A specific three-digit number, followed by seven additional digits, designates a geographic region for telephone communication. This numerical assignment helps to route calls to the correct local exchange. For example, calls dialed with the digits 240 are directed towards a defined area.
Understanding the association of these digits with a particular place is useful for various reasons. Businesses may utilize this knowledge for targeted marketing efforts. Individuals could employ it to identify the general source of an incoming call. Historically, area codes were implemented to streamline long-distance calling and manage the growing demand for telephone lines.