Reference DataRate Center DirectoryBLOCKTON, IA Rate CenterBLOCKTON — IAData last updated: October 30, 2026LATA632StateIAArea Codes1Exchanges (NXX)1Carriers1Coordinates40.61536509646199, -94.47355700367699Area Codes641Top CarriersCarrierOCNNXX CountGRAND RIVER MUTUAL TEL CO18881