301-666 phone numbers

Numbers 301-666-0000 to 301-666-9999 are assigned to Teleport Communications America, LLC (rate centre WSNG236Z14, MD, NANPA abbreviation). 9 of its ten thousand-number blocks are assigned to other carriers (number pooling).

Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.

Reported numbers in 301-666