Prefix Information
The prefix 991 is part of area code 509 serving Spokane, Washington.
This exchange contains 10,000 possible phone numbers (509-991-0000 through 509-991-9999).
Phone numbers with prefix 991 in area code 509. Location: Spokane, Washington.
The prefix 991 is part of area code 509 serving Spokane, Washington.
This exchange contains 10,000 possible phone numbers (509-991-0000 through 509-991-9999).