A-F
- Association for the Advancement of Blood & Biotherapies
- Alexander Graham Bell Association for the Deaf and Hard of Hearing
- Alexandria Braces
- American Association for Anatomy
- American Association for Dental, Oral, and Craniofacial Research
- American Association for Geriatric Psychiatry
- American Forests
- American Prime
- Americans for the Arts
- American Medical Informatics Association
- American Nurses Association
- American Society of Cataract and Refractive Surgery
- American Society for Cell Biology
- American Society for Clinical Pharmacology and Therapeutics
- American Society for Nutrition
- American Society of Ophthalmic Administrators
- American Society for Parenteral and Enteral Nutrition
- American Society of Association Executives
- American String Teachers Association
- Asian Americans Advancing Justice-AAJC
- Association of Community Cancer Centers
- Association of Water Technologies
- Casualty Actuarial Society
- Center for the Study of Social Policy
- Communities in Schools
- Council for Exceptional Children
- Council of Independent Colleges
- Council of Korean Americans
- DC Special Education Cooperative
- District of Columbia Rehabilitation Services Administration
- Endocrine Society
- Energy Storage Association
- Entomological Society of America
- Eye Bank Association of America
- Federation of American Societies for Experimental Biology
- Futures Industry Association
I-Z
- International Association for Dental Research
- International Association for the Study of Pain
- International Society for Pharmaceutical Engineering
- Jordan Design Build Group
- Koniag Government Services
- Legal Aid Society of the District of Columbia
- Locus Geographics
- Managing to Be Wealthy
- National Active and Retired Federal Employees Association
- National Association of Boards of Pharmacy
- National Association of Social Workers
- National Park Conservation Association
- National Parking Association
- National Retail Federation
- New York City Department of Consumer Affairs – Office of Financial Empowerment
- Oak Hill Psychological Services
- Online News Association
- Oxford Finance
- Personal Care Products Council
- Potomac Health Foundation
- Power to Decide
- Public Knowledge
- Ronald McDonald House Charities
- RTI International
- School Nutrition Association
- Society for Simulation in Healthcare
- TESOL International Association
- The Greater Washington Society of CPAs
- The Newton School
- United Service Organizations
- United States Navy Memorial
- Virginia Society of Certified Public Accountants
- World Bank, The Compliance Advisor Ombudsman
- 340B Health