Can I cross back and forth into the US while my US passport is being?
This depends on what cross means. You can cross the US-Canada and US-Mexico border (and visit most islands in the Caribbean), by land and sea, with: US Passport Books US Passport Cards Enhanced Drivers License (in MI, MN, NY, VT, WA, or in Canada: BC, MB, ON) Trusted Traveler Card (Global Entry, NEXUS, SENTRI) You can only cross by airplane into Canada or Mexico (or any other country) using a US Passport Book. If you sent in your only Passport item, then youll have to wait until you get it back, pay for expedited passport renewal service, or get one of the other items. People who cross the border very frequently will often space a Passport Book and Card a few years apart, so they always have a valid item to cross with on them.