- American Red Cross of Nassau County
 - Mineola - Association for the Help of Retarded Children
- Brookville - To provide a lifetime of caring, for infants and children to teens, adults and senior citizens, for all people with developmental disabilities.
- Epilepsy Foundation of Long Island
- Garden City - Providing programmes geared to helping individuals in Nassau and Suffolk counties reach their full potential.
- Feingold Association of the United States
- Riverhead - Generates public awareness of the potential role of food and synthetic additives in the treatment of behaviour, learning and health problems.
- Lions Eye Bank
- Manhasset - Providing ocular tissue for transplant, research, and education.
- Lois Joy Galler Foundation
- Melville - Acquires the funds needed to conduct research and develop methods of preventing or curing Hemolytic Uremic Syndrome (HUS).
- Long Island Allergy and Asthma Society
- Includes a listing of certified allergists.
- Lupus Alliance of America - Long Island / Queens
- Bellmore - Provides resources to help those diagnosed with lupus better understand and manage this disease.
- Lymphatic Research Foundation
- Roslyn - Nonprofit corporation whose mission is to help identify, support and promote research on causes, treatments, and potential cures for lymphedema and other angiodysplasia disorders.
- Musella Foundation For Brain Tumor Research & Information
- Hewlett - Brain tumor treatment information and brain tumor virtual trial.
- National Association for Poetry Therapy
- Port Washington
- National MPS Society
- Hicksville - For Mucopolysaccharide disorders. Society history, activities and membership information.
- Support for People With Oral and Head and Neck Cancer
- Locust Valley - National organisation dedicated to meeting the needs or oral and head and neck cancer patients.
- United Cerebral Palsy Association of Greater Suffolk, Inc.
- Hauppauge - Serves the region with health care, social services, and rehabilitative services.
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