Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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Castroville, TX

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NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
830-538 7 SNANTXCA60Z  508J CENTURYLINK COMMUNICATIONS, LLC 566   2016-11-23   
830-538 8 SNANTX78G00  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 566   2012-07-27   
830-538 9 CSVLTXCTDS0  9533 SOUTHWESTERN BELL 566      

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Last updated: Thu, 05 Feb 2026 23:41:55 UTC

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