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: STLSMO23RPA

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
314-253 A Ladue MO 9533 SOUTHWESTERN BELL 520      
314-423 A Ladue MO 9533 SOUTHWESTERN BELL 520      
314-426 A Ladue MO 9533 SOUTHWESTERN BELL 520      
314-427 A Ladue MO 9533 SOUTHWESTERN BELL 520      
314-428 A Ladue MO 9533 SOUTHWESTERN BELL 520      
314-428 0 Ladue MO 9533 SOUTHWESTERN BELL 520      
314-428 1 Ladue MO 9533 SOUTHWESTERN BELL 520      
314-428 2 Ladue MO 9533 SOUTHWESTERN BELL 520      
314-428 3 Ladue MO 9533 SOUTHWESTERN BELL 520      
314-428 4 Ladue MO 9533 SOUTHWESTERN BELL 520      
314-428 5 Ladue MO 9533 SOUTHWESTERN BELL 520      
314-428 6 Ladue MO 9533 SOUTHWESTERN BELL 520      
314-428 7 Ladue MO 9533 SOUTHWESTERN BELL 520      
314-428 8 Ladue MO 9533 SOUTHWESTERN BELL 520      
314-429 A Ladue MO 9533 SOUTHWESTERN BELL 520      
314-538 A Ladue MO 9533 SOUTHWESTERN BELL 520      
314-733 A Ladue MO 9533 SOUTHWESTERN BELL 520      
314-733 0 Ladue MO 9533 SOUTHWESTERN BELL 520      
314-733 1 Ladue MO 9533 SOUTHWESTERN BELL 520      
314-733 2 Ladue MO 9533 SOUTHWESTERN BELL 520      
314-733 3 Ladue MO 9533 SOUTHWESTERN BELL 520      
314-733 6 Ladue MO 9533 SOUTHWESTERN BELL 520      
314-733 7 Ladue MO 9533 SOUTHWESTERN BELL 520      
314-733 8 Ladue MO 9533 SOUTHWESTERN BELL 520      
314-890 A Ladue MO 9533 SOUTHWESTERN BELL 520      

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

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