| Company | Now Known As | Last Known Street Address | |
|---|---|---|---|
| O1 Communications of New York, LLC | 5190 Golden Foothill Parkway El Dorado Hills CA 95762 | ||
| Oakstone, Inc.* | America One Communications; Inc. | ||
| Ocampo Tevecom, Inc. | |||
| oCen Communications, Inc. | |||
| Ocius Communications, Inc. | |||
| OCMC, Inc.* | One Call Communications; Inc.; OPTICOM; 1-800-MAX-SAVE; AdvantTel | 801 Congressional Boulevard Carmel Indiana 46032 | |
| OCOM Corporation | |||
| OCOM New York, Inc. | |||
| Office Services of New York, Inc. | Atlantic and Pacific Telecommunications | ||
| Ogden Communications, Inc. | |||
| Ogden Telephone Company | |||
| Olympia Deli* | |||
| Olympia Telcom Group | |||
| Omni Communications, Inc. | |||
| OmniCall, Inc. | |||
| Omniplex Communications Group, LLC | |||
| Omnitron Communications, Inc. | |||
| ONCOR Communications, Inc. | |||
| One-Stop Communications, Inc. | |||
| One-to-One Communications d/b/a One-2-One Communications | |||
| One Call Communications, Inc. d/b/a Opticom | |||
| One Step Billing, Inc. | |||
| One Tel Communications, Inc. | |||
| One Tel Inc. | |||
| OneSource Building Technologhies, Inc. | |||
| OneStar Long Distance, Inc.* | |||
| OnFiber Carrier Services, Inc. | |||
| Online Communications, Inc. | |||
| Online Telecommunications, Inc. | |||
| OnNet Communications LLC ("OnNet") | |||
| Onsite Access LLC.* | |||
| Onsite Access Local LLC* | |||
| OnTheNetAllTheTime | |||
| Onvoy, Inc. d/b/a Onvoy Voice Services | 10300 6th Ave North Plymouth MN 55441 | ||
| ONYX TELCOM, INC. | |||
| Open Access Acquisition LLC | Lightower Fiber Networks | 80 Central Street Boxborough Massachusetts 01719 | |
| Open Network Global Services, L.C. | |||
| OpenTel Communications, Inc. | |||
| Operator Communications, Inc. | Oncor Communications; Inc. (OCI) | ||
| Operator Services Company | Operator Services Company, LLC | 5302 Avenue Q Lubbock TX 79412 | |
| Operator Services Company, LLC | kgb USA 6010 Exchange Parkway NA San Antonio TX 78238 | ||
| Opex Communications, Inc. | TCI Long Distance | 707 Wilshire Blvd. 12th Floor Los Angeles CA 90017 | |
| OPITMUM GLOBAL COMMUNICATIONS, INC | 450 MAIN STREET SPRINGFIELD MA 01105 | ||
| Optex, Inc. | |||
| Optical Telephone Corporation | |||
| Opticom | |||
| Opticom Corporation | |||
| Option One Communications New York, Inc. | |||
| Options Technology Limited | |||
| OPUS Telecom, Inc. | |||
| Oquaga Lake Cable system Inc. | 396 Oquaga lake road Deposit NY 13754 | ||
| Orange Internet Services | |||
| Orca Telecom, Inc. | |||
| Orion Telecommunications Corporation | |||
| Oriskany Falls Telephone Corporation | Vernon Telephone Company, Inc. | TDS Telecom 525 Junction Rd Madison Wi 53717 | |
| Osborne Telecommunications Corporation | |||
| Outside Connection, Inc. | 2ll N. Grove Street Berlin NJ 08009 | ||
| Overlook Communications International Corp. | |||
| Ozark Telecom, Inc. | |||