As of 2012, Maryland has five area codes.
The southern/western area, including the Washington suburbs, plus Frederick, Hagerstown, and Cumberland, is area codes 301 and 240.
The northern/eastern area, including Baltimore, Annapolis, and the Delmarva Peninsula, is area codes 410, 443, and 667.
Linthicum, Maryland, is in area code 410 and overlay codes 443 and 667. The same three area codes also serve Baltimore and Annapolis.
Catonsville, MD, is in area code +1 410, with overlay area codes +1 443 and +1 667. Those are the same area codes used in nearby Baltimore.
There are dozens of zip codes for Baltimore, Maryland. See the related link.
to send a fax from Philadelphia to Maryland, you need to dial: 1+area code+number the Area Codes for Maryland are 240, 301, 410, 443 if the fax number is 10 digits it already includes the area code, so you just need to put 1 before the number
North American area codes +1 410, +1 443, and +1 667 serve the northeastern half of the state of Maryland, including Baltimore and Annapolis. Area codes 443 and 667 are overlay codes, serving the exact same geographic area as 410.(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
six area codes: 928 602 623 480 520
There is no such place as Baltimore, New York. The area code for New Baltimore, NY, is +1 518.(Baltimore, Maryland, is in area codes 410, 443, and 667.)
There are no ten digit zip codes. Maryland has many five digit zip codes and many many more nine digit zip+4 codes. There can be a unique nine digit zip+4 code for every mailbox in a post office building and for at least every block in a town or city!
Baltimore, Maryland, uses area codes +1 410, +1 443, and +1 667.
There are about 300 area codes in the United States, about 30 in Canada, and about 20 in other miscellaneous islands in or near the Caribbean that share country code +1 with the US and Canada. There are about 400 area codes in Mexico. There are about 600 area codes in the UK. There are about 5,200 area codes in Germany.
There are currently 10 area codes in Ohio. When Ohio needs more area codes they will introduce an eleventh area code for the Columbus/Central Ohio area and a twelfth area code for the Cincinnati region.
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