Nonprofits in Maryland

Nonprofits in Maryland. Browse 47,413 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. Open Source Phonics Inc

    EIN 881062701 · Headquarters: Bethesda, MD, US · Education · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  2. Open Space Arts Organization Inc

    EIN 521639254 · Headquarters: Reisterstown, MD, USA · Arts, Culture & Humanities · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  3. Open Stemware Foundation

    EIN 871051630 · Headquarters: Woodbine, MD, US · Education · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  4. Open Veil Society

    EIN 800205907 · Headquarters: COLUMBIA, MD, US · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  5. Open Vision Ministry

    EIN 204134173 · Headquarters: OWINGS MILLS, MD, US · Religion Related · Latest available filing year: 2014 · Primary form: IRS Form 990-N

  6. Open Works Inc

    EIN 475535634 · Headquarters: BALTIMORE, MD, USA · Arts, Culture & Humanities · Latest available filing year: 2024 · Primary form: IRS Form 990

  7. Openaugment Consortium Inc

    EIN 743082571 · Headquarters: Ontario Canada, MD, US · Science & Technology · Latest available filing year: 2013 · Primary form: IRS Form 990-N

  8. Opendoor Housing Fund

    EIN 300155183 · Headquarters: POTOMAC, MD, USA · Housing & Shelter · Latest available filing year: 2020 · Primary form: IRS Form 990

  9. OpenDor Foundation

    EIN 262711794 · Headquarters: Chevy Chase, MD, US · Religion Related · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  10. Opened Hands

    EIN 870949504 · Headquarters: Oakland, MD, US · Public & Societal Benefit · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  11. Opengiving Foundation Inc

    EIN 993372252 · Headquarters: bowie, MD, US · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  12. Opening New Doors Foundation Inc

    EIN 814690622 · Headquarters: Damascus, MD, US · Human Services · Latest available filing year: 2019 · Primary form: IRS Form 990-N

  13. Opening Night Productions

    EIN 992378357 · Headquarters: Prince Frederick, MD, US · Arts, Culture & Humanities · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  14. Opening Worlds Foundation Inc

    EIN 331708731 · Headquarters: BRANDYWINE, MD, US · Youth Development · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  15. Opensecuritytraining Inc

    EIN 861180701 · Headquarters: Colesville, MD, USA · Education · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  16. Opera at Riderwood

    EIN 884357274 · Headquarters: Silver Spring, MD, US · Arts, Culture & Humanities · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  17. Opera Comique De Washington

    EIN 932783402 · Headquarters: Bethesda, MD, US · Arts, Culture & Humanities · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  18. Opera Vivente

    EIN 522175213 · Headquarters: Essex, MD, US · Arts, Culture & Humanities · Latest available filing year: 2014 · Primary form: IRS Form 990-N

  19. 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

  20. 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

  21. 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

  22. Operating Engineers Local No 37 Vacation Fund

    EIN 526070524 · Headquarters: BALTIMORE, MD, USA · Employment · Latest available filing year: 2013 · Primary form: IRS Form 990

  23. 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

  24. Operation - Safe Escape

    EIN 464234802 · Headquarters: Glen Burnie, MD, US · Public Safety, Disaster Preparedness & Relief · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  25. Operation Arts Foundation Inc

    EIN 850768394 · Headquarters: Laurel, MD, US · Arts, Culture & Humanities · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  26. Operation Backbone Inc

    EIN 455562642 · Headquarters: Centerville, MD, US · Health Care · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  27. Operation Canasta Inc

    EIN 814411001 · Headquarters: Kensington, MD, US · Arts, Culture & Humanities · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  28. Operation Care

    EIN 834141747 · Headquarters: Owings Mills, MD, US · Religion Related · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  29. Operation Champs

    EIN 460698632 · Headquarters: Bethesda, MD, US · Human Services · Latest available filing year: 2015 · Primary form: IRS Form 990-N

  30. Operation Earnie's Plate Incorporated

    EIN 821476717 · Headquarters: Upper Marlboro, MD, USA · Health Care · Latest available filing year: 2025 · Primary form: IRS Form 990

  31. Operation Embrace Foundation Inc

    EIN 043652179 · Headquarters: POTOMAC, MD, USA · Human Services · Latest available filing year: 2025 · Primary form: IRS Form 990

  32. Operation Enduring Respect Inc

    EIN 452869625 · Headquarters: west river, MD, USA · Human Services · Latest available filing year: 2013 · Primary form: IRS Form 990-EZ

  33. Operation Experience Inc

    EIN 821589305 · Headquarters: Salisbury, MD, US · Human Services · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  34. Operation Home Again Inc

