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: PCFCMO61RS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
636-257 A Pacific MO 9533 SOUTHWESTERN BELL 520      
636-257 1 Pacific MO 9533 SOUTHWESTERN BELL 520      
636-257 2 Pacific MO 9533 SOUTHWESTERN BELL 520      
636-257 3 Pacific MO 9533 SOUTHWESTERN BELL 520      
636-257 4 Pacific MO 9533 SOUTHWESTERN BELL 520      
636-257 5 Pacific MO 9533 SOUTHWESTERN BELL 520      
636-257 6 Pacific MO 9533 SOUTHWESTERN BELL 520      
636-257 8 Pacific MO 9533 SOUTHWESTERN BELL 520      
636-257 9 Pacific MO 9533 SOUTHWESTERN BELL 520      
636-271 A Pacific MCA5 MO 9533 SOUTHWESTERN BELL 520      
636-271 0 Pacific MCA5 MO 9533 SOUTHWESTERN BELL 520      
636-271 1 Pacific MCA5 MO 9533 SOUTHWESTERN BELL 520      
636-271 2 Pacific MCA5 MO 9533 SOUTHWESTERN BELL 520      
636-271 3 Pacific MCA5 MO 9533 SOUTHWESTERN BELL 520      
636-271 6 Pacific MCA5 MO 9533 SOUTHWESTERN BELL 520      
636-271 7 Pacific MCA5 MO 9533 SOUTHWESTERN BELL 520      
636-271 8 Pacific MCA5 MO 9533 SOUTHWESTERN BELL 520      
636-271 9 Pacific MCA5 MO 9533 SOUTHWESTERN BELL 520      

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

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