Adams Telephone Co-Op.
Egyptian Telephone Coop. Assn.
 Hamilton County Telephone Co-op.
McDonough Telephone Coop. 
 Mid Century Telephone Co-op. 
Wabash Telephone Coop., Inc.

 

Flat Rock Telephone Co-Op., Inc.
Oneida Telephone Exchange
 

 

Mailing Address:  P.O. Box 3787, Springfield, IL  62708-3787  
Headquarters Location:  6460 S. 6th St. Frontage Road East, Springfield, IL
Phone:  217.529.5561     Fax:  217.529.5810