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423 E Tennessee, except Knoxville metro area: Chattanooga, Bristol, Johnson City, Kingsport, Greeneville 56 T1 line providers 615 Northern Middle Tennessee: Nashville metro area 56 T1 line providers 731 W Tennessee: outside Memphis metro area 37 T1 line providers | 865 E Tennessee: Knoxville, Knox and adjacent counties 44 T1 line providers 901 W Tennessee: Memphis metro area 56 T1 line providers 931 Middle Tennessee: semi-circular ring around Nashville 49 T1 line providers |