You may be eligible for naturalization if you meet following criteria: 

• Are at least 18 years old.
• Have been a lawful permanent resident (i.e. green card holder) for at least 5 years (3 years if married to a United States citizen). Keep in mind you are allowed to file your naturalization application up to 3 months before your fifth anniversary (third anniversary if married to a U.S. citizen).
• Have lived in your current state of residence for at least the past 3 months.
• Have continuously resided in the United States as a lawful permanent resident (i.e. green card holder) for at least 5 years (3 years if married to a United States citizen). This typically means you have no absences from the U.S. of 6 months or more during the past 5 years (3 years if married to a U.S. citizen).
• Have been physically present in the United States for at least 30 months during the past 5 years (18 months during the past 3 years if married to a United States citizen).
• Have been a person of good moral character for at least five years before filing for naturalization (3 years if married to a United States citizen). Keep in mind you don’t need to be a saint to establish you are “a person of good moral character.” You may still be eligible for naturalization if you previously had run-ins with police.
• Have been loyal to the principles of the U.S. Constitution.
• With some exceptions, you must be able to read, write, and speak English and show knowledge of United States history and our system of government.