How to fill out the N-400 naturalization application form

Filling out the N-400 form is complicated. We always recommend that you get professional legal help to apply for citizenship. We understand that not everyone can get legal help. This page will help you complete the N-400 form if you do not have help.

top of page 1 of N400 form
Image courtesy of USCIS

Websites that can help you with the N-400 form

These websites belong to trusted organizations. They are organizations that exist to help immigrants, refugees, and asylum seekers.

Citizenshipworks helps you to fill out the form

Citizenshipworks is a free organization like USAHello. You can trust the website and the people who work there. The website will guide you through the application. If you have trouble with the application, Citizenshipworks will connect you to legal professionals near you who help immigrants.

The Immigrant Legal Resource Center website has the N-400 form translated in many languages

The Immigrant Legal Resource Center (ILRC) has translations  for the N-400 in Chinese, Spanish, Hindi, Korean, Arabic and other languages. Do not send these translated forms to the United States Citizenship and Immigration Services (USCIS). The translated forms are just to help you fill in the official form. Note: these translations do not show the latest (2019) version of the N400 form, but the questions are the same.

You can download a copy of the form with helpful notes

This copy of the N-400 has useful notes to help you fill in your own form. It was prepared by ILRC and the California Rural Legal Assistance Foundation. Do not send this version of the form to USCIS. The form with notes is just use help you fill in the official form. Note: these notes do not show the latest (2019) version of the N400 form, but the questions are the same.

Videos that can help you with the N-400 form

Here are two videos that will help you to fill in the form. Note: these videos may not show the latest (2019) version of the N400 form, but the questions are the same.

  • How to file online
    Click on the “CC” button and then the settings symbol to add subtitles in your language.
  • How to fill in the N-400 form
    This video is 1 ½ hours long! (It does not have subtitles but you can use the setting buttons to slow it down and make it easier to understand.)

Getting started on the N-400 form

The N-400 form is on the website of USCIS. Here is the official N-400 page in English and here is the official N-400 page in Spanish.

On this website you will also find:

  • instructions
  • a checklist and worksheet
  • information about requirements
  • information about fees

The USCIS suggests that you read A Guide to Naturalization (M-476) carefully before filing the form. USCIS says the Form N-400 instructions often refer to information in the guide, and it will help you.

Tips for filling in the N-400 form

  • Write clearly and neatly in black ink (if you are filling out the paper application).
  • Write or type your name exactly as it appears on your green card.
  • If you need to make lots of corrections, start again with a new form instead of crossing out or “whiting” out information.
  • Type or print your A-Number (the 7-to-9-digit alien registration number that is on your green card) at the top of every page. If the number has fewer than 9 digits, put enough zeros (0 or 00) to make a total of 9. For example, type or print number A1234567 as A001234567 or type or print number A12345678 as A012345678.
  • Answer all the questions. Don’t leave boxes blank unless the form say you can. Write or type “N/A,”  which means “not applicable,” or “None,” which means zero.
  • Always tell the truth on your form, and make sure your answer match any previous forms you filled out. If you are afraid to tell the truth about something on your form, please get advice from a lawyer first.
  • Sign  your application by hand and include all pages when you submit your form, even if they are blank.
  • Keep a copy of your application!

Understanding and answering questions about the N-400 form in your interview

During the citizenship interview, the interviewer will ask questions about the information on your N-400. They may ask you the meaning of the question.

If you are filling in your form or have filled in your form without really understanding the questions, you probably want to understand the N400 questions and difficult words on the form. Then you can answer any questions the interviewer asks you about the form.

The information on this page comes from USCIS and other trusted sources. It is intended for guidance and is updated as often as possible. USAHello does not give legal advice, nor are any of our materials intended to be taken as legal advice. If you are looking for a free or low-cost lawyer or legal help, we can help you find free and low-cost legal services.