comment on

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]

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