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- CTC of Illinois (North): General Exchange Catalog
- CTC of Illinois (South): General Exchange Catalog
- CTC of Illinois No. 10 North: General Exchange Tariff
- CTC of Illinois No. 11 South: General Exchange Tariff
- Frontier Communications - Midland, Inc.
- Frontier Communications - Prairie, Inc.
- Frontier Communications - Schuyler, Inc.
- Frontier Communications of Depue, Inc.
- Frontier Communications of Illinois, Inc.
- Frontier Communications of Lakeside, Inc.
- Frontier Communications of Mt. Pulaski, Inc.
- Frontier Communications of Orion, Inc.
- Frontier Communications of the Carolinas Inc. (acquired 06/30/2010)
- Frontier North Inc. (acquired 06/30/2010)
Abingdon, Dallas City, Kampsville, Ramsey, Addieville, Donnellson, Keithsburg, Rio,Albany, Dow, Keyesport, Roseville, Aledo, DuBois, Kilbourne, St. Elmo, Alexis, East Dubuque,Kirkwood,St. Peter, Alpha,Edgewood & Mason, Lanark-Brookville, Sandoval, Altamont, Eliza, Little York, Seaton, Andover, Elvaston, London Mills, Shannon, Ashley-Radom, Erie, Mason City, Shattuc, Bartelso, Farina, Matherville, Sherrard, Basco, Ferris, Medora, Shumway, Batchtown, Fieldon, Milledgeville, Sorento, Bath, Fillmore, Monmouth, Stronghurst, Beecher City, Gillespie, Mount Olive, Sutter, Benld, Greenview, Mulberry Grove, Tamaroa, Biggsville, Gulfport, Nauvoo, Tampico, Bowen,Hamburg, New Boston, Teutopolis, Brownstown, Hamilton,New Douglas,Thomas, Brussels,Hampton-Rapids City,New Minden, Teutopolis, Bunker Hill, Hardin, Niota, Waltonville, Carlinville, Hettick, North Henderson, Warsaw, Carthage, Hillsdale, Oquawka, Watson, Chadwick, Hoffman, Patoka, Woodlawn, Chesterfield-Rockbridge, Hooppole, Pittsburg, Coffeen, Hoyleton, Polo, Coleta, Ina,Port Byron, Cordova, Irvington, Preemption, Jerseyville, Prophetstown, and Joy
The following exchanges are associated with Illinois South:
Fulton, Lyndon and Morrison