Maryland Area Code Information

Maryland Area Codes

Maryland Area Code Overlays
(301 and 240) - (410 and 443 and 667)

Maryland is currently using five area codes. Maryland is utilizing two area code overlay plans, often called overlay complexes.

Maryland originally had one area code, 301, when the numbering system was established in 1947. It was not until forty-four years later in 1991 that Maryland experienced sufficient growth in population and telephone use to need an additional area code. To meet this increase in demand area code 301 was split to form area code 410. Later in 1997 area code 301 was overlaid with area code 240 and area code 410 was overlaid with area code 443. These changes resulted in four area codes being utilized in Maryland by 1997. In 2012 Maryland added area code 667 as an overlay of area codes 410/443/667.

Changes and History of Maryland Area Codes:

Area code 301 was put into service. In 1991 area code 301 was split to form area code 410. In 1997 area codes 301 was overlaid with area code 240.

Area code 410 was put into service. Area code 410 was created from a split of area code 301. In 1997 area code 410 was overlaid with area code 443.

Area code 240 was put into service. Area code 240 is an overlay of area code 301.

Area code 443 was put into service. Area code 443 is an overlay of area code 410.

Area code 667 was put into service as an overlay of area code 443 and 410. The new overlay plan is 410/443/667.

not in service
Area code 227 is proposed as an overlay of area code 240 and 301 but is not yet in service. When area code 227 is implemented the new overlay plan, or complex, will be 301/240/227.

Related pages

franklin tn codeswhere is topeka indiana619 country codewhere is area code 412 fromtime zone elizabethtown kyarea code 305 locationwhere is the area code 727 locatedallenton michigankingcome inlet bcdresden area codebangor area codearea codes phoenixzanesville ohio area codewhat is the area code 647what area code is 941 citywoolwine virginiajeffersonville in timezonewhere is area code 857 located702 area code location zip codewhere is area code 925 fromtulsa oklahoma area codesringwood area code928 phone area code720area codewhite top vawhat area code is 514 in usaarea codes for south dakota07974 area codewhat city is area code 650where is 1-855 area codefreehold area codegreenbank washingtonwhere is area code 334 fromwhere is the 828 area codesulphur la area codetelephone area code 484fort riley area codeorlando florida codequesnel bc phone bookfort knox area codearea code 775 citythorsby alberta516 timezoneinternational dialing code hong kongel dorado area codedialling code for ontario canadazip code for tyndall afb flstorrs area code435 area code time zone817 area code time zonewhere is the area code 602area code alberta canadagranville north dakotamelbourne dialling codeaz area codesbismarck north dakota time zone978 phone area codekeene area codelocation of area code 678capron virginiadenton tx zip code maparea code for fayetteville ncpost falls idaho time zonegeneseo area codesolon area codearea code 418 maparea code for scarea code 845 timezonewhere is area code 858seneca falls ny zip code0208 area codewhere is 919 area code locatedsouthaven area codearea codes for louisianaann arbor michigan time zonetelephone area code 734bal harbour new jerseychatham quebec