Published: October 11, 2011
A new area code 667 will be activated on March 24, 2012 for the eastern part of Maryland currently served by area codes 410 and overlay area code 443 and covering cities such as Aberdeen, Baltimore, Ellicott City, Dundalk. The introduction of the new code was decided back in 2001. Since this part of Maryland has 2 area codes already and therefore 10 digit dialing has been mandatory since the introduction of area code 443 in 1997, no permissive 10 digit dialing will be needed.
See the official NANPA announcement and map of the new area code (PDF document).
Visit area code 667 page for a list of cities served, map and other info.