← Area code 563
563-856 phone numbers
Numbers 563-856-0000 to 563-856-9999 are assigned to Windstream Iowa Communications, Inc. - North in Colesburg, IA. 3 of its ten thousand-number blocks are assigned to other carriers (number pooling).
Not assigned to any carrier: 563-856-7xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.