| Organization | # of Members |
| Westat | 33 |
| U.S. Bureau of the Census | 17 |
| Arbitron, Inc. | 11 |
| University of Maryland | 11 |
| Mathematica Policy Research, Inc. | 8 |
| RTI International | 8 |
| Schulman, Ronca, & Bucuvalas, Inc. | 7 |
| U.S. Bureau of Labor Statistics | 7 |
| ORC Macro International | 6 |
| Pew Research Center | 6 |
| U.S. Government Accountability Office | 6 |
| American Institutes for Research | 5 |
| George Washington University | 5 |
| AARP | 4 |
| Greenberg Quinlan Rosner Research, Inc. | 4 |
| National Science Foundation | 4 |
| Urban Institute | 4 |
| Belden Russonello & Stewart | 3 |
| KRC Research | 3 |
| National Center for Health Statistics | 3 |
| U.S. Bureau of Transportation Statistics | 3 |
| Abt Associates | 2 |
| Agency for Healthcare Research and Quality | 2 |
| American Chemical Society | 2 |
| Aspen Systems Corporation | 2 |
| Battelle Memorial Institute | 2 |
| CB & Associates | 2 |
| Charlton Research Company | 2 |
| Defense Manpower Data Center | 2 |
| Ernst & Young LLP | 2 |
| Gallup Organization | 2 |
| Lake Snell Perry & Associates | 2 |
| Mathew Greenwald & Associates, Inc. | 2 |
| National Public Radio | 2 |
| Penn, Schoen & Berland Associates | 2 |
| Princeton Survey Research Associates | 2 |
| Society for Human Resource Management | 2 |
| U.S. Department of State | 2 |
| U.S. Office of Management & Budget | 2 |
| Academy for Educational Development | 1 |
| Adirondack Communications | 1 |
| Airports Council International | 1 |
| American Institute of Physics | 1 |
| American Speech-Language-Hearing Association | 1 |
| APCO Insight | 1 |
| Arcola Research Company | 1 |
| Art & Science Group, LLC | 1 |
| Assoc. Schools of Public Health | 1 |
| Associated Press | 1 |
| BVA, Inc | 1 |
| Camp & Associates LLC | 1 |
| Capital One | 1 |
| CareFirst BlueCross BlueShield | 1 |
| Center for the Study of Services | 1 |
| Centers for Disease Control | 1 |
| Child Trends | 1 |
| Children's Defense Fund | 1 |
| Choice Hotels International | 1 |
| Claremont Graduate University | 1 |
| CNN Political Unit | 1 |
| CODA, Inc. | 1 |
| College of William & Mary | 1 |
| Council of Professional Associations on Federal Statistics | 1 |
| D3 Systems, Inc | 1 |
| Democratic Leadership Council | 1 |
| Eastern Research Services, Inc. | 1 |
| Energy Information Administration | 1 |
| Frostburg State University | 1 |
| George Mason University | 1 |
| Global Strategy Group | 1 |
| Goodwill Industries Int'l Inc. | 1 |
| Groeneman Research & Consulting | 1 |
| Hay Group | 1 |
| Howard University | 1 |
| IBM Business Consulting Services | 1 |
| ICT Research Svs. | 1 |
| IMPAQ International, LLC | 1 |
| International City/County Management Association | 1 |
| IQ-Research | 1 |
| JML Communications Group LLC | 1 |
| JPK Research, Inc. | 1 |
| Ketchum Public Relations | 1 |
| Logistics Management Institute | 1 |
| Market Data Analysis, LLC | 1 |
| Market Stategies, Inc. | 1 |
| MayaTech Corporation | 1 |
| MBNA | 1 |
| Mellman Group | 1 |
| Message Science Inc. | 1 |
| MG Strategic Research, Ltd. | 1 |
| Momentum Analysis, LLC | 1 |
| Mystery Pollster.Com | 1 |
| National Education Association | 1 |
| Network Solutions | 1 |
| Newspaper Association of America | 1 |
| Noonan Woods Research, LLC | 1 |
| NORC | 1 |
| NPC, Inc. | 1 |
| Nustats | 1 |
| Office for National Statistics | 1 |
| Office of Planning, Evaluation & Measurement | 1 |
| Organizational Research & Consulting, LLC | 1 |
| Pennsylvania State University | 1 |
| Peter D. Hart Research Associates, Inc. | 1 |
| PTT Systems | 1 |
| Pursuant, Inc. | 1 |
| QSA Research & Strategy | 1 |
| R/S/M Inc. | 1 |
| RAND Corporation | 1 |
| Robert Hitlin Research Associates, Inc. | 1 |
| Roller Marketing Research | 1 |
| Salisbury University | 1 |
| Schaefer Center for Public Policy | 1 |
| Schneiders-Della Volpe-Schulman (SDS) | 1 |
| Smithsonian Institution | 1 |
| SOA Associates | 1 |
| Social Security Administration | 1 |
| Solution Connection | 1 |
| SPSS, Inc. | 1 |
| Synovate, Inc. | 1 |
| U.S. Army Research Institute | 1 |
| U.S. Department of Commerce | 1 |
| U.S. Department of Defense | 1 |
| U.S. Department of the Army | 1 |
| U.S. Department of Transportation | 1 |
| U.S. Food and Drug Administration | 1 |
| U.S. Naval Academy | 1 |
| UC Davis Washington Center | 1 |
| University of Michigan | 1 |
| University of Oregon | 1 |
| University of Virginia | 1 |
| USA Today | 1 |
| Virginia Commonwealth University | 1 |
| Voter/Consumer Research | 1 |
| Washington Post | 1 |
| Wested | 1 |
| Western Wats | 1 |
| Wilson Research Strategies | 1 |
| Winnings Connections Inc. | 1 |
| Yale University | 1 |
| Unspecified Organization | 22 |
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