215. 267, 412, 484, 570, 610, 717, 724, 814 & 878 = 10 area codes
Pennsylvania has several area codes. You need to ask about a specific city.
Area codes 484, 610 and 835 are Commonwealth of Pennsylvania telephone area codes which serve the Southeast region of the state including the cities of Allentown, Bethlehem, and Reading, along with much of the Delaware Valley(excluding Philadelphia).
The area code 215 is the North American telephone area code for the Commonwealth of Pennsylvania. The area code 215 was one of the original area codes established in 1947.
six area codes: 928 602 623 480 520
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.
26
about 23
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.
There are many area code listings on the internet.
the only area code is 605
One: 802
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.