The 666 area code is located in Illinois.
The 666 area code is a part of the Chicago metropolitan area. It covers several cities and towns in the state, including:
- Chicago
- Aurora
- Joliet
- Naperville
- Schaumburg
- Wheaton
The 666 area code was introduced in 2021 to address the growing demand for phone numbers in the Chicago area.
Note: The 666 area code is not associated with any negative connotations or religious beliefs. It's simply a geographical identifier.
