| AEG Mobile Communication GmbH |
| Alcatel |
| American Association of Museums |
| American Communications Group |
| American Concrete Pressure Pipe Association |
| American Corporate Counsel Association |
| American Correctional Association |
| The American Institute for Conservation of Historic & Artistic Works |
| American Occupational Therapy Association |
| American Orthotic and Prosthetic Association |
| American Physical Therapy Association |
| American Rehab Association |
| American School Food Service Association |
| American Society of Association Executives |
| American Society of Internal Medicine |
| American Society of Landscape Architects |
| American Society for Public Administration |
| Apartment & Office Building Association |
| Association of Clinical Research Professionals |
| Association of Fundraising Professionals/DC |
| Association of Fundraising Professionals/Chicago |
| Association of Independent Schools of Greater Washington |
| Association of School Business Officials International |
| Association of Youth Museums |
| British Telecom |
| BUILD-PAC |
| Children's National Medical Center |
| Crisis Magazine/The Morley Institute |
| D.C. Arc |
| D.C. Building Industry Association |
| Direct Marketing Association of Baltimore |
| Direct Marketing Association of Washington |
| Energy Efficient Building Association |
| Expo Experts |
| Fastener Industry News |
| Flagship Properties Management |
| Florida Furniture Dealers Association |
| Foundation for Public Affairs |
| France Telecom |
| Georgetown Center of Business Education and Research |
| Greater Washington Society of Association Executives |
| Home Builders Institute |
| Instrument Society of America |
| International Bridge, Tunnel, & Turnpike Association |
| International Coach Federation |
| International Communications Industries Association |
| Joint Pipe Promotion Group |
| LCC International |
| NAGASA |
| NAHB Executive Officers Council |
| National Affordable Housing Management Association |
| National Air Filtration Association |
| National Association of College and University Business Officers |
| National Association of Home Builders |
| National Assn. of Plumbing-Heating-Cooling Contractors Educational Foundation |
| National Association of Social Workers |
| National Business Officers Association |
| National Center for Nonprofit Boards |
| National Concrete Masonry Association |
| National Hospital Health System Foundation |
| National Institute of Governmental Purchasers |
| National Museum of Women in the Arts |
| National RV Dealers Association |
| National School Transportation Association |
| National Society of Fund Raising Executives |
| National Systems Contractors Association |
| Our Lady of Mercy Community Outreach |
| Painting and Decorating Contractors of America |
| Parks and History Association |
| Property Management Association |
| Public Affairs Council |
| Red Baron School Food Service |
| RRH Associates |
| School Food Service Foundation |
| Service Technicians Society |
| SMART HOUSE, L.P. |
| Smith Realty Companies |
| Society of American Florists |
| Society of American Foresters |
| Society of Plastics Engineers |
| Solid Waste Association of North America |
| Southeastern Assisted Housing Management Association |
| Southern Home Furnishings Association |
| Southern Management Company |
| Special Libraries Association |
| TEG International |
| United Homeowners Association |
| Virginia Apartment & Management Association |
| Washington Council of Engineering Laboratories |
| Weber and Associates |