According to the on-line ZIP code file I found, there are four "first three digits" ZIP codes that map to more than one state. 

{
  63  => { CT => 39, NY => 1 },
  205 => { DC => 49, VA => 1 },
  739 => { OK => 14, TX => 1 },
  834 => { ID => 44, WY => 1 },
}

[download]

UPDATE: I got the zip codes file from 

https://www.downloadexcelfiles.com/sites/default/files/docs/usazipcode
+-1512j.csv

[download]

In reply to Re^2: Multiple file handles by tybalt89
in thread Multiple file handles by MoodyDreams999

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