| 1 | Mars Inc. | $21 billion | McLean | VA |
| 2 | Clark Enterprises Inc. | $4.22 billion | Bethesda | MD |
| 3 | Booz Allen Hamilton Inc. | $4 billion | McLean | VA |
| 4 | Discovery Communications | $3.127 billion | Silver Spring | MD |
| 5 | gategroup | $2.1 billion | Reston | VA |
| 6 | B. F. Saul Real Estate Investment Trust | $1.4 billion | Bethesda | MD |
| 7 | PayStaff/ProLease | $1.23 billion | Rockville | MD |
| 8 | Omega World Travel | $1.2 billion | Fairfax | VA |
| 9 | Darcars Automotive Group | $1.1 billion | Silver Spring | MD |
| 10 | Long & Foster Real Estate Inc. | $948 million | Chantilly | VA |
| 11 | Wilmer Cutler Pickering Hale and Dorr LLP | $944 million | Washington | DC |
| 11 | Wilmer Cutler Pickering Hale and Dorr LLP | $944 million | Washington | DC |
| 12 | Hitt Contracting Inc. | $893 million | Fairfax | VA |
| 13 | The Bozzuto Group | $890 million | Greenbelt | MD |
| 14 | Rosenthal Automotive | $884 million | Arlington | VA |
| 15 | Presidio Networked Solutions | $881 million | Greenbelt | MD |
| 16 | Hogan & Hartson LLP | $880 million | Washington | DC |
| 17 | Ourisman Automotive Enterprises | $853 million | Marlow Heights | MD |
| 18 | Kettler | $823 million | McLean | VA |
| 19 | James G. Davis Construction Corp. | $813 million | Rockville | MD |
| 20 | The Donohoe Cos. Inc. | $772 million | Washington | DC |
| 21 | Apptis Inc. | $764 million | Chantilly | VA |
| 22 | Akin Gump Strauss Hauer & Feld LLP | $752 million | Washington | DC |
| 23 | Alion Science and Technology Corp. | $737 million | McLean | VA |
| 24 | Arnold & Porter LLP | $513 million | Washington | DC |
| 25 | Howrey | $475 million | Washington | DC |