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NPA: 301 [Rate centres in NPA 301] [Dial plan for NPA 301]

Block: A

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NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
301-554 A Washington Zone 2 MD SLSPMDSSX6X  6630 SPOK, INC. 236      
301-556 A Gaithersburg MD WASHDCTTDS0  7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-557 A Washington Zone 3 MD MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236      
301-558 A Washington Zone 13 MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2025-08-28   
301-559 A Washington Zone 4 MD HYVLMDCMDS0  9212 VERIZON MARYLAND, INC. 236      
301-560 A Washington Zone 4 MD   829J PAETEC ITEL, LLC 236   2025-04-02   
301-561 A Washington Zone 3 MD VINNVACB2MD  8697 BALTIMORE-WASHINGTON TELEPHONE (BWT) 236      
301-562 A Washington Zone 3 MD SLSPMDSSDS0  9212 VERIZON MARYLAND, INC. 236      
301-563 A Washington Zone 3 MD SLSPMDSSDS0  9212 VERIZON MARYLAND, INC. 236      
301-564 A Washington Zone 2 MD BTHSMDWWDS0  9212 VERIZON MARYLAND, INC. 236      
301-565 A Washington Zone 3 MD SLSPMDSSDS0  9212 VERIZON MARYLAND, INC. 236      
301-566 A Washington Zone 13 MD MRKKMDMKDS0  9212 VERIZON MARYLAND, INC. 236      
301-567 A Washington Zone 6 MD OXHLMDOHDS0  9212 VERIZON MARYLAND, INC. 236      
301-568 A Washington Zone 5 MD STLDMDSLDS0  9212 VERIZON MARYLAND, INC. 236      
301-569 A Gaithersburg MD WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236      
301-570 A Ashton MD OLNYMDOKRP0  9212 VERIZON MARYLAND, INC. 236      
301-571 A Washington Zone 2 MD BTHSMDWWDS0  9212 VERIZON MARYLAND, INC. 236      
301-572 A Washington Zone 3 MD BTVLMDBVDS0  9212 VERIZON MARYLAND, INC. 236      
301-573 A Hagerstown MD FRDRMDFRKMD  5562 METROPCS, INC. 240      
301-574 A Washington Zone 15 MD MRBOMDMBDS0  9212 VERIZON MARYLAND, INC. 236      
301-575 A Laurel MD   829J PAETEC ITEL, LLC 236   2025-04-02   
301-576 A Washington Zone 3 MD   829J PAETEC ITEL, LLC 236   2025-04-02   
301-577 A Washington Zone 4 MD LNHMMDLNDS0  9212 VERIZON MARYLAND, INC. 236      
301-578 A Washington Zone 3 MD SLSPMDSSDS0  9212 VERIZON MARYLAND, INC. 236      
301-579 A Brandywine MD BADNMDBNRS0  9212 VERIZON MARYLAND, INC. 236      
301-580 A Washington Zone 3 MD WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236      
301-581 A Washington Zone 2 MD BTHSMDWWDS0  9212 VERIZON MARYLAND, INC. 236      
301-582 A Hagerstown MD WLPTMDWPRS2  9212 VERIZON MARYLAND, INC. 240      
301-583 A Washington Zone 4 MD LDVRMDLODS0  9212 VERIZON MARYLAND, INC. 236      
301-584 A Washington Zone 12 MD VINNVACB2MD  8697 BALTIMORE-WASHINGTON TELEPHONE (BWT) 236      
301-585 A Washington Zone 3 MD SLSPMDSSDS0  9212 VERIZON MARYLAND, INC. 236      
301-586 A Washington Zone 3 MD BTVLMDBVDS0  9212 VERIZON MARYLAND, INC. 236      
301-587 A Washington Zone 3 MD SLSPMDSSDS0  9212 VERIZON MARYLAND, INC. 236      
301-588 A Washington Zone 3 MD SLSPMDSSDS0  9212 VERIZON MARYLAND, INC. 236      
301-589 A Washington Zone 3 MD SLSPMDSSDS0  9212 VERIZON MARYLAND, INC. 236      
301-590 A Washington Zone 10 MD GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236      
301-591 A Gaithersburg MD   829J PAETEC ITEL, LLC 236   2025-04-02   
301-592 A Washington Zone 3 MD SLSPMDNWDS0  9212 VERIZON MARYLAND, INC. 236      
301-593 A Washington Zone 3 MD SLSPMDNWDS0  9212 VERIZON MARYLAND, INC. 236      
301-594 A Washington Zone 2 MD BTHSMDRPDS0  9212 VERIZON MARYLAND, INC. 236      
301-595 A Washington Zone 13 MD BTVLMDBVDS0  9212 VERIZON MARYLAND, INC. 236      
301-596 A Laurel (Baltimore LATA) MD CLMAMDCBRP0  9212 VERIZON MARYLAND, INC. 238      
301-597 A Waldorf MD BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236      
301-598 A Washington Zone 12 MD SLSPMDNBDS0  9212 VERIZON MARYLAND, INC. 236      
301-599 A Washington Zone 5 MD CLTNMDCLDS0  9212 VERIZON MARYLAND, INC. 236      
301-600 A Frederick MD FRDRMDFRDS1  9212 VERIZON MARYLAND, INC. 240      
301-601 A Washington Zone 10 MD GMTWMDGNDS0  9212 VERIZON MARYLAND, INC. 236      
301-602 A Washington Zone 3 MD WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236      
301-603 A Washington Zone 11 MD SLSPMDNBDS0  9212 VERIZON MARYLAND, INC. 236      
301-604 A Laurel MD LARLMDLRDS0  9212 VERIZON MARYLAND, INC. 236      

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Last updated: Sun, 17 May 2026 03:26:51 UTC

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