| 1 | $800 million | AARP | Washington | DC |
| 2 | $476 million | American Chemical Society | Washington | DC |
| 3 | $350 million | National Education Association | Washington | DC |
| 4 | $321.9 million | American Diabetes Association | Alexandria | VA |
| 5 | $191 million | American Petroleum Institute | Washington | DC |
| 6 | $178.3 million | National Rifle Association | Fairfax | VA |
| 7 | $114.1 million | Society for Human Resource Management | Alexandria | VA |
| 8 | $111.7 million | American Psychological Association | Washington | DC |
| 9 | $92 million | Association of American Medical Colleges | Washington | DC |
| 10 | $85.5 million | American Association for the Advancement of Science | Washington | DC |
| 11 | $81 million | American Bankers Association | Washington | DC |
| 12 | $78 million | American College of Cardiology | Washington | DC |
| 13 | $72.2 million | Motion Picture Association of America | Washington | DC |
| 14 | $72 million | Consumer Electronics Association | Arlington | VA |
| 15 | $68.8 million | American College of Radiology | Reston | VA |
| 16 | $61 million | National Restaurant Association | Washington | DC |
| 17 | $60 million | American Institute of Architects | Washington | DC |
| 18 | $53.4 million | The American College of Obstetricians and Gynecologists | Washington | DC |
| 19 | $52.2 million | American Society of Civil Engineers | Reston | VA |
| 20 | $50 million | Mortgage Bankers Association | Washington | DC |
| 21 | $49.9 million | CTIA - The Wireless Association | Washington | DC |
| 22 | $48.2 million | Association For Supervision and Curriculum Development | Alexandria | VA |
| 23 | $42.6 million | The American Speech-Language-Hearing Association | Rockville | MD |
| 24 | $41 million | American Society of Health-System Pharmacists | Bethesda | MD |
| 25 | $39 million | ASAE & The Center for Association Leadership | Washington | DC |