| Business | Phone |
| Alter Communications Inc 1040 Park Ave, Baltimore 21201 | (410) 332-1951 |
| Alton Communications Syst Inc 922 W Patapsco Ave, Baltimore 21230 | (410) 354-4400 |
| Anycall Communications Inc 1611 Wicomico St, Baltimore 21230 | (410) 528-9400 |
| Broadwing Communications 601 E Pratt St # 4, Baltimore 21202 | (410) 385-1922 |
| Brooklyn Communicate Ctr 3700 10th St, Baltimore 21225 | (410) 355-0034 |
| Cambrian Communication 100 S Charles St, Baltimore 21201 | (443) 524-1619 |
| Circle Communications Llc 326 N Charles St # 317, Baltimore 21201 | (443) 872-6508 |
| Communications Light Wave 322 S Poppleton St, Baltimore 21230 | (410) 528-9234 |
| Communications Research & Tech 112 N Dallas St, Baltimore 21231 | (410) 732-1930 |
| Doyle Communications 1800 Eastern Ave, Baltimore 21231 | (410) 522-3056 |
| Emerald Communication 3029 Hudson St, Baltimore 21224 | (410) 675-9600 |
| Hci Communications 550 S Bentalou St, Baltimore 21223 | (410) 233-6306 |
| Htn Communications Llc 1101 Russell St, Baltimore 21230 | (410) 347-0304 |
| Idb Communications Llc 333 W Camden St, Baltimore 21201 | (410) 244-8317 |
| Illume Communications 1739 Park Ave # 1, Baltimore 21217 | (410) 783-2627 |
| J R Communications 4432 Park Heights Ave, Baltimore 21215 | (410) 466-9786 |
| Lightyear Communications 111 S Calvert St, Baltimore 21202 | (410) 385-5254 |
| Mjacc 16 S Calvert St # 203, Baltimore 21202 | (410) 637-3232 |
| Nexus Communications Group Inc 200 S President St, Baltimore 21202 | (410) 244-8020 |
| Pulp Communications 3500 Boston St, Baltimore 21224 | (410) 675-2866 |
| Round 2 Communications 2737 Dillon St, Baltimore 21224 | (410) 752-9033 |
| Channel Communications Llc 401 Washington Ave # 205, Baltimore 21204 | (410) 296-0697 |
| Talk About It Communications 5900 Reisterstown Rd # C, Baltimore 21215 | (410) 318-6564 |
| Teleport Communications 600 Light St, Baltimore 21230 | (410) 685-2428 |
| Transplant Communications Inc 3500 Boston St, Baltimore 21224 | (410) 732-4477 |
| Dci Communications Inc 7956 Belair Rd, Baltimore 21236 | (410) 882-5150 |
| Federal Radio Svc Corp 8622 Belair Rd, Baltimore 21236 | (410) 248-2240 |