Prefix Information
The prefix 400 is part of area code 202 serving Washington, Washington DC.
This exchange contains 10,000 possible phone numbers (202-400-0000 through 202-400-9999).
Phone numbers with prefix 400 in area code 202. Location: Washington, Washington DC.
The prefix 400 is part of area code 202 serving Washington, Washington DC.
This exchange contains 10,000 possible phone numbers (202-400-0000 through 202-400-9999).