Prefix Information
The prefix 421 is part of area code 667 serving Baltimore, Maryland.
This exchange contains 10,000 possible phone numbers (667-421-0000 through 667-421-9999).
Phone numbers with prefix 421 in area code 667. Location: Baltimore, Maryland.
The prefix 421 is part of area code 667 serving Baltimore, Maryland.
This exchange contains 10,000 possible phone numbers (667-421-0000 through 667-421-9999).