| Felton Tel. Co. Inc. | Felton Telephone Company, Inc. | Perham, MN | Active |
| Fenton Coop. Tel. Co. | Fenton Coop Telephone Co. | Fenton, IA | Active |
| Fidelity Tel. Co. | Fidelity Telephone Company | Sullivan, MO | Active |
| Filer Mutual Telephone Company | - | Filer, ID | Active |
| Fishers Island Tel. Corp. | Fishers Island Telephone Corporation | Fishers Island, NY | Active |
| Five Area Tel. Coop. Inc | Five Area Telephone Cooperative, Inc. | Muleshoe, TX | Active |
| Flat Rock Tel. Co-op Inc. | Flat Rock Telephone Co-op., Inc. | Flat Rock, IL | Active |
| Foothills Rural Telephone Coop. Corp., Inc. | - | Staffordsville, KY | Active |
| Foresthill Telephone Co. | Sebastian | Kerman, CA | Active |
| Fort Mill Telephone Company dba Comporium Communic | Comporium Communications | Rock Hill, SC | Active |
| Fort Mojave Telecommunications, Inc | Fort Mojave Telecommunications, Inc. | Mohave Valley, AZ | Active |
| Fort Randall Telephone Company | - | Willmar, MN | Active |
| Franklin Telephone Co., Inc. | Franklin Telephone Company, Inc. | Franklin, VT | Active |
| Franklin Telephone Company, Inc. | - | Bude, MS | Active |
| Fremont Telcom Co. | Fremont Communications | Missoula, MT | Active |
| Frontier California Inc. | - | Norwalk, CT | Active |
| Frontier Communications ILEC Holdings, Inc. | - | Stamford, CT | Inactive |
| Frontier Communications Northwest Inc | - | Norwalk, CT | Active |
| Frontier Communications West Coast Inc. | - | Stamford, CT | Inactive |
| Frontier Communications of Alabama, LLC | - | Norwalk, CT | Inactive |
| Frontier Communications of AuSable Valley, Inc. | - | Norwalk, CT | Active |
| Frontier Communications of Breezewood, LLC | - | Norwalk, CT | Active |
| Frontier Communications of Canton, LLC | - | Norwalk, CT | Active |
| Frontier Communications of DePue, Inc. | - | Norwalk, CT | Active |
| Frontier Communications of Fairmount, LLC | - | Norwalk, CT | Inactive |
| Frontier Communications of Georgia, LLC | - | Norwalk, CT | Active |
| Frontier Communications of Illinois, Inc. | - | Norwalk, CT | Active |
| Frontier Communications of Indiana, Inc. | - | Norwalk, CT | Active |
| Frontier Communications of Iowa, Inc. | - | Norwalk, CT | Active |
| Frontier Communications of Lakeside, Inc. | - | Norwalk, CT | Active |
| Frontier Communications of Lakewood, LLC | - | Norwalk, CT | Active |
| Frontier Communications of Lamar County, LLC | - | Norwalk, CT | Inactive |
| Frontier Communications of Michigan, Inc. | - | Norwalk, CT | Active |
| Frontier Communications of Midland, Inc. | - | Norwalk, CT | Active |
| Frontier Communications of Minnesota, Inc. | - | Norwalk, CT | Active |
| Frontier Communications of Mississippi LLC | - | Norwalk, CT | Active |
| Frontier Communications of Mondovi, LLC | - | Norwalk, CT | Inactive |
| Frontier Communications of Mt. Pulaski, Inc. | - | Norwalk, CT | Active |
| Frontier Communications of New York, Inc. | - | Norwalk, CT | Active |
| Frontier Communications of Orion, Inc. | - | Norwalk, CT | Active |
| Frontier Communications of Oswayo River, LLC | - | Norwalk, CT | Active |
| Frontier Communications of Pennsylvania, LLC | - | Norwalk, CT | Active |
| Frontier Communications of Prairie, Inc. | - | Norwalk, CT | Active |
| Frontier Communications of Schuyler, Inc. | - | Norwalk, CT | Active |
| Frontier Communications of Seneca Gorham, Inc. | - | Norwalk, CT | Active |
| Frontier Communications of St. Croix, LLC | - | Norwalk, CT | Inactive |
| Frontier Communications of Sylvan Lake, Inc. | - | Norwalk, CT | Active |
| Frontier Communications of Thorntown, Inc. | - | Norwalk, CT | Active |
| Frontier Communications of Viroqua, LLC | - | Norwalk, CT | Inactive |
| Frontier Communications of Wisconsin, LLC | - | Norwalk, CT | Active |