Reference Data Rate Center Directory PROMISE CY, IA Rate Center PROMISE CY — IA Data last updated: March 10, 2026 LATA 632 State IA Area Codes 1 Exchanges (NXX) 1 Carriers 1 Coordinates 40.74710811923325, -93.14785235755534 Area Codes 641 Top Carriers Carrier OCN NXX Count WINDSTREAM IOWA COMMUNICATIONS, INC. 1178 1
