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  1. Area codes 815 and 779 - Wikipedia

  2. List of North American Numbering Plan area codes

  3. Area code 815 - Wikipedia

  4. List of Illinois area codes - Wikipedia

  5. About: Area codes 815 and 779 - DBpedia Association

  6. 815 Area Code - Map, Phone Lookup, Time Zone | Wirefly

  7. 815 area code — information, time zone, map

  8. 815 Area Code - Location, Time, Map, Cities and Census Data - ZIP-Codes.com

  9. Exploring the Vibrant Communities of Area Code 815

  10. 815 Area Code - Location, Cities and Time Zone - ZipCodes.org

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