How tall and wide is the United States Postal Service "quiet zone" that is to be left blank, below the address, on a machinable mail piece?

Answer 1

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5/8 inch from bottom.

You didn't specify whether this is a postcard, letter, manilla envelope...there are lots of kinds of machinable mail each with different requirements.

https://pe.usps.com/text/dmm300/202.htm#ep1082784