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I can't recommend needing a passport in less than a week, but if you do anyway, American Passport Express got me one in two days. After seeing them high in Google results, I found they were the accepted answers in this Ask MeFi thread, and went with them. I spent most of Monday assembling the full application, getting it certified by an acceptance agent, and fedexing it to them overnight, and I had a passport by 11 AM Wednesday.