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Phone Directory 301-556 Detail

State Major City Time Zone
Maryland Baltimore Eastern

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
301-556 Gaithersburg, MD Teleport Communications America - DC Montgomery Landline 10/11/1997

Other Series For Prefixes

301-5560###
301-5561###
301-5562###
301-5563###
301-5564###
301-5565###
301-5566###
301-5567###
301-5568###
301-5569###