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You should probably go to a passport office. I'm fairly sure that copying a passport is illegal.
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It is not illegal, at least according to the United States Department of State, who actually suggests you make and keep a copy of your own passport.
http://www.state.gov/documents/organization/19795.pdf
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You can make a black and white copy of the identification page only. Making a color copy, especially actual size, is another matter entirely.
But back to the OP, the bigger question is, who is asking you for a certified copy of your passport, and what do they want it for?
You can get a certified copy of passport records from the State Department, but I doubt it's an actual copy of your passport.
I can't imagine that a notary, or anyone else, can certify a copy of a passport. They can notarize your signature, but what qualifies them to recognize a valid U.S. passport and make a certified copy?