Replacing a Lost or Stolen Passport
Like all documents, US passports sometimes get lost or stolen. Due to the importance of this particular document, you should report the theft or loss immediately.
If the loss or theft happens while you're in the U.S., call (877) 487-2778. Or, promptly complete Form DS-64: Statement Regarding a Lost or Stolen Passport.
Just so you know, once you've reported a missing or stolen passport, it's automatically canceled. Even if you find it later, it can't be validated. If you do come across it, though, send it to the address listed above.
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Unfortunately, to replace your US passport, you'll need to apply for a brand new one by completing Form DS-11: Application for a U.S. Passport and Form DS-64: Statement Regarding a Lost or Stolen Passport, and taking them to a local acceptance agency or a regional passport agency.