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Phone Directory 301-820 Detail

State Major City Time Zone
Maryland Baltimore Eastern

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Example: (301) 820-5555 or 2012145555

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
301-820 Gaithersburg, MD AT&T Local Montgomery Landline 11/20/1998

Other Series For Prefixes

301-8200###
301-8201###
301-8202###
301-8203###
301-8204###
301-8205###
301-8206###
301-8207###
301-8208###
301-8209###