A United States city phone code, commonly referred to as an area code, can be identified online from various websites including Country Code. The area code is a three-digit number that is assigned to a specific area and is preceded by the number one and followed by the seven-digit telephone number when dialing outside of the area.
In order to identify area codes online:
- Look up desired area code by city
- Determine city of an area code
Area codes are arranged either numerically or alphabetically by city. Lists can be found in phone books or online.
If a cell phone or caller identification number originates from a certain area code, the area code's location can be found by the same means: phone book or online. The area code can also be entered into a search engine to obtain its origination.