- an immediate relative of a U.S. citizen, this includes spouses, unmarried children under the age of 21, and parents of U.S. citizen petitioners 21 or older
- a family member of a U.S. citizen fitting into a preference category, this includes unmarried sons or daughters over the age of 21, married children of any age, and brothers and sisters of U.S. citizen petitioners 21 or older
- a family member of a green card holder, this includes spouses and unmarried children of the sponsoring green card holder
- a member of a special category, this can include battered spouse or child (VAWA), a K nonimmigrant, a person born to a foreign diplomat in the United States, a V nonimmigrant or a widow(er) of a U.S. Citizen
Obtaining Permanent Residency Through Marriage to a US Citizen
A foreign national who has married a U.S. citizen is generally entitled to apply for permanent residency. This process is known as "adjustment of status," and it requires the cooperation of both the U.S. citizen as well as the foreign national spouse.
The first step in the adjustment of status process is to determine if you fit into a specific immigrant category . Most immigrants become eligible for a green card (permanent residence) through a petition filed on your behalf by a family member or employer.
Procedure is here.