Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

Switch: WASHDCCZDS0

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
202-204 A Washington Zone 1 DC 8964 XO D.C., INC. 236      
202-207 A Washington Zone 1 DC 8964 XO D.C., INC. 236      
202-315 A Washington Zone 1 DC 8964 XO D.C., INC. 236      
202-330 A Washington Zone 1 DC 8964 XO D.C., INC. 236      
202-351 A Washington Zone 1 DC 8964 XO D.C., INC. 236      
202-355 A Washington Zone 1 DC 8964 XO D.C., INC. 236      
202-379 A Washington Zone 1 DC 8964 XO D.C., INC. 236      
202-380 A Washington Zone 1 DC 8964 XO D.C., INC. 236      
202-403 A Washington Zone 1 DC 8964 XO D.C., INC. 236      
202-446 A Washington Zone 1 DC 8964 XO D.C., INC. 236      
202-459 A Washington Zone 1 DC 8964 XO D.C., INC. 236      
202-827 A Washington Zone 1 DC 8964 XO D.C., INC. 236   2011-04-02   
240-206 A Washington Zone 14 MD 4773 XO MARYLAND, LLC 236      
240-294 A Laurel MD 4773 XO MARYLAND, LLC 236      
240-399 A Washington Zone 10 MD 4773 XO MARYLAND, LLC 236      
240-404 A Gaithersburg MD 4773 XO MARYLAND, LLC 236      
240-427 A Waldorf MD 4773 XO MARYLAND, LLC 236      
240-437 A Ashton MD 4773 XO MARYLAND, LLC 236      
240-489 A Poolesville MD 4773 XO MARYLAND, LLC 236      
240-510 A Washington Zone 15 MD 4773 XO MARYLAND, LLC 236      
240-523 A La Plata MD 4773 XO MARYLAND, LLC 236      
240-538 A Leonardtown MD 4773 XO MARYLAND, LLC 236      
240-560 A Washington Zone 12 MD 4773 XO MARYLAND, LLC 236      
240-644 A Washington Zone 2 MD 4773 XO MARYLAND, LLC 236      
240-645 A Washington Zone 3 MD 4773 XO MARYLAND, LLC 236      
240-652 A Mechanicsville MD 4773 XO MARYLAND, LLC 236      
240-718 A Lexington Park-Great Mills MD 4773 XO MARYLAND, LLC 236      
240-745 A Damascus MD 4773 XO MARYLAND, LLC 236      
240-764 A Washington Zone 4 MD 4773 XO MARYLAND, LLC 236      
240-765 A Washington Zone 5 MD 4773 XO MARYLAND, LLC 236      
240-766 A Washington Zone 6 MD 4773 XO MARYLAND, LLC 236      
240-778 A Washington Zone 10 MD 4773 XO MARYLAND, LLC 236      
240-804 A Tompkinsville MD 4773 XO MARYLAND, LLC 236      
240-823 A Brandywine MD 4773 XO MARYLAND, LLC 236      
240-833 A Washington Zone 11 MD 4773 XO MARYLAND, LLC 236      
240-837 A Hughesville MD 4773 XO MARYLAND, LLC 236      
240-844 A Ridge MD 4773 XO MARYLAND, LLC 236      
240-845 A Washington Zone 13 MD 4773 XO MARYLAND, LLC 236      
240-846 A Washington Zone 16 MD 4773 XO MARYLAND, LLC 236      
240-986 A Nanjemoy MD 4773 XO MARYLAND, LLC 236      
240-993 A Indian Head MD 4773 XO MARYLAND, LLC 236      
703-373 A Washington Zone 8 VA 4772 XO VIRGINIA, LLC 236      
703-542 A Arcola VA 4772 XO VIRGINIA, LLC 236      
703-543 A Braddock VA 4772 XO VIRGINIA, LLC 236      
703-544 A Dulles VA 4772 XO VIRGINIA, LLC 236      
703-546 A Engleside VA 4772 XO VIRGINIA, LLC 236      
703-547 A Herndon VA 4772 XO VIRGINIA, LLC 236      
703-552 A Dulles Metro VA 4772 XO VIRGINIA, LLC 236      
703-562 A Washington Zone 8 VA 4772 XO VIRGINIA, LLC 236      
703-563 A Washington Zone 19 VA 4772 XO VIRGINIA, LLC 236      

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Last updated: Sat, 08 Jun 2019 01:52:21 UTC

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