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319 E Iowa: Cedar Rapids 55 T1 line providers 515 Cent. Iowa: Des Moines 56 T1 line providers 563 E Iowa: Davenport, Dubuque 34 T1 line providers | 641 Iowa: Mason City, Marshalltown, Creston, Ottumwa 36 T1 line providers 712 W Iowa: Council Bluffs 49 T1 line providers |