| Business | Phone |
| Teleport Communications 234 Church St, New Haven 6510 | (203) 562-2480 |
| Teleport Communications 310 Orange St, New Haven 6510 | (203) 787-1958 |
| Sarco Communications Co 1580 Chapel St, New Haven 6511 | (203) 498-4676 |
| National Broadcast Finance 27 Harrison St, New Haven 6515 | (203) 389-6000 |