    EIN 881593985 · Headquarters: BALTIMORE, MD, US · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  35. Operation Illumination Incorporated

    EIN 473479224 · Headquarters: GLEN BURNIE, MD, US · Human Services · Latest available filing year: 2014 · Primary form: IRS Form 990-N

  36. Operation Incubation Inc

    EIN 364705500 · Headquarters: Catonsville, MD, US · International, Foreign Affairs & National Security · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  37. Operation Jumpstart Legacy Outreach Ministries and Services Inc

    EIN 871759823 · Headquarters: Temple Hills, MD, US · Mental Health & Crisis Intervention · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  38. Operation Life Ministries Ltd

    EIN 521755218 · Headquarters: BALTIMORE, MD, US · Religion Related · Latest available filing year: 2011 · Primary form: IRS Form 990-N

  39. Operation Lifeblood

    EIN 394558916 · Headquarters: Davidsonville, MD, US · Medical Research · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  40. Operation Listen Inc

    EIN 821652984 · Headquarters: Randallstown, MD, USA · Civil Rights, Social Action & Advocacy · Latest available filing year: 2019 · Primary form: IRS Form 990-PF

  41. Operation Lourdes Helping Heroes Heal Inc

    EIN 450992498 · Headquarters: ELKRIDGE, MD, USA · Human Services · Latest available filing year: 2013 · Primary form: IRS Form 990-EZ

  42. Operation Love Thy Neighbor

    EIN 853824509 · Headquarters: WHITEFORD, MD, USA · Human Services · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  43. Operation Mother S Love Inc

    EIN 394928887 · Headquarters: Gaithersburg, MD, US · Public & Societal Benefit · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  44. Operation Motorsport Program Foundation

    EIN 842463791 · Headquarters: Mt Airy, MD, USA · Human Services · Latest available filing year: 2025 · Primary form: IRS Form 990

  45. Operation No Persons Left Behind Outdoors

    EIN 811602191 · Headquarters: LIBERTYTOWN, MD, USA · Human Services · Latest available filing year: 2025 · Primary form: IRS Form 990

  46. Operation Open Arms Inc

    EIN 331205084 · Headquarters: EASTON, MD, USA · Human Services · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  47. Operation Organize

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

  48. Operation Pulse Inc

    EIN 521821051 · Headquarters: HAMPSTEAD, MD, USA · Health Care · Latest available filing year: 2024 · Primary form: IRS Form 990

  49. Operation Raise the Roof Inc

    EIN 872951129 · Headquarters: Lanham, MD, US · Housing & Shelter · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  50. Operation Reach Back

    EIN 463432525 · Headquarters: Bowie, MD, US · Youth Development · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  51. Operation Reachback Inc the Association of Black Seventh-day

    EIN 521878291 · Headquarters: Aberdeen, MD, US · Education · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  52. Operation Respond Institute Inc

    EIN 521921390 · Headquarters: Fulton, MD, US · Public Safety, Disaster Preparedness & Relief · Latest available filing year: 2017 · Primary form: IRS Form 990-N

  53. Operation Restore Decency

    EIN 851797038 · Headquarters: CHEVY CHASE, MD, US · Health Care · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  54. Operation Safe Shelter Inc

    EIN 464594077 · Headquarters: La Plata, MD, US · Human Services · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  55. Operation Save a Child

    EIN 453615430 · Headquarters: Mount Airy, MD, US · International, Foreign Affairs & National Security · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  56. Operation Second Chance Inc

    EIN 202624345 · Headquarters: Germantown, MD, USA · Public & Societal Benefit · Latest available filing year: 2025 · Primary form: IRS Form 990

  57. Operation Spread Love Inc

    EIN 931480983 · Headquarters: Largo, MD, US · Religion Related · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  58. Operation Tight Lines Inc

    EIN 825005039 · Headquarters: TOWSON, MD, USA · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2025 · Primary form: IRS Form 990-PF

  59. Operation Walk Maryland

    EIN 261336665 · Headquarters: BROOKLANDVILLE, MD, USA · Health Care · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  60. Operation Warm Heart

    EIN 932825644 · Headquarters: Glen Burnie, MD, US · Human Services · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  61. Operation Warrior Refuge

    EIN 463538724 · Headquarters: Leonardtown, MD, US · Health Care · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  62. Operation We Care Inc

    EIN 453847035 · Headquarters: SALISBURY, MD, USA · Public & Societal Benefit · Latest available filing year: 2024 · Primary form: IRS Form 990

