A new area code is coming to western and central Illinois.
The Illinois Commerce Commission says the new 447 area code will overlay the
existing 217 area code to address depletion of prefixes available for assignment
in the area. The new area code will not be introduced until after March 29 of
2021. The 217 area code is one of the original 86 area codes in the United States assigned by Bell Laboratories in 1947. There are now 335 area codes in use within the U.S.