Regulated Telephone Companies
| AT&T | |
| Deltacom, Inc. d/b/a Deltacom Long Distance | |
| Easton Telecom Services, Inc. | |
| Fairpoint Communications d/b/a Ellensburg Telephone Company | |
| Fairpoint Communications d/b/a YCOM Networks | |
| Enhanced Telemanagement, Inc., d/b/a Frontier Telemanagement, Inc. | |
| Hood Canal Telephone Company, Inc. | |
| Inland Telephone Company | |
| International Telcom, Ltd. | |
| McLeodUSA Telecommunications Services, Inc. | |
| Netel, Inc. | |
| Norlight Telecommunications, Inc. | |
| Qwest Communications | |
| Rapid Link USA, Inc. | |
| Sprint Spectrum L.P. | |
| T-Netix, Inc. | |
| Toledo Telephone Company, Inc., The | |
| United Communications, Inc. | |
| US South Communictions, Inc. | |
| Verizon Northwest Inc. | |
| (WITA) WA Independent Telephone Assoc. | |
| Working Assets Long Distance | |
Last edit date: 1/21/09