Nine Fairfax County companies are on Fortune magazine’s 2011 list of the 500 largest publicly traded companies in the United States. Fortune based its rankings on annual revenue in 2010. Fairfax County has more companies on the prestigious Fortune 500 than do 30 states. Here are the Fairfax County companies on the list:
| RANK | COMPANY | LOCATION |
| 20 | Freddie Mac | Tysons Corner |
| 72 | Northrop Grumman | Falls Church |
| 86 | General Dynamics | Falls Church |
| 134 | Capital One Financial | Tysons Corner |
| 155 | CSC | Falls Church |
| 219 | SAIC | Tysons Corner |
| 406 | NII Holdings | Reston |
| 415 | Gannett Corporation | Tysons Corner |
| 468 | Booz Allen Hamilton | Tysons Corner |