Area: The area code.

Time: The time zone the area code is in.

-3.5: Newfoundland--GMT minus 3.5 hours. 1.5 hours ahead of EST
-04: Atlantic (East Coast Canada) and most of Caribbean. GMT minus 4 hours. One hour ahead of EST
EST: Eastern Standard Time (East Coast USA). Greenwich Mean Time (GMT) minus 5 hours
CST: Central Standard Time. GMT minus 6 hours
MST: Mountain Standard Time. GMT minus 7 hours
PST: Pacific Standard Time. (West Coast USA) GMT minus 8 hours
-09: Alaska. GMT minus 9 hours. One hour behind PST.
-10: Hawaii. GMT minus 10 hours. Two hours behind PST.
City: A major city in that area code.

State-Province-Country: These are codes are within states (USA), provinces, or island nations in the Caribbean.

Notes: Some area codes have notes related to them, such as the date that the area code will be introduced.