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.

OCN: 9212 VERIZON MARYLAND, INC.

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NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
301-629 0 Washington Zone 14 (Baltimore LATA) MD CLMAMDCBDS0  238      
301-629 2 Washington Zone 14 (Baltimore LATA) MD CLMAMDCBDS0  238      
301-630 A Washington Zone 6 MD TMHLMDTHDS0  236      
301-631 A Frederick MD FRDRMDFRDS1  240      
301-631 0 Frederick MD FRDRMDFRDS1  240      
301-631 1 Frederick MD FRDRMDFRDS1  240      
301-631 2 Frederick MD FRDRMDFRDS1  240      
301-631 3 Frederick MD FRDRMDFRDS1  240      
301-631 5 Frederick MD FRDRMDFRDS1  240      
301-631 6 Frederick MD FRDRMDFRDS1  240      
301-631 7 Frederick MD FRDRMDFRDS1  240      
301-631 8 Frederick MD FRDRMDFRDS1  240      
301-631 9 Frederick MD FRDRMDFRDS1  240      
301-632 A Waldorf MD WDRFMDWDDS0  236      
301-632 2 Waldorf MD WDRFMDWDDS0  236      
301-632 3 Waldorf MD WDRFMDWDDS0  236      
301-632 4 Waldorf MD WDRFMDWDDS0  236      
301-632 5 Waldorf MD WDRFMDWDDS0  236      
301-632 6 Waldorf MD WDRFMDWDDS0  236      
301-632 7 Waldorf MD WDRFMDWDDS0  236      
301-632 8 Waldorf MD WDRFMDWDDS0  236      
301-632 9 Waldorf MD WDRFMDWDDS0  236      
301-636 A Washington Zone 5 MD LDVRMDLODS0  236      
301-636 1 Washington Zone 5 MD LDVRMDLODS0  236      
301-636 2 Washington Zone 5 MD LDVRMDLODS0  236      
301-636 6 Washington Zone 5 MD LDVRMDLODS0  236      
301-636 8 Washington Zone 5 MD LDVRMDLODS0  236      
301-636 9 Washington Zone 5 MD LDVRMDLODS0  236      
301-638 A Waldorf MD WDRFMDWDDS0  236      
301-638 0 Waldorf MD WDRFMDWDDS0  236      
301-638 1 Waldorf MD WDRFMDWDDS0  236      
301-638 2 Waldorf MD WDRFMDWDDS0  236      
301-638 3 Waldorf MD WDRFMDWDDS0  236      
301-638 4 Waldorf MD WDRFMDWDDS0  236      
301-638 5 Waldorf MD WDRFMDWDDS0  236      
301-638 7 Waldorf MD WDRFMDWDDS0  236      
301-638 9 Waldorf MD WDRFMDWDDS0  236      
301-640 A Washington Zone 10 MD GTBGMDGBPS0  236      
301-640 2 Washington Zone 10 MD GTBGMDGBPS0  236      
301-640 3 Washington Zone 10 MD GTBGMDGBPS0  236      
301-640 4 Washington Zone 10 MD GTBGMDGBPS0  236      
301-640 7 Washington Zone 10 MD GTBGMDGBPS0  236      
301-644 A Frederick MD FRDRMDFRDS1  240      
301-644 1 Frederick MD FRDRMDFRDS1  240      
301-644 2 Frederick MD FRDRMDFRDS1  240      
301-644 3 Frederick MD FRDRMDFRDS1  240      
301-644 4 Frederick MD FRDRMDFRDS1  240      
301-644 5 Frederick MD FRDRMDFRDS1  240      
301-644 6 Frederick MD FRDRMDFRDS1  240      
301-644 7 Frederick MD FRDRMDFRDS1  240      

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Last updated: Sun, 07 Feb 2021 01:52:50 UTC

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