Reference Data Rate Center Directory DUNCOMBE, IA Rate Center DUNCOMBE — IA Data last updated: March 10, 2026 LATA 632 State IA Area Codes 1 Exchanges (NXX) 1 Carriers 1 Coordinates 42.47008041663953, -93.99394970815948 Area Codes 515 Top Carriers Carrier OCN NXX Count WEBSTER-CALHOUN COOP. TEL. ASSN. 1328 1
