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Phone Directory 301-603 Detail

State Major City Time Zone
Maryland Baltimore Eastern

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
301-603 Rockville, MD Verizon Maryland Montgomery Landline 07/01/1996

Other Series For Prefixes

301-6030###
301-6031###
301-6032###
301-6033###
301-6034###
301-6035###
301-6036###
301-6037###
301-6038###
301-6039###