| Business | Phone |
| K 2 Inc 17901 Claggett Landing Rd, Upper Marlboro 20774 | (301) 390-7400 |
| Metro Computer Svc 8023 Penn Randall Pl # B, Upper Marlboro 20772 | (301) 736-2402 |
| Advanced Computer & Cabling 9209 Sherwood Dr, Upper Marlboro 20772 | (301) 599-0056 |
| Total Input Computer Svc 2141 Robert Bowie Dr, Upper Marlboro 20774 | (301) 390-1696 |
| Clark's Computer Consultants 622 Harry S Truman Dr, Upper Marlboro 20774 | (301) 350-3783 |
| Envision Communications Corp 15197 Marlboro Pike, Upper Marlboro 20772 | (301) 574-4114 |
| Ephonics 4117 Bishopmill Dr, Upper Marlboro 20772 | (301) 952-1010 |