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Phone Directory 301-378 Detail

State Major City Time Zone
Maryland Baltimore Eastern

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
301-378 Frederick, MD Comcast Phone Of Northern Maryland Frederick Landline 02/20/2007

Other Series For Prefixes

301-3780###
301-3781###
301-3782###
301-3783###
301-3784###
301-3785###
301-3786###
301-3787###
301-3788###
301-3789###