Can I travel back into the U.S. if I lost my green card?

You may have a difficult time returning to the U.S. if you travel outside of the country with an expired green card. You can make an appointment at a local USCIS office in your area to request an extension. CITATION: https://help.cbp.gov/app/answers/detail/a_id/75/~/lpr--lost,-stolen-or-expired-green-cards-or-has-no-expiration-date; Page 98, http://www.uscis.gov/sites/default/files/USCIS/About%20Us/Electronic%20Reading%20Room/Customer%20Service%20Reference%20Guide/Permanent-Residents4-3.pdf