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.

OCN: 876D ONVOY, LLC - 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 >>

NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
240-502 3 Washington Zone 3 MD   236   2024-02-17   
240-502 4 Washington Zone 3 MD   236   2024-02-17   
240-502 5 Washington Zone 3 MD   236   2024-02-17   
240-502 6 Washington Zone 3 MD   236   2024-02-17   
240-502 7 Washington Zone 3 MD   236   2024-02-17   
240-502 9 Washington Zone 3 MD   236   2025-05-29   
240-503 3 Tompkinsville MD   236   2015-06-27   
240-503 4 Tompkinsville MD   236   2016-03-14   
240-503 5 Tompkinsville MD   236   2016-03-14   
240-503 8 Tompkinsville MD   236   2014-10-28   
240-503 9 Tompkinsville MD   236   2014-10-28   
240-512 1 Washington Zone 13 (Baltimore LATA) MD   238   2021-07-12   
240-512 6 Washington Zone 13 (Baltimore LATA) MD   238   2018-05-31   
240-512 8 Washington Zone 13 (Baltimore LATA) MD   238   2019-02-19   
240-512 9 Washington Zone 13 (Baltimore LATA) MD   238   2019-02-19   
240-518 2 Waldorf MD   236   2022-12-15   
240-518 3 Waldorf MD   236   2022-12-15   
240-518 4 Waldorf MD   236   2023-06-17   
240-518 7 Waldorf MD   236   2023-06-17   
240-525 2 Washington Zone 15 MD   236   2024-03-01   
240-525 4 Washington Zone 15 MD   236   2024-03-01   
240-525 6 Washington Zone 15 MD   236   2023-06-17   
240-526 3 Leonardtown MD   236   2021-03-04   
240-526 7 Leonardtown MD   236   2021-03-04   
240-531 1 Washington Zone 3 MD   236   2017-05-18   
240-533 4 Washington Zone 3 MD   236   2024-12-14   
240-534 1 Washington Zone 2 MD   236   2016-07-09   
240-536 7 Ashton MD   236   2025-09-28   
240-540 4 Washington Zone 13 (Baltimore LATA) MD   238   2020-04-30   
240-540 5 Washington Zone 13 (Baltimore LATA) MD   238   2020-04-30   
240-540 6 Washington Zone 13 (Baltimore LATA) MD   238   2021-03-04   
240-540 7 Washington Zone 13 (Baltimore LATA) MD   238   2020-06-11   
240-540 8 Washington Zone 13 (Baltimore LATA) MD   238   2020-06-11   
240-540 9 Washington Zone 13 (Baltimore LATA) MD   238   2020-06-11   
240-541 5 Washington Zone 2 MD   236   2012-10-16   
240-545 9 Washington Zone 15 MD   236   2025-05-10   
240-546 6 Washington Zone 16 MD   236   2015-06-27   
240-549 5 Frederick MD   240   2017-11-11   
240-549 6 Frederick MD   240   2017-11-11   
240-551 5 Washington Zone 10 MD   236   2016-04-28   
240-552 5 Washington Zone 10 MD   236   2016-04-28   
240-552 7 Washington Zone 10 MD   236   2011-04-12   
240-553 3 Washington Zone 13 MD   236   2022-12-22   
240-553 5 Washington Zone 13 MD   236   2022-12-22   
240-553 6 Washington Zone 13 MD   236   2022-11-08   
240-553 8 Washington Zone 13 MD   236   2011-04-23   
240-556 2 Washington Zone 14 MD   236   2008-10-05   
240-556 5 Washington Zone 14 MD   236   2016-03-14   
240-556 6 Washington Zone 14 MD   236   2015-06-27   
240-556 7 Washington Zone 14 MD   236   2016-03-14   
240-557 1 Washington Zone 6 MD   236   2017-07-13   
240-557 2 Washington Zone 6 MD   236   2018-01-14   
240-557 3 Washington Zone 6 MD   236   2018-01-14   
240-557 8 Washington Zone 6 MD   236   2020-04-30   
240-558 1 Washington Zone 11 MD   236   2008-10-05   
240-558 5 Washington Zone 11 MD   236   2012-10-07   
240-558 6 Washington Zone 11 MD   236   2015-07-30   
240-559 5 Ashton MD   236   2015-06-27   
240-563 A Washington Zone 5 MD VINNVACBDS0  236      
240-563 0 Washington Zone 5 MD   236   2017-08-19   
240-563 9 Washington Zone 5 MD   236   2019-05-17   
240-569 5 Flintstone MD   240   2020-01-06   
240-569 8 Flintstone MD   240   2020-01-06   
240-570 A Ashton (Baltimore LATA) MD BLTMMDCH42Z  238      
240-570 7 Ashton (Baltimore LATA) MD   238   2016-04-22   
240-570 8 Ashton (Baltimore LATA) MD   238   2016-04-22   
240-571 2 Laurel (Baltimore LATA) MD   238   2021-07-11   
240-571 3 Laurel (Baltimore LATA) MD   238   2021-07-11   
240-573 2 Washington Zone 15 MD   236   2012-04-05   
240-574 2 Friendsville MD   240   2023-02-24   
240-574 4 Friendsville MD   240   2021-04-02   
240-574 5 Friendsville MD   240   2021-04-02   
240-589 0 McCoole MD   240   2020-06-04   
240-589 5 McCoole MD   240   2020-01-06   
240-589 7 McCoole MD   240   2020-01-06   
240-590 5 Washington Zone 12 MD   236   2021-09-24   
240-591 3 Hagerstown MD   240   2022-10-16   
240-594 5 Bittinger MD   240   2020-06-04   
240-594 8 Bittinger MD   240   2019-04-04   
240-594 9 Bittinger MD   240   2019-04-04   
240-616 2 Washington Zone 13 MD   236   2017-07-12   
240-616 4 Washington Zone 13 MD   236   2012-10-07   
240-616 6 Washington Zone 13 MD   236   2021-02-18   
240-616 9 Washington Zone 13 MD   236   2024-05-03   
240-617 1 Highfield MD   240   2016-09-12   
240-617 2 Highfield MD   240   2016-09-12   
240-617 3 Highfield MD   240   2020-01-06   
240-617 4 Highfield MD   240   2020-01-06   
240-617 5 Highfield MD   240   2021-03-04   
240-618 2 Washington Zone 10 MD   236   2014-12-31   
240-618 3 Washington Zone 10 MD   236   2014-12-31   
240-621 4 Washington Zone 11 MD   236   2016-04-28   
240-621 5 Washington Zone 11 MD   236   2016-04-28   
240-622 3 La Plata MD   236   2021-07-12   
240-623 2 Washington Zone 4 MD   236   2015-05-15   
240-623 5 Washington Zone 4 MD   236   2015-07-30   
240-623 7 Washington Zone 4 MD   236   2015-06-27   
240-623 8 Washington Zone 4 MD   236   2016-01-04   
240-623 9 Washington Zone 4 MD   236   2016-01-04   
240-624 2 Washington Zone 13 MD   236   2008-10-05   

<< 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 >>

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.