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.

NPA: 331 [Rate centres in NPA 331] [Dial plan for NPA 331]

NXX: 261

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
331-261 A Lemont IL ELGNILOTGT5  6529 T-MOBILE USA, INC. 358      
331-261 0 Lemont IL CHCGIL24XMD  495J STRATUS NETWORKS 358   2020-09-26   
331-261 1 Lemont IL CHCGIL24MMD  515J IP HORIZON LLC 358   2021-06-14   
331-261 3 Lemont IL ELGNILOTGT5  6529 T-MOBILE USA, INC. 358   2023-02-11   
331-261 4 Lemont IL CHCGIL24DS6  224C ONVOY, LLC 358   2021-07-04   
331-261 5 Lemont IL CHCGIL24DS6  224C ONVOY, LLC 358   2021-07-04   
331-261 6 Lemont IL CHCGIL24DS6  224C ONVOY, LLC 358   2021-07-04   
331-261 7 Lemont IL ELGNILOTGT5  6529 T-MOBILE USA, INC. 358   2023-02-11   
331-261 8 Lemont IL ELGNILOTGT5  6529 T-MOBILE USA, INC. 358   2019-08-19   
331-261 9 Lemont IL ELGNILOTGT5  6529 T-MOBILE USA, INC. 358   2019-08-19   

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.