Area Codes
| 667 | Maryland This Area code is scheduled to provide numbering relief to Area code 443 but no date has been assigned for this to go into effect. | More information at: Area Code 667 Phone Number Blocks
| 667 | Maryland This Area code is scheduled to provide numbering relief to Area code 443 but no date has been assigned for this to go into effect. | More information at: Area Code 667 Phone Number Blocks