Unknown & Unclassified nonprofits in Massachusetts

Unknown & Unclassified nonprofits in Massachusetts. Browse 12,299 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. Shrewsbury School Foundation Inc

    EIN 521814801 · Headquarters: MANCHESTER, MA, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  2. Shrewsbury Street Area Merchants Association Inc

    EIN 800005300 · Headquarters: WORCESTER, MA, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  3. Shrewsbury Youth & Family Services Inc

    EIN 222506543 · Headquarters: SHREWSBURY, MA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  4. Shrine Club of Se Massachusetts

    EIN 046357876 · Headquarters: WILMINGTON, MA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  5. Shriners International

    EIN 581870374 · Headquarters: AGAWAM, MA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  6. Shriners International Melha Shriners

    EIN 041610326 · Headquarters: Chicopee, MA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  7. Si Se Puede Inc

    EIN 222632181 · Headquarters: Lawrence, MA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  8. Siasconset Casino Association

    EIN 042273270 · Headquarters: SIASCONSET, MA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  9. Siasconset Civic Association Inc

    EIN 237393725 · Headquarters: SIASCONSET, MA, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  10. Sibbian Inc

    EIN 813388622 · Headquarters: JAMAICA PLAIN, MA, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  11. Sibley-saltonstall Charitable Foundation

    EIN 223208197 · Headquarters: BOSTON, MA, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-PF

  12. Sierra Leone Cultural Organization Inc

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

  13. Siff Charitable Foundation C/o Grkb

    EIN 046112346 · Headquarters: WORCESTER, MA, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-PF

  14. Sigel Family Foundation Inc

    EIN 464660634 · Headquarters: millbury, MA, US · Unknown & Unclassified · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  15. Sight Loss Services Inc

    EIN 042998072 · Headquarters: SOUTH DENNIS, MA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  16. Sigma Alpha Epsilon Fraternity Ma Beta Alpha Chapter

    EIN 203839708 · Headquarters: Braintree, MA, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  17. Sigma Alpha Epsilon Fraternity Massachusetts Gamma

    EIN 043558254 · Headquarters: Cambridge, MA, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  18. Sigma Alpha Epsilon Fraternity Massachusetts Iota-tau Chapter

    EIN 461039830 · Headquarters: ACTON, MA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  19. Sigma Alpha Epsilon Pi

    EIN 831904873 · Headquarters: WALTHAM, MA, US · Unknown & Unclassified · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  20. Sigma Alpha Mu Fraternity

    EIN 311235014 · Headquarters: Waltham, MA, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  21. Sigma Chi Fraternity

    EIN 042112474 · Headquarters: Boston, MA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  22. Sigma Delta Epsilon Graduate Women in Science Inc

    EIN 363621115 · Headquarters: Everett, MA, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  23. Sigma Delta Tau Society

    EIN 043071585 · Headquarters: BOSTON, MA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  24. Sigma Delta Tau Society Psi Tau Chapter

    EIN 042428297 · Headquarters: AMHERST, MA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  25. Sigma Delta Tau Society Psi Tau Corporation

    EIN 237193065 · Headquarters: AMHERST, MA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  26. Sigma Gamma Epsilon Zeta Iota Chp

    EIN 043153243 · Headquarters: Bridgewater, MA, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  27. Sigma Gamma Rho Sorority

    EIN 271356216 · Headquarters: SPRINGFIELD, MA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  28. Sigma Gamma Rho Sorority Inc

    EIN 043004015 · Headquarters: ROXBURY, MA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  29. Sigma Gamma Rho Sorority Inc

    EIN 474135374 · Headquarters: BOSTON, MA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  30. Sigma Gamma Rho Sorority Inc

    EIN 900650727 · Headquarters: Quincy, MA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  31. Sigma Kappa Sorority Beta Eta Chapter

    EIN 042108452 · Headquarters: HADLEY, MA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  32. Sigma Natick Chapter

    EIN 043476621 · Headquarters: Natick, MA, US · Unknown & Unclassified · Latest available filing year: 2019 · Primary form: IRS Form 990-N

  33. Sigma Phi Alpha Dental Hygiene Honor Society

    EIN 043294423 · Headquarters: SOMERSET, MA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  34. Sigma Phi Alpha Dental Hygiene Honor Society

    EIN 046151923 · Headquarters: Boston, MA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  35. Sigma Phi Alpha Dental Hygiene Honor Society

    EIN 911895416 · Headquarters: Worcester, MA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  36. Sigma Phi Epsilon Fraternity Inc Massachusetts Delta Chapter

