Investor Owned Incumbent Telecommunications Service Providers
- Citizens Telecommunications Company of Minnesota, LLC
- Dakota Central Telecom I, Inc.
- Griggs County Telephone Co. (MLGC, L.L.C.)
- Inter-Community Telephone Company, L.L.C.
- Loretel Systems, Inc. (Arvig)
- Midstate Communications Inc.
- Midstate Telephone Company
- Missouri Valley Communications, Inc. (Nemont)
- North Dakota Telephone Company
- Qwest Corporation (Century Link)
- Turtle Mountain Communications, Inc.
- Wolverton Telephone Company