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: 631 [Rate centres in NPA 631] [Dial plan for NPA 631]

NXX: 361

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
631-361 A Smithtown NY SMTWNYSMDS0  9104 VERIZON NEW YORK, INC. 132      
631-361 0 Smithtown NY   6622 OMNIPOINT COMMUNICATIONS, INC. - NY 132   2020-02-05   
631-361 1 Smithtown NY   6622 OMNIPOINT COMMUNICATIONS, INC. - NY 132   2020-04-09   
631-361 2 Smithtown NY   9104 VERIZON NEW YORK, INC. 132      
631-361 3 Smithtown NY   9104 VERIZON NEW YORK, INC. 132      
631-361 4 Smithtown NY   9104 VERIZON NEW YORK, INC. 132      
631-361 5 Smithtown NY   9104 VERIZON NEW YORK, INC. 132      
631-361 6 Smithtown NY   9104 VERIZON NEW YORK, INC. 132      
631-361 7 Smithtown NY   9104 VERIZON NEW YORK, INC. 132      
631-361 8 Smithtown NY   9104 VERIZON NEW YORK, INC. 132      
631-361 9 Smithtown NY   9104 VERIZON NEW YORK, INC. 132      

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

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.