Area Code Details for: 301

Location

State

Maryland

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Details

State	Maryland (MD)
Time Zone
Parent NPA	-
Relief Planning in ProgressArea code relief planning is the process of addressing the exhaustion of available telephone numbers within an area code. When the supply of numbers in an existing area code is running low, NANPA works with the telecommunications industry to introduce new area codes.	No
In Service Date	January 1, 1947

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Cities

Zipcode	City	County
20886	Gaithersburg, MD	Montgomery
20913	Silver Spring, MD	Montgomery
20622	Charlotte Hall, MD	Saint Mary's

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