A typical abbreviation for Coal Harbour: Coal Hbr. (or less commonly used: Coal Harb. or Coal Hrbr.)
Time Zone: Coal Harbour lies in the Newfoundland Time Zone (NST/NDT) and observes daylight saving time. The time zone in French: NST- Heure Normale de Terre-Neuve (HNT), NDT- Heure Avancée de Terre-Neuve (HAT).
When there's a risk of an area code running out of phone numbers, an 'Overlay Area Code' is created that has the same geographic boundaries as the existing area code. In this case, the 709 code has been Overlayed with the 879 area code. New phone numbers in the Coal Harbour area will be assigned with one of these codes: 709 or 879. As a result, placing a call in the Coal Harbour area will require 10-digit dialing (where you enter both the area code and then the phone number).