Area Code 667 History:
Area code 667 was placed into service as an overlay of area codes 443 and 410. Mandatory 10 digit dialing is required.
Ten digit dialing (area code + seven digit number) is necessary in the 410/443/667 overlay because two different homes in the same geographic area can have the same seven digit phone number but each would have a different area code.
Counties in Maryland within area code 667 include:
Anne Arundel County, Baltimore County, Baltimore City County, Calvert County, Caroline County, Carroll County, Cecil County, Dorchester County, Harford County, Howard County, Kent County, Queen Annes County, Somerset County, Talbot County, Wicomico County, and Worcester County.
Major cities or places in Maryland within area code 667 include:
When implemented the area code overlay of 410, 443 and 667 will serve eastern Maryland, including the larger cities and communities of Annapolis, Arbutus, Arnold, Baltimore, Bel Air North, Bel Air South, Carney, Catonsville, Columbia, Crofton, Dundalk, Edgewood, Eldersburg, Elkridge, Ellicott City, Essex, Glen Burnie, Lochearn, Milford Mill, Odenton, Parkville, Perry Hall, Pikesville, Randallstown , Reisterstown, Salisbury, Severn, Severna Park, South Gate, and Towson in addition to many smaller communities.