United States Information
United States and Canada are part of the North American Numbering Plan (NANP). All NANP countries have country code 1. The general procedure for calling a NANP country is 1 + Area code (3 digits) + TEL # (7 digit)
ISD Code or Country Code of United States is 1
Area code – There are 291 area codes in United States. Dial the area code of the city in the United States you are calling after dialing ISD Code. If there is no area code dial the Recipient’s Telephone Number after ISD Code.
United States Emergency Numbers
911 – Police
911 – Ambulance
911 – Fire
311 – Non-Emergecy
#77 – Highway Patrol from mobile