Prefix Information
The prefix 991 is part of area code 217 serving Springfield, Illinois.
This exchange contains 10,000 possible phone numbers (217-991-0000 through 217-991-9999).
Phone numbers with prefix 991 in area code 217. Location: Springfield, Illinois.
The prefix 991 is part of area code 217 serving Springfield, Illinois.
This exchange contains 10,000 possible phone numbers (217-991-0000 through 217-991-9999).