3 thoughts on “And the lowest ZIP code is…

  1. Ketchikan has the highest ZIP code assigned by the United States Postal Service: 99950. ZIP Code 99999 is not reserved anywhere.

  2. As I was searching for the lowest ZIP code value, I found 00501 is a “Unique” zip code (meaning it’s used for a specific company or organization) used for the IRS Service Center in Holtsville, NY. You can check it by going to http://zip4.usps.com/zip4/citytown_zip.jsp
    and entering 00501. There may be other lower ones, but nothing lower that I’ve tried has worked.

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