International

    EIN 237010636 · Headquarters: Crownsville, MD, US · Unknown & Unclassified · Latest available filing year: 2020 · Primary form: IRS Form 990-N

  22. Optimist International

    EIN 237396548 · Headquarters: Pasadena, MD, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  23. Optimist International

    EIN 472084621 · Headquarters: Chester, MD, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  24. Optimist International

    EIN 475235509 · Headquarters: Ridgely, MD, US · Unknown & Unclassified · Latest available filing year: 2020 · Primary form: IRS Form 990-N

  25. Optimist International

    EIN 521275007 · Headquarters: Mechanicsville, MD, US · Unknown & Unclassified · Latest available filing year: 2019 · Primary form: IRS Form 990-N

  26. Optimist International

    EIN 521363332 · Headquarters: Phoenix, MD, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  27. Optimist International

    EIN 526046228 · Headquarters: Salisbury, MD, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  28. Optimist International

    EIN 526048973 · Headquarters: OLNEY, MD, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  29. Optimist International

    EIN 526083645 · Headquarters: Prince Frederick, MD, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  30. Optimist International

    EIN 831198572 · Headquarters: Mechanicsville, MD, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  31. Optimist International

    EIN 921418082 · Headquarters: WALDOR, MD, US · Unknown & Unclassified · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  32. Optimist International 33097 Oc of Westminster Gamber

    EIN 237008717 · Headquarters: FINKSBURG, MD, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  33. Optimist International 33211 Ocean City - Berlin Md

    EIN 237249869 · Headquarters: OCEAN PINES, MD, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  34. Optimist International Carroll County - Freedom District Maryland

    EIN 526062686 · Headquarters: SYKESVILLE, MD, USA · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990

  35. Optimist International Hereford Optimist Club

    EIN 912134751 · Headquarters: MONKTON, MD, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  36. Optimist Interntional

    EIN 823360744 · Headquarters: Salisbury, MD, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  37. Optometric Extension Program Foundation Inc

    EIN 730664688 · Headquarters: TIMONIUM, MD, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  38. Oracle Visions Inc

    EIN 473683360 · Headquarters: Baltimore, MD, US · Unknown & Unclassified · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  39. Orangutan Watch Inc

    EIN 364648456 · Headquarters: Silver Spring, MD, US · Unknown & Unclassified · Latest available filing year: 2010 · Primary form: IRS Form 990-N

  40. Order of Eastern Star of Maryland

    EIN 526043521 · Headquarters: Cockeysville, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  41. Order of Saint Stephen Deacon

    EIN 465362241 · Headquarters: Catonsville, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  42. Order of the Alhambra

    EIN 843137289 · Headquarters: Baltimore, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  43. Order of the Alhambra Charity Fund Inc

    EIN 521571850 · Headquarters: BALTIMORE, MD, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  44. Order of the Alhambrainc

    EIN 526014583 · Headquarters: BALTIMORE, MD, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  45. Order of the Eastern Star of District of Columbia

    EIN 237137966 · Headquarters: ROCKVILLE, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  46. Order of the Eastern Star of District of Columbia

    EIN 237137982 · Headquarters: Silver Spring, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  47. Order of the Eastern Star of District of Columbia

    EIN 530121318 · Headquarters: Silver Spring, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  48. Order of the Eastern Star of Maryland

    EIN 237634989 · Headquarters: Cockeysville, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  49. Order of the Eastern Star of Maryland

    EIN 237634998 · Headquarters: Cockeysville, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  50. Order of the Eastern Star of Maryland

    EIN 237635000 · Headquarters: Cockeysville, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  51. Order of the Eastern Star of Maryland

    EIN 237635004 · Headquarters: Cockeysville, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  52. Order of the Eastern Star of Maryland

    EIN 237635009 · Headquarters: Cockeysville, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  53. Order of the Eastern Star of Maryland

    EIN 237635012 · Headquarters: Cockeysville, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  54. Order of the Eastern Star of Maryland

    EIN 237635032 · Headquarters: Cockeysville, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  55. Order of the Eastern Star of Maryland

    EIN 237635033 · Headquarters: Cockeysville, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  56. Order of the Eastern Star of Maryland

    EIN 237635040 · Headquarters: Cockeysville, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  57. Order of the Eastern Star of Maryland

    EIN 237635041 · Headquarters: Cockeysville, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  58. Order of the Eastern Star of Maryland

    EIN 237635044 · Headquarters: Cockeysville, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  59. Order of the Eastern Star of Maryland

    EIN 237635050 · Headquarters: Cockeysville, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  60. Order of the Eastern Star of Maryland

    EIN 237635054 · Headquarters: Cockeysville, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  61. Order of the Eastern Star of Maryland

    EIN 237635055 · Headquarters: Cockeysville, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  62. Order of the Eastern Star of Maryland

    EIN 237635058 · Headquarters: Cockeysville, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  63. Order of the Eastern Star of Maryland

    EIN 237635060 · Headquarters: Cockeysville, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  64. Order of the Eastern Star of Maryland

    EIN 237635062 · Headquarters: Cockeysville, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  65. Order of the Eastern Star of Maryland

