| Business | Phone |
| Information Technology & Comms 6776 Reisterstown Rd # 209, Baltimore 21215 | (410) 585-3100 |
| Public Service Commission 6 Saint Paul St # 1600, Baltimore 21202 | (410) 767-8000 |
| Telecommunications Management 301 W Preston St # 1301, Baltimore 21201 | (410) 767-4650 |
| Communication Repair Facility 5901 Baltimore National Pike, Baltimore 21228 | (410) 747-8590 |