Fill out the passport by mail application (Form DS-82). This can be found on the U.S. Department of State website. Gather all documentation required, including your previous passport book, a current passport photo, documentation of name change, if applicable, and fees for your passport. As of March, 2011, the renewal fee is $110 and an additional $60 if you want your passport within two to three weeks with expedited service.
Place all of your documents and application into a padded, weatherproof mailing envelope. All paperwork should fit into the envelope without being folded. The U.S. Department of State recommends using a Tyvek envelope or one similar.
Seal the envelope and address it with the mailing address that is listed on Form DS-82. If you are choosing expedited service, you must clearly write "EXPEDITE" on the outside of the envelope.
Mail your package at your local post office. It is recommended that you add delivery confirmation so that your package can be tracked.