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Phone Directory 301-428 Detail

State Major City Time Zone
Maryland Baltimore Eastern

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
301-428 Gaithersburg, MD Verizon Maryland Montgomery Landline 02/04/1994

Other Series For Prefixes

301-4280###
301-4281###
301-4282###
301-4283###
301-4284###
301-4285###
301-4286###
301-4287###
301-4288###
301-4289###