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Potomac, Maryland Area Code |
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Potomac, MD Area Codes are 240, 301 |
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Potomac, MD is currently using two area codes 240 and 301. In addition to Potomac, MD, area codes 240 and 301 serves all
of western Maryland. Potomac, Maryland utilizes an area code overlay in which area codes 240 and 301 serve the same geographic area. The area code overlay which serves Potomac, MD was put into service on
June 1, 1997 at which time area code 240 was created as an overlay of area code 301. Area code 301 originally covered the entire state of Maryland, including Potomac when it was put into service on June 1,
1947. Ten digit dialing (area code + seven digit number) is necessary in Potomac, MD because two different homes in the same geographic area can have the same seven digit phone number but each would
have a different area code. |
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Maryland Area Codes |
240, 301, 410, 443 |
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