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.

Switch: WSFRMADERP0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
978-392 A Westford MA 9102 VERIZON NEW ENGLAND INC. 128      
978-399 A Westford MA 9102 VERIZON NEW ENGLAND INC. 128      
978-399 0 Westford MA 9102 VERIZON NEW ENGLAND INC. 128      
978-399 2 Westford MA 9102 VERIZON NEW ENGLAND INC. 128      
978-589 A Westford MA 9102 VERIZON NEW ENGLAND INC. 128      
978-589 0 Westford MA 9102 VERIZON NEW ENGLAND INC. 128      
978-589 1 Westford MA 9102 VERIZON NEW ENGLAND INC. 128      
978-589 3 Westford MA 9102 VERIZON NEW ENGLAND INC. 128      
978-589 4 Westford MA 9102 VERIZON NEW ENGLAND INC. 128      
978-589 5 Westford MA 9102 VERIZON NEW ENGLAND INC. 128      
978-589 6 Westford MA 9102 VERIZON NEW ENGLAND INC. 128      
978-589 8 Westford MA 9102 VERIZON NEW ENGLAND INC. 128      
978-589 9 Westford MA 9102 VERIZON NEW ENGLAND INC. 128      
978-692 A Westford MA 9102 VERIZON NEW ENGLAND INC. 128      

Last updated: Sat, 10 Oct 2026 15:24:20 UTC

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