← Area code 563
563-339 phone numbers
Numbers 563-339-0000 to 563-339-9999 are assigned to Windstream Iowa Communications, Inc. - Systems in Sumner, IA. 2 of its ten thousand-number blocks are assigned to other carriers (number pooling).
Not assigned to any carrier: 563-339-0xxx, 563-339-1xxx, 563-339-2xxx, 563-339-4xxx, 563-339-6xxx, 563-339-7xxx, 563-339-8xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.