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North Potomac, Maryland Area Code |
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North Potomac, MD Area Codes are 240, 301 |
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North Potomac, MD is currently using two area codes 240 and 301. In addition to North Potomac, MD, area codes 240 and 301
serves all of western Maryland. North 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 North 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 North Potomac when it was put
into service on June 1, 1947. Ten digit dialing (area code + seven digit number) is necessary in North 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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