What is the fastest way to obtain a US Passport?

There are several expediting services that can facilitate a new passport in 2 days. The absolute fastest way is to go directly to a US Passport Agency operated by the State Department in many large US cities. I got a passport renewed in 4 hours. You will need a travel itinerary that proves you are traveling within the next couple of days. It cost me $160 versus the roughly $500 I was quoted by the commercial businesses offering 24 hour turn around which really was 48 hour turn around.

The link below shows locations.

You schedule the appointment over the phone. I was very impressed with the speed the govt issued the new passport.