The passport card is a slimmer, less expensive alternative to using a traditional passport (now called a passport book). It is perfect for travelers who cross land borders frequently between the U.S., Mexico, Canada, Bermuda and the Caribbean and is about the size of a driver's license. The passport card is not designed for air travel.
The passport card costs $45 for first time adult applicants who have never had a passport book and $35 for first time children. If you already have a passport book, the cost is $20.
No. The card is only for land and sea crossings.
Yes. Other documents are also accepted, like a SENTRI pass.
The passport card is valid for 10 years for adults, like a passport book. Children's passport cards are valid for 5 years if they are 15 years or younger.
Applications may be obtained from post offices and other service providers. You may search for an office near you at the U.S. Department of State's website by using their Passport Acceptance Facility Search Page.
US citizens may be required to have a passport or other accepted document if they want to take a road trip into Mexico. This is all part of a new set of rules laid out by the US Departments of State and Homeland Security that will affect every US citizen entering the United States from countries within the Western Hemisphere (e.g. the Caribbean, Bermuda, Central & South America, Mexico and Canada). Read more...
Source: U.S. Department of State. Visit their website for more information about the passport card.