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 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 >>

NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
667-236 9 Perryville MD   238   2019-02-19   
667-238 3 Preston MD   242   2021-03-05   
667-238 5 Preston MD   242   2023-02-12   
667-238 8 Preston MD   242   2019-03-04   
667-238 9 Preston MD   242   2019-03-04   
667-239 1 Baltimore MD   238   2015-07-27   
667-239 2 Baltimore MD   238   2015-07-27   
667-239 4 Baltimore MD   238   2015-07-27   
667-239 5 Baltimore MD   238   2015-07-27   
667-239 6 Baltimore MD   238   2015-07-27   
667-239 7 Baltimore MD   238   2015-07-27   
667-239 8 Baltimore MD   238   2014-10-06   
667-239 9 Baltimore MD   238   2014-10-06   
667-240 8 Columbia MD   238   2018-05-27   
667-241 4 Ridgely MD   242   2021-03-05   
667-241 8 Ridgely MD   242   2019-03-10   
667-241 9 Ridgely MD   242   2019-03-10   
667-242 8 Rock Hall MD   242   2019-02-26   
667-242 9 Rock Hall MD   242   2019-02-26   
667-243 2 Oxford MD   242   2018-09-13   
667-243 8 Oxford MD   242   2019-03-04   
667-243 9 Oxford MD   242   2019-03-04   
667-244 3 Still Pond MD   242   2018-09-13   
667-244 8 Still Pond MD   242   2019-03-04   
667-244 9 Still Pond MD   242   2019-03-04   
667-245 8 Cecilton MD   242   2019-03-04   
667-245 9 Cecilton MD   242   2019-03-04   
667-247 8 Chesapeake City MD   242   2019-03-04   
667-247 9 Chesapeake City MD   242   2019-03-04   
667-248 8 Denton MD   242   2019-03-04   
667-248 9 Denton MD   242   2019-03-04   
667-249 3 Galena MD   242   2021-04-29   
667-249 7 Galena MD   242   2019-03-04   
667-249 9 Galena MD   242   2019-03-04   
667-253 2 Salisbury MD   242   2017-12-18   
667-253 3 Salisbury MD   242   2017-12-18   
667-254 0 Chestertown MD   242   2024-05-23   
667-254 8 Chestertown MD   242   2019-03-04   
667-254 9 Chestertown MD   242   2019-03-04   
667-255 A Hillsboro MD SLBRMDSBXVX  242      
667-255 0 Hillsboro MD   242   2018-10-13   
667-255 1 Hillsboro MD   242   2019-03-04   
667-255 2 Hillsboro MD   242   2019-03-04   
667-255 8 Hillsboro MD   242   2021-04-29   
667-256 8 Aberdeen MD   236   2019-02-19   
667-256 9 Aberdeen MD   236   2019-02-19   
667-257 5 Columbia MD   238   2022-10-16   
667-260 A Baltimore MD BLTMMDCH42Z  238      
667-260 0 Baltimore MD   238   2025-01-06   
667-260 1 Baltimore MD   238   2025-01-06   

<< 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 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 >>

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.