| Bloomingdale Home Telephone Co., Inc. | Bloomingdale Home Telephone Company, Inc. | Bloomingdale, IN | Active |
| Bloomingdale Tel. Co. | Bloomingdale Telephone Company, Inc. | Bloomingdale, MI | Active |
| Blossom Telephone Co., Inc | Blossom Telephone Company, Inc. | Blossom, TX | Active |
| Blountsville Telephone LLC | - | Oneonta, AL | Active |
| Blu Telecommunication | BLU Space | MODESTO, CA | Active |
| Blue Earth Valley Tel. Co. | Blue Earth Valley Telephone Company | Blue Earth, MN | Active |
| Blue Ridge Telephone Co. | TDS Telecom | Madison, WI | Active |
| Blue Valley Tele-Communications, Inc. | - | Home, KS | Active |
| Bluestem Telephone Company | - | Mattoon, IL | Active |
| Bluffton Tel. Co. Inc. | Hargray Communications | Hilton Head Island, SC | Active |
| Bonduel Telephone Co. | TDS Telecom | Madison, WI | Active |
| Border to Border Communications, Inc. | Border to Border Communications | Kerrville, TX | Active |
| Brandenburg Telephone Company | Brandenburg Telephone Co., Inc. | Brandenburg, KY | Active |
| Brantley Tel. Co. Inc. | Brantley Telephone Co., Inc. | Nahunta, GA | Active |
| Brazoria Tel. Co. | Brazoria Telephone Company | Brazoria, TX | Active |
| Brazos Telecommunications, Inc. | - | Olney, TX | Inactive |
| Brazos Telephone COOP, Inc. | - | Olney, TX | Active |
| Breda Tel. Corp. | Western Iowa Networks | Breda, IA | Active |
| Bretton Woods Telephone Co., Inc. | - | Bretton Woods, NH | Active |
| Bridge Water Telephone Co. | TDS Telecom | Madison, WI | Active |
| Bridgewater-Canistota Independent Tel. Co. | Bridgewater-Canistota Telephone Co. | Dell Rapids, SD | Inactive |
| Brindlee Mountain Telephone LLC | - | Oneonta, AL | Active |
| Bristol Bay Tel. Coop. Inc. | Bristol Bay Telephone Cooperative, Inc. | King Salmon, AK | Active |
| Brooklyn Mutual Telephone Co. | - | Brooklyn, IA | Active |
| Bruce Telephone Co., Inc. | - | Bruce, WI | Active |
| Bruce Telephone Company, Inc. | - | Bay Springs, MS | Active |
| Buckland Telephone Company | - | Buckland, OH | Active |
| Buggs Island Tel. Coop. | Buggs Island Telephone Cooperative | Bracey, VA | Active |
| Bulloch County Rural Tel. Coop. Inc. | Bulloch Telephone Cooperative | Statesboro, GA | Active |
| Burlington, Brighton, & Wheatland Telephone Co. | TDS Telecom | Madison, WI | Active |
| Burt Tel. Co. | The Burt Telephone Co. | Burt, IA | Inactive |
| Bush-Tell Inc. | Bush-Tell, Inc. | Aniak, AK | Active |
| Butler Telephone Company | TDS Telecom | Madison, WI | Active |
| Butler-Bremer Mutual Tel. Co. | Butler-Bremer Communications | Plainfield, IA | Active |
| C-M-L Tel. Cooperative Assn. | C-M-L Telephone Cooperative Association | Meriden, IA | Active |
| C-R Tel. Co. | C-R Telephone Company | Mattoon, IL | Active |
| CBX Technologies, Inc. | - | Oakland, CA | Inactive |
| CC Communications | - | Fallon, NV | Active |
| Cal-Ore Telephone Co. | - | Dorris, CA | Active |
| Calaveras Telephone Company | - | Copperopolis, CA | Active |
| Calhoun City Telephone Company, Inc. | TDS Telecom | Madison, WI | Active |
| Callaway Telephone Company | - | Perham, MN | Active |
| Cambridge Tel. Co. | Cambridge Telephone Company | Cambridge, NE | Active |
| Cambridge Tel. Co. | Cambridge Telephone Company | Geneseo, IL | Active |
| Cambridge Tel. Co. Inc. | Cambridge Telephone Company, Inc. | Cambridge, ID | Active |
| Camden Tel. & Tele. Co. | TDS Telecom | Madison, WI | Active |
| Camden Telephone Company | TDS Telecom | Madison, WI | Active |
| Cameron Telephone Company, LLC | - | sulphur, LA | Active |
| Campti-Pleasant Hill Telephone Co., Inc. | CP-Tel | Natchitoches, LA | Active |
| Canadian Valley Telephone Co., Inc. | Canadian Valley Telephone Company | Crowder, OK | Active |