| Business | Phone |
| Washington Institute 11221 Angus Pl, Potomac 20854 | (301) 765-9727 |
| Cap Inc 7546 Coddle Harbor Ln, Potomac 20854 | (301) 983-5513 |
| Servon Inc 8505 Victory Ln, Potomac 20854 | (301) 983-1500 |
| Roberta Bren Tutoring Svc 9913 Hall Rd, Potomac 20854 | (301) 299-6920 |
| Educational Consulting Svc 9804 Korman Ct, Potomac 20854 | (301) 299-2537 |
| Eeis Potomac 20854 | (301) 983-2818 |
| Frances Turner Ltd 11137 Hurdle Hill Dr, Potomac 20854 | (301) 299-2012 |