You can apply for U.S. citizenship through naturalization if you hold a green card and meet specific age, residency, and character requirements. Naturalization is the formal process that grants citizenship to eligible foreign-born residents.
USCIS requires you to be at least 18 years old and to hold permanent resident status for a set period—usually five years with continuous U.S. residence, though this shortens to three years if you're married to a U.S. citizen or to one year if you serve in the military.
Official resources:
- Apply for Naturalization — Use this page to review requirements and apply directly.
- I am a Lawful Permanent Resident of 5 Years — Use this page to check the study’s participation requirements.
Table of Contents
- Who Qualifies: The Core Requirements
- Residency Timelines: How Long You Must Wait
- Language, Civics, and Character Tests
- Barriers to Naturalization
- Frequently Asked Questions
Who Qualifies: The Core Requirements
The foundation of eligibility is permanent resident status itself. You cannot apply for naturalization as a tourist, temporary visa holder, or undocumented immigrant; only lawful permanent residents (green card holders) can file.
Age 18 is the minimum, meaning you cannot file before reaching adulthood. Some minors can become citizens through a parent's naturalization, but the standard application path requires you to be an adult when you file.
Residency Timelines: How Long You Must Wait
The primary pathway requires five years as a lawful permanent resident with continuous U.S. residence. Continuous residence means you cannot take trips or moves that abandon your permanent resident status, even if you keep your green card physically. Within that five-year window, you must have been physically present in the U.S. for at least 30 months.
This is stricter than continuous residence alone. If you spend extended time abroad, you may lose eligibility even if you technically maintained your permanent resident status on paper. Two accelerated paths exist for eligible applicants. If you're married to a U.S. citizen and hold permanent resident status, you can qualify after three years.
Lawful permanent residents who serve at least one year in the U.S. Armed Forces can naturalize after that single year, bypassing the civilian timeline entirely. All applicants must live in the state or USCIS district where they file for at least three months. If you move states, wait three months before filing in your new location.
Language, Civics, and Character Tests
You must demonstrate good moral character and pass an English language test covering speaking, reading, writing, and understanding. The USCIS officer administering your interview assesses your English abilities during your naturalization appointment. The civics test covers U.S. history and government. applicants aged 65 or older with at least 20 years of permanent residence may waive the English test; those over 55 with 15 or more years of permanent residence may take the civics test in their native language with an interpreter.
Good moral character is evaluated based on your record, particularly any criminal history, fraud, or dishonesty. A single minor violation does not automatically disqualify you, but serious crimes create permanent bars to naturalization.
Barriers to Naturalization
Permanent residents with criminal convictions or security concerns may be permanently barred from naturalization. Felonies, crimes of moral turpitude, and drug-related offenses are among the most common disqualifying crimes, though not every conviction is automatically barring—an immigration attorney can assess your specific situation. Permanent residents who have abandoned their status through extended foreign residency or who have been deported cannot file for naturalization. Once you lose permanent resident status, you must reapply for permanent residence before you can pursue citizenship.
Frequently Asked Questions
What if I'm married to a U.S. citizen now, but we might divorce before I file?
The three-year pathway requires you to still be married to a U.S. citizen when you file your N-400 application. If you divorce before filing, you'll instead need to meet the five-year civilian residency requirement.
I travel frequently for work outside the U.S. How much time abroad is too much?
You must be physically present in the U.S. for at least 30 months during your five-year residency period. Any absences totaling more than 2.5 years during that window will disqualify you from naturalization eligibility.