The western portion of Maryland, USA, at the moment utilizing a Numbering Plan Space overlay complicated comprising space codes 301 and 240 will, beginning June 14, 2023, use a 3rd space code 227, additionally overlaying this identical geographic space. Among the cities and cities at the moment served by NPAs 301/240: Bethesda, Gaithersburg, Germantown, Frederick, Silver Spring and Waldorf.
Already utilizing overlaying space codes, the dialing plan on this a part of Maryland requires 10 digit dialing for native calls and 1+10 digits for toll calls originating right here. This dialing plan won’t change with the brand new NPA’s addition.
See official NANPA announcement and rate center map of the future overlay complex 301/240/227 (PDF doc).
Go to area code 227 web page for a listing of cities served, map and different data.