Reference Data Rate Center Directory HARTWICK, IA Rate Center HARTWICK — IA Data last updated: March 10, 2026 LATA 635 State IA Area Codes 1 Exchanges (NXX) 1 Carriers 1 Coordinates 41.78550481868447, -92.34411347504297 Area Codes 319 Top Carriers Carrier OCN NXX Count COOPERATIVE TEL. CO. 1139 1
