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Phone Directory 301-637 Detail

State Major City Time Zone
Maryland Baltimore Eastern

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Area Code Prefixes

Prefix Primary City Company County Usage Introduced
301-637 Rockville, MD Level 3 Communications Montgomery Landline 08/14/1998

Other Series For Prefixes

301-6370###
301-6371###
301-6372###
301-6373###
301-6374###
301-6375###
301-6376###
301-6377###
301-6378###
301-6379###