Prefix Information
The prefix 331 is part of area code 503 serving Portland, Oregon.
This exchange contains 10,000 possible phone numbers (503-331-0000 through 503-331-9999).
Phone numbers with prefix 331 in area code 503. Location: Portland, Oregon.
The prefix 331 is part of area code 503 serving Portland, Oregon.
This exchange contains 10,000 possible phone numbers (503-331-0000 through 503-331-9999).