- NCTA
- NHCAA Institute
- North American Meat Institute
- North American Transplant Coordinator Association
- NYC and Company
- Occasions Caterers
- Office of Homeland Security, The White House
- Office of Intergovernmental Affairs
- Office of the Assistant Secretary for Planning and Evaluation ASPE)
- Omni Hotels
- Omni Shoreham Hotel
- ONCOR International
- Pacific Bridge, Inc.
- Pension Benefit Guaranty Corporation
- People To People International
- Perfect Settings
- Pharmaceutical Research and Manufacturers of America
- Pharmacy Technician Certification Board
- Planned Parenthood
- Prison Fellowship
- Providence Urgent Care Center
- Public Health Foundation
- Quest Diagnostics
- RAFFA
- Rails To Trails Conservancy
- Reinsurance Association of America
- Residence Inn Dupont
- Rockpointe Broadcasting
- Rubber Manufacturers
- Sibley Memorial Hospital
- Sister Cities International
- Smart Brief
- SmithBucklin
- Southern Governors' Association
- Starwood Hotels and Resorts Worldwide, Inc.
- State Work Force
- Stomp Digital Video
- Streampipe
- Suntrust Bank, Greater Washington
- Supreme Court of the United States
- Surety Information Office
- The Center for Association Leadership
- The Christ Child Society
- The Churchill Hotel
- The Communities Group
- The George Washington University Hospital
- The Georgetown
- The Institute for Youth Development
- The Jefferson
- The Links Incorporated