← Area code 301
301-663 phone numbers
Numbers 301-663-0000 to 301-663-9999 are assigned to Verizon Maryland, Inc. in Frederick, MD.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.
Numbers 301-663-0000 to 301-663-9999 are assigned to Verizon Maryland, Inc. in Frederick, MD.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.