A permanent resident is eligible for US citizenship 5 years after becoming a permanent resident, unless the individual is married to a US citizen, in which case the individual can apply 3 years after becoming a permanent resident.
Note: an individual who obtained permanent residency through employment or other means can still benefit from earlier eligibility if he/she is married to a US citizen, as long as he/she has been married to and living with a US citizen for 3 years at the time of filing (the US citizen spouse must also have been a US citizen during the requisite 3 year period).
Other general requirements include the following:
• Be at least 18 years old at the time of filing
• Show that you have lived for at least 3 months in the state or USCIS district where you apply.
• Demonstrate continuous residence in the United States for at least 5 years (or 3 years if married to a US citizen
immediately preceding the date of filing. Note that a trip abroad that lasts for 6 months or longer can break the
continuous residence requirement.
• Show that you have been physically present in the United States for at least 30 months out of the 5 years immediately
preceding the date of filing (pro-rated for spouses of US citizens).
• Be able to read, write, and speak basic English.
• Have a basic understanding of U.S. history and government (civics).
• Be a person of good moral character.
• Demonstrate an attachment to the principles and ideals of the U.S. Constitution.
The USCIS has additional information about eligibility for naturalization at www.uscis.gov
The naturalization process typically involves four steps: (1) filing Form N-400, (2) biometrics; (3) an interview at a USCIS Field Office that includes a civics and English test, and (4) an Oath Ceremony.