Also known as a Permanent Resident Card, Form I-551, or alien registration card.  USCIS issues Green Cards to aliens as evidence of their lawful permanent resident status in the United States.  For Form I-9, it is acceptable as proof of identity and employment authorization.  Although some Green Cards do not have an expiration date, most are valid for 10 years.  Cards issued to individuals with conditional permanent resident status are valid for two years.

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