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: WASHDC12NMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
227-229 4 Washington Zone 4 MD 490J BOOST SUBSCRIBERCO L.L.C. 236   2024-04-11   
227-229 5 Washington Zone 4 MD 490J BOOST SUBSCRIBERCO L.L.C. 236   2024-08-31   
227-231 8 Washington Zone 6 MD 490J BOOST SUBSCRIBERCO L.L.C. 236   2024-08-26   
227-245 2 Gaithersburg MD 490J BOOST SUBSCRIBERCO L.L.C. 236   2024-10-24   
227-245 3 Gaithersburg MD 490J BOOST SUBSCRIBERCO L.L.C. 236   2025-01-20   
227-245 4 Gaithersburg MD 490J BOOST SUBSCRIBERCO L.L.C. 236   2026-02-09   
227-265 9 Washington Zone 3 MD 490J BOOST SUBSCRIBERCO L.L.C. 236   2025-05-26   
227-275 4 Washington Zone 4 MD 490J BOOST SUBSCRIBERCO L.L.C. 236   2026-01-18   
227-275 5 Washington Zone 4 MD 490J BOOST SUBSCRIBERCO L.L.C. 236   2026-02-24   
227-302 A Washington Zone 4 MD 490J BOOST SUBSCRIBERCO L.L.C. 236   2026-06-04   
227-302 0 Washington Zone 4 MD 490J BOOST SUBSCRIBERCO L.L.C. 236   2026-06-04   
227-302 1 Washington Zone 4 MD 490J BOOST SUBSCRIBERCO L.L.C. 236   2026-07-28   
227-302 2 Washington Zone 4 MD 490J BOOST SUBSCRIBERCO L.L.C. 236   2026-08-25   
227-302 3 Washington Zone 4 MD 490J BOOST SUBSCRIBERCO L.L.C. 236   2026-09-28   
227-727 2 Washington Zone 6 MD 490J BOOST SUBSCRIBERCO L.L.C. 236   2026-01-13   
227-727 3 Washington Zone 6 MD 490J BOOST SUBSCRIBERCO L.L.C. 236   2026-02-10   
227-772 4 Washington Zone 4 MD 490J BOOST SUBSCRIBERCO L.L.C. 236   2025-02-24   
227-772 5 Washington Zone 4 MD 490J BOOST SUBSCRIBERCO L.L.C. 236   2025-04-28   
227-772 6 Washington Zone 4 MD 490J BOOST SUBSCRIBERCO L.L.C. 236   2025-06-23   
240-209 1 Indian Head MD 490J BOOST SUBSCRIBERCO L.L.C. 236   2024-02-24   
240-438 5 Washington Zone 3 MD 490J BOOST SUBSCRIBERCO L.L.C. 236   2024-08-26   
240-884 0 Tompkinsville MD 490J BOOST SUBSCRIBERCO L.L.C. 236   2023-03-12   
240-894 A Lexington Park-Great Mills MD 490J BOOST SUBSCRIBERCO L.L.C. 236      
240-894 8 Lexington Park-Great Mills MD 490J BOOST SUBSCRIBERCO L.L.C. 236   2022-06-06   
240-926 2 Hughesville MD 490J BOOST SUBSCRIBERCO L.L.C. 236   2023-05-20   
240-940 5 Washington Zone 4 MD 490J BOOST SUBSCRIBERCO L.L.C. 236   2023-07-13   
240-968 1 Laurel MD 490J BOOST SUBSCRIBERCO L.L.C. 236   2023-03-12   
240-981 3 Gaithersburg MD 490J BOOST SUBSCRIBERCO L.L.C. 236   2024-01-21   
301-844 3 Washington Zone 3 MD 490J BOOST SUBSCRIBERCO L.L.C. 236   2026-07-24   
540-873 1 Stafford VA 490J BOOST SUBSCRIBERCO L.L.C. 236   2022-09-08   
571-603 0 Washington Zone 17 VA 490J BOOST SUBSCRIBERCO L.L.C. 236   2023-03-12   
571-603 2 Washington Zone 17 VA 490J BOOST SUBSCRIBERCO L.L.C. 236   2023-07-17   
571-630 4 Washington Zone 17 VA 490J BOOST SUBSCRIBERCO L.L.C. 236   2024-05-01   
571-630 5 Washington Zone 17 VA 490J BOOST SUBSCRIBERCO L.L.C. 236   2024-06-01   
571-630 6 Washington Zone 17 VA 490J BOOST SUBSCRIBERCO L.L.C. 236   2024-07-07   
571-671 5 Engleside VA 490J BOOST SUBSCRIBERCO L.L.C. 236   2024-05-07   
571-671 7 Engleside VA 490J BOOST SUBSCRIBERCO L.L.C. 236   2024-08-30   
571-691 A Washington Zone 17 VA 490J BOOST SUBSCRIBERCO L.L.C. 236   2024-12-26   
571-691 0 Washington Zone 17 VA 490J BOOST SUBSCRIBERCO L.L.C. 236   2024-12-26   
571-691 1 Washington Zone 17 VA 490J BOOST SUBSCRIBERCO L.L.C. 236   2025-09-29   
571-691 2 Washington Zone 17 VA 490J BOOST SUBSCRIBERCO L.L.C. 236   2025-02-18   
571-691 3 Washington Zone 17 VA 490J BOOST SUBSCRIBERCO L.L.C. 236   2025-02-18   
571-691 4 Washington Zone 17 VA 490J BOOST SUBSCRIBERCO L.L.C. 236   2025-04-19   
571-717 6 Washington Zone 17 VA 490J BOOST SUBSCRIBERCO L.L.C. 236   2025-10-27   
571-736 4 Washington Zone 17 VA 490J BOOST SUBSCRIBERCO L.L.C. 236   2025-12-18   
571-736 6 Washington Zone 17 VA 490J BOOST SUBSCRIBERCO L.L.C. 236   2026-01-26   
571-749 6 Washington Zone 17 VA 490J BOOST SUBSCRIBERCO L.L.C. 236   2026-07-13   
703-226 7 Washington Zone 17 VA 490J BOOST SUBSCRIBERCO L.L.C. 236   2026-08-17   

Last updated: Thu, 16 Jul 2026 02:21:55 UTC

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