U.S. Department of State
The mission of the Bureau of Consular Affairs (CA) is to protect the lives and interests of American citizens abroad and to strengthen the security of United States borders through the vigilant adjudication of visas and passports. CA contributes significantly to the USG goal of promoting international exchange and understanding. Our vision is to help American citizens engage the world. The Bureau issues the travel documents that allow Americans to travel the globe and lawful immigrants and visitors to travel to America and provides essential cycle of life services to American citizens overseas.

https://travel.state.gov/content/travel.html

 

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A Passport is Required for ALL International Travel

A passport is required for ALL international travel. If you're traveling anywhere overseas, even to Canada, the Caribbean or Mexico, you need a passport to board an international flight and to enter any country. In general, your passport must be valid for at least six months after the date you enter a foreign country.

Visit the U. S. State Department's website if you need a new passport or your passport is about to expire.  There, you can find information on obtaining first time passports, passport renewals, second passport issuance and extra blank pages for an existing passport.  You can also visit the U. S. Postal Service to find the closest Post Office that can also provide new and renewal passport services.