Prefix Information
The prefix 991 is part of area code 520 serving Tucson, Arizona.
This exchange contains 10,000 possible phone numbers (520-991-0000 through 520-991-9999).
Phone numbers with prefix 991 in area code 520. Location: Tucson, Arizona.
The prefix 991 is part of area code 520 serving Tucson, Arizona.
This exchange contains 10,000 possible phone numbers (520-991-0000 through 520-991-9999).