Prefix Information
The prefix 991 is part of area code 413 serving Springfield, Massachusetts.
This exchange contains 10,000 possible phone numbers (413-991-0000 through 413-991-9999).
Phone numbers with prefix 991 in area code 413. Location: Springfield, Massachusetts.
The prefix 991 is part of area code 413 serving Springfield, Massachusetts.
This exchange contains 10,000 possible phone numbers (413-991-0000 through 413-991-9999).