    EIN 042123081 · Headquarters: BOSTON, MA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  37. Sigma Phi Epsilon Massachusetts Zeta Tufts University Alumni and V

    EIN 465619105 · Headquarters: Boston, MA, US · Unknown & Unclassified · Latest available filing year: 2013 · Primary form: IRS Form 990-N

  38. Sigma Phi Gamma International Sorority

    EIN 046145994 · Headquarters: Plainville, MA, US · Unknown & Unclassified · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  39. Sigma Phi Gamma International Sorority Inc

    EIN 042582260 · Headquarters: Mansfield, MA, US · Unknown & Unclassified · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  40. Sigma Phi Gamma International Sorority Inc

    EIN 043221041 · Headquarters: Marblehead, MA, US · Unknown & Unclassified · Latest available filing year: 2012 · Primary form: IRS Form 990-N

  41. Sigma Phi Gamma International Sorority Inc

    EIN 046111808 · Headquarters: Rehobeth, MA, US · Unknown & Unclassified · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  42. Sigma Phi Gamma International Sorority Inc

    EIN 237168326 · Headquarters: Wrentham, MA, US · Unknown & Unclassified · Latest available filing year: 2009 · Primary form: IRS Form 990-N

  43. Sigma Pi Fraternity International Gamma-iota Chapter

    EIN 042393466 · Headquarters: WORCESTER, MA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  44. Sigma Sigma Sigma Inc

    EIN 453804043 · Headquarters: Worcester, MA, US · Unknown & Unclassified · Latest available filing year: 2022 · Primary form: IRS Form 990-N

  45. Sigma Sigma Sigma Inc

    EIN 832062532 · Headquarters: Boston, MA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  46. Sigma Tau Gamma Delta Phi Alumni Association Incorporated

    EIN 462699182 · Headquarters: Buzzards Bay, MA, US · Unknown & Unclassified · Latest available filing year: 2016 · Primary form: IRS Form 990-N

  47. Sigma Theta Tau Inc

    EIN 042609600 · Headquarters: Boston, MA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  48. Sigma Theta Tau Inc

    EIN 237111294 · Headquarters: Chestnut Hill, MA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  49. Sigma Theta Tau Inc

    EIN 311242956 · Headquarters: Auburn, MA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  50. Sigma Theta Tau Inc

    EIN 363314845 · Headquarters: Salem, MA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  51. Sigma Theta Tau Inc

    EIN 363314851 · Headquarters: Lowell, MA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  52. Sigma Theta Tau Inc

    EIN 363479066 · Headquarters: Dartmouth, MA, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  53. Sigma Theta Tau International Inc

    EIN 046112795 · Headquarters: Milton, MA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  54. Sigma Theta Tau International Inc

    EIN 237243783 · Headquarters: Amherst, MA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  55. Sigma Theta Tau International Inc

    EIN 900012742 · Headquarters: Framingham, MA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  56. Sigma Theta Tau International Inc

    EIN 901029450 · Headquarters: Beverly, MA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  57. Sigma Theta Tau International Inc

    EIN 911935299 · Headquarters: Weston, MA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  58. Signature Healthcare Corporation

    EIN 042103554 · Headquarters: Brockton, MA, USA · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990

  59. Silver Lake Boys Hockey Boosters

    EIN 392306529 · Headquarters: Kingston, MA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  60. Silver Meadow Inc

    EIN 223418980 · Headquarters: SPRINGFIELD, MA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  61. Silver Spring Beach Association Inc

    EIN 043108281 · Headquarters: North Eastham, MA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  62. Simon B Gottlieb Charitable Foundation

    EIN 856164064 · Headquarters: ALLSTON, MA, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-PF

  63. Simon of Cyrene Society Inc Co Weston Associates Inc

    EIN 042784791 · Headquarters: BOSTON, MA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  64. Simon W Robinson Lodge Af & Am

    EIN 237170377 · Headquarters: LEXINGTON, MA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  65. Sinai Temple Endowment Trust

    EIN 042655369 · Headquarters: SPRINGFIELD, MA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  66. Singletary Rod & Gun Club Inc

    EIN 046068356 · Headquarters: Oxford, MA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  67. Sioga Club of Berkshire County Inc George B Crane Memorial Center

    EIN 042620389 · Headquarters: PITTSFIELD, MA, USA · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990

  68. Sippican Choral Society

    EIN 222530352 · Headquarters: Marion, MA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  69. Sippican Historical Society

    EIN 046125635 · Headquarters: Marion, MA, USA · Unknown & Unclassified · Latest available filing year: 2022 · Primary form: IRS Form 990

