a three-digit code that identifies one of the telephone areas into which the U.S. and certain other countries are divided and that precedes the local telephone number when dialing a call between areas.
A three-digit number assigned to a geographical area in the United States, Canada, and the Caribbean, used before a seven-digit telephone number when placing a call to, and sometimes from within, that area.
A similar number of varying length assigned to geographic areas in other parts of the world.
