N-400: Application for Naturalization (U.S. Citizenship)
Used to apply for U.S. citizenship through the naturalization process.
90 minutes
to complete
$710
filing fee
5 fields
to fill out
What Each Field Means
Current Legal Name
Your full legal name.
Tip: As shown on your permanent resident card (green card).
Basis for Eligibility
Why you are eligible for naturalization.
Tip: Most people apply after 5 years as a permanent resident, or 3 years if married to a U.S. citizen.
Green Card Number
Your permanent resident card number.
Tip: Found on the front of your green card. It is a 13-digit number.
Total Days Outside the U.S.
Total number of days you were outside the United States in the last 5 years.
Tip: Add up all days spent outside the U.S. Trips over 6 months may break continuous residence.
Marital Status
Your current marital status.
Tip: Must provide details about current and all previous marriages.
Common Mistakes to Avoid
Name doesn't match green card exactly
Applying before meeting residency requirement
Wrong eligibility category
Confusing with A-Number
Card has expired
Underestimating days outside U.S.
Not counting short trips
Not disclosing previous marriages
Wrong divorce date
Ready to complete N-400?
Let our AI assistant guide you through every step.