What percentage of first class mail is lost?

A very small fraction of one percent. Of this most is not actually lost, but is either damaged by or becomes trapped in the massive automated machinery used to process the mail. Letter mail gets processed on multiple automated machines, usually before anyone actually even looks at it.



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So the USPS moves about 146 BILLION PIESES OF MAIL EVERY YEAR, and about 3% of that mail is lost. The loss of mail is usually because the package was missing a proper zip code or the return address was not ledge-able so the letter/package could not be returned to sender.

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USPS® Mail Search When we receive your Missing Mail search request, we will send you a confirmation email. We will also send you periodic updates about the search. If we find your package or mail, we will send it to the address you provided.

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One of the biggest differences between the two services is that First Class mail doesn't have a default insurance policy like Priority Mail. So, in cases where a package is lost or damaged during delivery via First Class, the sender isn't covered.

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