  70. Sippican Rod and Gun Club Inc

    EIN 042493724 · Headquarters: ROCHESTER, MA, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  71. Sippican Tennis Club

    EIN 042189006 · Headquarters: Marion, MA, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  72. Sirius Inc

    EIN 042652930 · Headquarters: SHUTESBURY, MA, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  73. Sisters of Providence Health System Inc

    EIN 043398374 · Headquarters: HOLYOKE, MA, USA · Unknown & Unclassified · Latest available filing year: 2016 · Primary form: IRS Form 990

  74. Sisucare

    EIN 264339915 · Headquarters: Hubbardston, MA, US · Unknown & Unclassified · Latest available filing year: 2012 · Primary form: IRS Form 990-N

  75. Sixth Association Properties Inc

    EIN 043223566 · Headquarters: CHICOPEE, MA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  76. Siyanda Inc

    EIN 932097104 · Headquarters: Boston, MA, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  77. Skating Club of Amherst Inc

    EIN 510189842 · Headquarters: HADLEY, MA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-EZ

  78. Ski Ward Community Race Team

    EIN 043435340 · Headquarters: Northborough, MA, US · Unknown & Unclassified · Latest available filing year: 2013 · Primary form: IRS Form 990-N

  79. Skin Talk

    EIN 464690327 · Headquarters: Wilbraham, MA, US · Unknown & Unclassified · Latest available filing year: 2014 · Primary form: IRS Form 990-N

  80. Skoden Foundation

    EIN 832939204 · Headquarters: BOSTON, MA, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-PF

  81. Slovak Catholic Sokol

    EIN 237523053 · Headquarters: Douglas, MA, US · Unknown & Unclassified · Latest available filing year: 2020 · Primary form: IRS Form 990-N

  82. Slovak Catholic Sokol 28

    EIN 237522695 · Headquarters: Douglas, MA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  83. Slovak Citizens Club Inc

    EIN 237417720 · Headquarters: WESTFIELD, MA, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-EZ

  84. Slovak Gymnastic Union Sokol of the USA 244

    EIN 237265786 · Headquarters: Westfield, MA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  85. Small Property Owners Association Inc

    EIN 043118975 · Headquarters: Cambridge, MA, USA · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-EZ

  86. Smarter Sports Association Inc

    EIN 462923980 · Headquarters: Waltham, MA, US · Unknown & Unclassified · Latest available filing year: 2015 · Primary form: IRS Form 990-N

  87. Smile Like Jack Memorial Fund Inc

    EIN 881138061 · Headquarters: WESTFIELD, MA, USA · Unknown & Unclassified · Latest available filing year: 2021 · Primary form: IRS Form 990-EZ

  88. Smith Academy Trustees

    EIN 042785440 · Headquarters: HATFIELD, MA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  89. Smith College Club of the Treasure Coast Inc

    EIN 650306642 · Headquarters: Lincoln, MA, US · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-N

  90. Smith Students' Aid Society Inc

    EIN 046052751 · Headquarters: Northampton, MA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  91. Smocking Arts Guild of America Inc

    EIN 581518462 · Headquarters: Essex, MA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  92. Smocking Arts Guild of America Inc

    EIN 830490338 · Headquarters: West Roxbury, MA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  93. Snapdragon Montessori School

    EIN 812350019 · Headquarters: Cambridge, MA, United States · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

  94. Snave Foundation

    EIN 236928009 · Headquarters: Winchester, MA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990-PF

  95. Snowbirds Snowmobile Club Inc

    EIN 222559972 · Headquarters: SPENCER, MA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  96. Snowbound Club Inc

    EIN 042677163 · Headquarters: TEMPLETON, MA, USA · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-EZ

  97. Snowman Movement Inc

    EIN 843927620 · Headquarters: Dartmouth, MA, US · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990-N

  98. Snowmobile Association of Ma

    EIN 222497133 · Headquarters: GREENFIELD, MA, USA · Unknown & Unclassified · Latest available filing year: 2025 · Primary form: IRS Form 990

  99. Snowmobilers United Incorporated

    EIN 043153238 · Headquarters: SHREWSBURY, MA, US · Unknown & Unclassified · Latest available filing year: 2023 · Primary form: IRS Form 990-N

  100. Soc for Human Advncmt Through Rehab Engr Fndtn Inc

    EIN 222506229 · Headquarters: New Bedford, MA, USA · Unknown & Unclassified · Latest available filing year: 2024 · Primary form: IRS Form 990

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