Comments by "Beth Hentges" (@bethhentges) on "Zip Codes: A History" video.

  1.  @oldsguy354  Hello, Central? Pennsylvania 6500 please.
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  2. 5+4=9 Then two more digits added makes 11. The twelfth digit is a check-digit.
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  3. About 15 yrs ago, Guatemala changed from 10-digit phone numbers like ours, 502-xxx-xxxx to 11-digit numbers 502-xxxx-xxxx rather than add area codes.
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