Prefix Information
The prefix 621 is part of area code 410 serving Baltimore, Maryland.
This exchange contains 10,000 possible phone numbers (410-621-0000 through 410-621-9999).
Phone numbers with prefix 621 in area code 410. Location: Baltimore, Maryland.
The prefix 621 is part of area code 410 serving Baltimore, Maryland.
This exchange contains 10,000 possible phone numbers (410-621-0000 through 410-621-9999).