Sometime in the next five years or so, some southern Arizona residents are going to find out that their new neighbors have a different area code.

The 520 area code received a few more years of life as Southern Arizona's solo area code after Arizona Corporation Commission ...

Tucson residents are among millions of Arizonans who will have to start dialing the area code along with the local seven-digit number when making phone calls this Sunday. The change — made to ...