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.

Baltimore, MD

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 >>

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
667-461 4 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2024-12-31   
667-461 5 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2024-12-31   
667-461 6 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2024-12-31   
667-461 7 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2024-08-10   
667-461 8 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2024-08-10   
667-461 9 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2024-08-10   
667-464 A BLTQMD01BMD  516J TON80 COMMUNICATIONS, LLC 238      
667-464 0 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2022-05-06   
667-464 1 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2022-05-06   
667-464 2 BLTQMD01BMD  516J TON80 COMMUNICATIONS, LLC 238   2022-04-03   
667-464 3 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2022-05-22   
667-464 4 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2022-05-22   
667-464 5 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2022-05-06   
667-464 6 BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238   2022-04-04   
667-464 7 BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238   2022-04-04   
667-464 8 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2022-05-06   
667-464 9 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2022-05-06   
667-487 A BLTMMDSNJMD  475J CALLWORKS CORPORATION 238   2024-07-11   
667-487 0 BLTQMD019MD  490J BOOST SUBSCRIBERCO L.L.C. 238   2024-10-16   
667-487 1 BLTMMDSNJMD  475J CALLWORKS CORPORATION 238   2024-07-11   
667-487 2 BLTQMD019MD  490J BOOST SUBSCRIBERCO L.L.C. 238   2024-12-16   
667-487 3 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2024-11-17   
667-487 4 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2024-11-17   
667-487 5 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2024-11-17   
667-487 6 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2024-11-17   
667-487 7 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2024-11-17   
667-487 8 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2024-11-17   
667-487 9 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2024-11-17   
667-495 A BLTQMD01GMD  616J LEAP TELECOM, LLC 238   2024-12-28   
667-495 0 BLTQMD01GMD  616J LEAP TELECOM, LLC 238   2024-12-28   
667-495 1 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2024-12-31   
667-495 2 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2024-12-31   
667-495 3 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2024-12-31   
667-495 4 BLTQMD019MD  490J BOOST SUBSCRIBERCO L.L.C. 238   2025-01-31   
667-495 5 BLTQMD019MD  490J BOOST SUBSCRIBERCO L.L.C. 238   2025-02-24   
667-495 6 BLTQMD019MD  490J BOOST SUBSCRIBERCO L.L.C. 238   2025-03-24   
667-495 7 BLTQMD019MD  490J BOOST SUBSCRIBERCO L.L.C. 238   2025-04-28   
667-495 8 BLTQMD019MD  490J BOOST SUBSCRIBERCO L.L.C. 238   2025-05-26   
667-495 9 BLTQMD019MD  490J BOOST SUBSCRIBERCO L.L.C. 238   2025-06-23   
667-503 A BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238   2025-03-22   
667-503 0 BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238   2025-03-22   
667-503 1 BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238   2025-03-22   
667-503 2 BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238   2025-03-22   
667-503 3 BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238   2025-03-22   
667-503 4 BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238   2025-03-22   
667-503 5 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-03-24   
667-503 6 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2025-03-24   
667-503 7 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2025-03-24   
667-503 8 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2025-03-24   
667-503 9 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2025-03-24   
667-504 A CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-03-27   
667-504 0 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-03-28   
667-504 1 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-03-28   
667-504 2 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-03-28   
667-504 3 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-03-27   
667-504 4 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-03-27   
667-504 5 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-03-27   
667-504 6 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-03-27   
667-504 7 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-03-27   
667-504 8 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-03-27   
667-504 9 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-03-27   
667-506 A CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-05-04   
667-506 0 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2025-05-05   
667-506 1 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2025-05-05   
667-506 2 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-05-04   
667-506 3 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-05-04   
667-506 4 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-05-04   
667-506 5 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-05-04   
667-506 6 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-05-04   
667-506 7 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-05-04   
667-506 8 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-05-04   
667-506 9 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-05-04   
667-513 A BLTQMD01GMD  616J LEAP TELECOM, LLC 238   2025-07-17   
667-513 0 BLTQMD01GMD  616J LEAP TELECOM, LLC 238   2025-07-17   
667-513 1 BLTQMD01GMD  616J LEAP TELECOM, LLC 238   2025-07-17   
667-513 2 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-07-18   
667-513 3 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-07-18   
667-513 4 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-07-18   
667-513 5 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-07-18   
667-513 6 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-07-18   
667-513 7 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-07-18   
667-513 8 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-07-18   
667-513 9 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-07-18   
667-514 A CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-07-04   
667-514 0 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-07-04   
667-514 1 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-07-04   
667-514 2 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-07-04   
667-514 3 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-07-04   
667-514 4 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-07-04   
667-514 5 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-07-04   
667-514 6 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-07-04   
667-514 7 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-07-04   
667-514 8 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-07-04   
667-514 9 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-07-04   
667-515 A CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-07-21   
667-515 0 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-07-21   
667-515 1 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-07-21   
667-515 2 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-07-21   
667-515 3 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-07-21   
667-515 4 CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-07-21   

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 >>

Last updated: Sat, 01 Aug 2026 03:19:33 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.