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Area code 423 - Wikipedia
423 area code - Wikipedia
List of Tennessee area codes - Wikipedia
423 Area Code - Location, Time, Map, Cities and Census Data - ZIP-Codes.com
About: Area code 423 - DBpedia Association
423 Area Code - Map, Phone Lookup, Time Zone | Wirefly
423 area code — information, time zone, map
Area Code 423 - Tennessee - Zipdatamaps
423 Area Code - Location, time zone, and phone lookup
List of North American Numbering Plan area codes
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