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Phone Number Data for 301-640-xxxx Numbers


The 301-640 exchange is serviced by the following companies within the WSNGTNZN10 ratecenter.

Calls are routed via OCN 9212 on a WECO 5ESS (Digital) switch located in the Gaithersburg, Maryland area.


Approximate Location of 301-640-xxxx Numbers



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Valid 301-640-xxxx Local Exchanges



(301-638 Waldorf) (301-639 Frederick) (301-641 Washington) (301-642 Bethesda)