Largest by revenue
| Organization | City | Revenue |
|---|
| AARP | Washington | $10,969,160,920 |
| American National Red Cross | Washington | $3,916,983,933 |
| Gavi Alliance | Washington | $2,547,417,284 |
| Georgetown University | Washington | $2,296,035,338 |
| National Association of Letter Carriers | Washington | $2,203,167,533 |
| Smithsonian Institute | Washington | $1,911,142,906 |
| Childrens Hospital | Washington | $1,872,813,787 |
| Howard University | Washington | $1,433,002,000 |
| American University | Washington | $929,602,491 |
| Fiat Lux Risk and Insurance Company | Washington | $842,304,486 |
| American Foreign Service Protective Association | Washington | $827,100,176 |
| American Chemical Society | Washington | $819,099,460 |
| Paypal Charitable Giving Fund | Washington | $813,412,937 |
| New Venture Fund | Washington | $662,364,100 |
| National Fish and Wildlife Foundation | Washington | $584,225,222 |
| Legal Services Corporation | Washington | $572,829,932 |
| United Mine Workers of America 1993 Benefit Plan and Trust | Washington | $541,575,011 |
| Pharmaceutical Research and Manufacturers of America | Washington | $521,348,217 |
| John F Kennedy Center for the Performing Arts | Washington | $516,578,163 |
| Association of Universities for | Washington | $468,809,827 |
See all 293 ranked by revenue →