400 Area Code

The 400 area code is NOT a valid area code. This area code is NOT officially assigned to a known Numbering Plan Area (NPA). The 400 area code is not assigned to a city/state location.

In most cases with invalid area codes like 400, tend to be used by phone numbers from telemarketing companies.

Last Searched Area Codes
Area CodeCity/State
315Lowville, New York
573Durham, Missouri
859Florence, Kentucky