    EIN 237635065 · Headquarters: Cockeysville, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  66. Order of the Eastern Star of Maryland

    EIN 237635071 · Headquarters: Cockeysville, MD, US · Unknown & Unclassified · Latest available filing year: 2021 · Primary form: IRS Form 990-N

  67. Order of the Eastern Star of Maryland

    EIN 237635072 · Headquarters: Cockeysville, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  68. Order of the Eastern Star of Maryland

    EIN 237635077 · Headquarters: Cockeysville, MD, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  69. Order of the Eastern Star of Maryland

    EIN 237635078 · Headquarters: Cockeysville, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  70. Order of the Eastern Star of Maryland

    EIN 237635082 · Headquarters: Cockeysville, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  71. Order of the Eastern Star of Maryland

    EIN 237635083 · Headquarters: Cockeysville, MD, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  72. Order of the Eastern Star of Md Grand Chapter

    EIN 520435078 · Headquarters: COCKEYSVILLE, MD, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  73. Order of the Eastern Star of Md Group Return

    EIN 237123447 · Headquarters: COCKEYSVILLE, MD, USA · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990

  74. Order of the Leaf Inc

    EIN 521699924 · Headquarters: Thurmont, MD, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  75. Order of the White Shrine of Jerusalem

    EIN 237514427 · Headquarters: Catonsville, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  76. Organization of Child Care Directors of Montgomery County Inc

    EIN 521862985 · Headquarters: Rockville, MD, US · Unknown & Unclassified · Latest available filing year: 2010 · Primary form: IRS Form 990-N

  77. Organization of Chinese Americans Inc

    EIN 237441824 · Headquarters: Rockville, MD, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  78. Organization of Sri Lankan Americans for Sri Lanka

    EIN 871320083 · Headquarters: Germantown, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  79. Oriental Pearl Acupuncture Center

    EIN 993839260 · Headquarters: Silver Spring, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  80. Original Final Chapter Mc Est 1983 Inc

    EIN 932172465 · Headquarters: Fallston, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  81. Orphan House and Episcopal Free School Society of All Saints Churc

    EIN 521481019 · Headquarters: Frederick, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  82. Orthopaedic Associates Research Foundation Inc

    EIN 521853631 · Headquarters: BALTIMORE, MD, USA · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990

  83. Oseikrom Charity Foundation Inc

    EIN 392611192 · Headquarters: SILVER SPRING, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  84. Otto Schroedel Foundation

    EIN 521252325 · Headquarters: REISTERSTOWN, MD, USA · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-PF

  85. Our Children Inc

    EIN 800967131 · Headquarters: BALTIMORE, MD, US · Unknown & Unclassified · Latest available filing year: 2013 · Primary form: IRS Form 990-N

  86. Our Community Montessori Cooperative

    EIN 474892366 · Headquarters: Lanham, MD, US · Unknown & Unclassified · Latest available filing year: 2014 · Primary form: IRS Form 990-N

  87. Our Creeks & Conservancy Inc

    EIN 812154232 · Headquarters: ANNAPOLIS, MD, USA · Unknown & Unclassified · Latest available filing year: 2018 · Primary form: IRS Form 990-EZ

  88. Our Daily Bread Employment Centerfund Inc

    EIN 260337599 · Headquarters: Timonium, MD, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  89. Our Energy Moment

    EIN 463589298 · Headquarters: Germantown, MD, USA · Unknown & Unclassified · Latest available filing year: 2020 · Primary form: IRS Form 990-EZ

  90. Our House Inc

    EIN 521679448 · Headquarters: BROOKEVILLE, MD, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  91. Our Lady of the Woods Corporation

    EIN 521011508 · Headquarters: BETHESDA, MD, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  92. Our Lady of Victory Council 16104

    EIN 473546859 · Headquarters: Baltimore, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  93. Our Ladys Center Inc

    EIN 237413452 · Headquarters: Ellicott City, MD, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  94. Our One Nation Under God Inc

    EIN 273363387 · Headquarters: Fallston, MD, US · Unknown & Unclassified · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  95. Our Votes Matter - Maryland Inc

    EIN 472380284 · Headquarters: Silver Spring, MD, US · Unknown & Unclassified · Latest available filing year: 2014 · Primary form: IRS Form 990-N

  96. Oven Inc

    EIN 474959763 · Headquarters: Baltimore, MD, US · Unknown & Unclassified · Latest available filing year: 2017 · Primary form: IRS Form 990-N

  97. Overcomers Church of Christ International

    EIN 383804830 · Headquarters: Laurel, MD, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  98. Overlea Crowd Reunion

    EIN 300674228 · Headquarters: Bel Air, MD, US · Unknown & Unclassified · Latest available filing year: 2018 · Primary form: IRS Form 990-N

  99. Overlea Sewer Consortium

    EIN 833399112 · Headquarters: Rockville, MD, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  100. Overlook Homeowners Association Inc

    EIN 521321313 · Headquarters: Cockeysville, MD, USA · Unknown & Unclassified · Latest available filing year: 2022 · Primary form: IRS Form 990-EZ

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