Prefix Information
The prefix 503 is part of area code 421 serving Unknown, Unknown.
This exchange contains 10,000 possible phone numbers (421-503-0000 through 421-503-9999).
Phone numbers with prefix 503 in area code 421. Location: Unknown, Unknown.
The prefix 503 is part of area code 421 serving Unknown, Unknown.
This exchange contains 10,000 possible phone numbers (421-503-0000 through 421-503-9999).