Renew US passport

You can go to following site for US passport renewal.
US Passport renewal for adults

Renewal for Minor (under 16 years)
Minor passport renewal details

US Passport fees:
US Passport fees

Locations to process the application:
[1] If you are applying first time go to nearest post office (check out which one process passport application.. mostly main post office in your area)

Checkout Passport following link for other locations
Passport Acceptance Facility Search Page

[2] If you are in hurry go to nearest passport agencies (take appointment)
Passport Agencies in US cities