Those eligible for U.S. green cards include family members of U.S. citizens, people with certain professional skill sets, refugees and asylum seekers, according to U.S. Citizenship and Immigration Services. Additionally, people eligible for certain other immigrant categories can apply for a green card.
There is no limit to the number of immediate relatives who may apply for a green card, notes Citizenship and Immigration Services. This includes spouses, parents and children under 21 of a US citizen. Children over 21 and siblings of U.S. citizens may also apply for a green card, but they are given lower priority.
Workers with advanced degrees, professors, executives and others with exceptional abilities are also eligible for green cards, according to Citizenship and Immigration Services. Green cards are also available to qualifying spouses and children of refugees.