Eight Fairfax County companies are on Fortune magazine’s 2010 list of the 500 largest publicly traded companies in the United States. Fortune based its rankings on annual revenue in 2009. Fairfax County has more companies on the prestigious Fortune 500 than do 31 states. Here are the Fairfax County companies on the list:
| RANK | COMPANY | LOCATION |
| 54 | Freddie Mac | McLean |
| 69 | General Dynamics | Falls Church |
| 138 | CSC | Falls Church |
| 144 | Capital One Financial | McLean |
| 215 | SAIC | McLean |
| 354 | Sallie Mae (SLM) | Reston |
| 370 | Gannett Corporation | McLean |
| 468 |
NII Holdings |
Reston |