  63. Operation Win in Life Cdc Inc

    EIN 810794203 · Headquarters: Baltimore, MD, US · Community Improvement & Capacity Building · Latest available filing year: 2019 · Primary form: IRS Form 990-N

  64. Operative Plasterers' & Cement Masons' International Association

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

  65. Oppenheim Foundation

    EIN 236296919 · Headquarters: KENSINGTON, MD, USA · Philanthropy, Voluntarism & Grantmaking Foundations · Latest available filing year: 2022 · Primary form: IRS Form 990-PF

  66. Opportunist Llc

    EIN 850729305 · Headquarters: WALDORF, MD, US · Education · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  67. Opportunities for the Blind Inc

    EIN 521268977 · Headquarters: FUNKSTOWN, MD, US · Diseases, Disorders & Medical Disciplines · Latest available filing year: 2007 · Primary form: IRS Form 990-N

  68. Opportunities Inc

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

  69. Opportunities Unlimited Inc

    EIN 384320206 · Headquarters: PIKESVILLE, MD, US · Human Services · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  70. 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

  71. Opportunity Builders Inc.

    EIN 520743369 · Headquarters: MILLERSVILLE, MD, US · Employment · Latest available filing year: 2024 · Primary form: IRS Form 990

  72. Opportunity Maryland

    EIN 883116524 · Headquarters: ROCKVILLE, MD, US · Education · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  73. Opportunity Ministries Inc

    EIN 454599833 · Headquarters: PASADENA, MD, USA · Environment · Latest available filing year: 2024 · Primary form: IRS Form 990

  74. Opportunity Through Education

    EIN 842120867 · Headquarters: Darnestown, MD, US · Youth Development · Latest available filing year: 2021 · Primary form: IRS Form 990-N

  75. Opsa Dc Metro Inc

    EIN 800215084 · Headquarters: Bowie, MD, US · Education · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  76. Optimal Cancer Care Alliance

    EIN 820774117 · Headquarters: Baltimore, MD, US · Medical Research · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  77. Optimal Learning Schoool Pto

    EIN 475350581 · Headquarters: GERMANTOWN, MD, US · Education · Latest available filing year: 2018 · Primary form: IRS Form 990-N

  78. Optimal Wellness Research Foundation Inc

    EIN 461224385 · Headquarters: COLUMBIA, MD, USA · Health Care · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  79. Optimist Club of Cockeysville Inc

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

  80. 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

  81. Optimist Club of Loch Raven Maryland Foundation Inc

    EIN 521973885 · Headquarters: TOWSON, MD, USA · Community Improvement & Capacity Building · Latest available filing year: 2023 · Primary form: IRS Form 990-PF

  82. Optimist Foundation of Chestertown

    EIN 470894156 · Headquarters: Chestertown, MD, US · Youth Development · Latest available filing year: 2017 · Primary form: IRS Form 990-N

  83. Optimist International

    EIN 212706205 · Headquarters: Severna Park, MD, US · Youth Development · Latest available filing year: 2015 · Primary form: IRS Form 990-N

  84. Optimist International

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

  85. Optimist International

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

  86. Optimist International

    EIN 237180881 · Headquarters: westminster, MD, US · Youth Development · Latest available filing year: 2008 · Primary form: IRS Form 990-N

  87. Optimist International

    EIN 237281165 · Headquarters: Baltimore, MD, US · Youth Development · Latest available filing year: 2013 · Primary form: IRS Form 990-N

  88. Optimist International

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

  89. Optimist International

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

  90. Optimist International

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

  91. Optimist International

    EIN 520912125 · Headquarters: Chestertown, MD, US · Youth Development · Latest available filing year: 2017 · Primary form: IRS Form 990-N

  92. Optimist International

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

  93. Optimist International

    EIN 521341719 · Headquarters: Leonardtown, MD, US · Youth Development · Latest available filing year: 2007 · Primary form: IRS Form 990-N

  94. Optimist International

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

  95. Optimist International

    EIN 521432839 · Headquarters: Chaptico, MD, US · Youth Development · Latest available filing year: 2018 · Primary form: IRS Form 990-N

  96. Optimist International

    EIN 521489121 · Headquarters: Saint Leonard, MD, US · Youth Development · Latest available filing year: 2010 · Primary form: IRS Form 990-N

  97. Optimist International

    EIN 521771755 · Headquarters: Hollywood, MD, US · Youth Development · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  98. Optimist International

    EIN 522108212 · Headquarters: Severna Park, MD, US · Youth Development · Latest available filing year: 2007 · Primary form: IRS Form 990-N

  99. Optimist International

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

  100. Optimist International

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

First page and all pages