Prefix Information
The prefix 311 is part of area code 410 serving Baltimore, Maryland.
This exchange contains 10,000 possible phone numbers (410-311-0000 through 410-311-9999).
Phone numbers with prefix 311 in area code 410. Location: Baltimore, Maryland.
The prefix 311 is part of area code 410 serving Baltimore, Maryland.
This exchange contains 10,000 possible phone numbers (410-311-0000 through 410-311-9999).