Prefix Information
The prefix 340 is part of area code 202 serving Washington, Washington DC.
This exchange contains 10,000 possible phone numbers (202-340-0000 through 202-340-9999).
Phone numbers with prefix 340 in area code 202. Location: Washington, Washington DC.
The prefix 340 is part of area code 202 serving Washington, Washington DC.
This exchange contains 10,000 possible phone numbers (202-340-0000 through 202-340-9999).