Reference Data Rate Center Directory CALAMUS, IA Rate Center CALAMUS — IA Data last updated: March 10, 2026 LATA 634 State IA Area Codes 1 Exchanges (NXX) 1 Carriers 1 Coordinates 41.826614309322, -90.75942010314799 Area Codes 563 Top Carriers Carrier OCN NXX Count F&B COMMUNICATIONS, INC. 1160 1
