Where do I find my citizenship number?

It is often necessary to search for your citizenship number. For example, when you need to send any form to US Citizenship and Immigration Services (USCIS) or to write a petition about your relative who lives abroad, you will have to include your citizenship number in the application form. And you can find the citizenship number, also known as the C-File number, on three possible papers.

Once you become a US naturalized citizen, USCIS will hand you the Certificate of Naturalization. On this certificate, you will find the citizenship number you need.

The certificate contains a lot of data, including your A-number (the USCIS registration number or Alien number), full name, signature, marital status, issue date, your residence, and even the country of your previous nationality.

That is a lot of information, but you may confuse you citizenship number only with the USCIS registration number. Both these numbers are located in the top right corner of your certificate, but the citizenship number always goes first. In other words, you will see your citizenship number on the very top of the certificate. The citizenship number is printed with red ink and consists of six or more digits.

Sometimes the USCIS office issues a new form of certificate to improve its security and design, but the citizenship number will always be located at the very top of the certificate.

Besides your Certificate of Naturalization, the citizenship number can be located on a court naturalization record. If you filed a petition to a court, the court indice will also include the C-File number.

At last, the C-File number can be found on a Certificate of Citizenship. In case you were born by American parents outside the US, you will get such a certificate with your citizenship number.

You should be very careful when looking for your citizenship number. The citizenship number is different from a petition number or USCIS registration number. You can follow these two rules when searching for a C-File number:

  • The citizenship number is always red and is located on the very top of your Certificate of Naturalization or Certificate of Citizenship.
  • If you have some other document such as a court record, then look for a number with the letters CN (Citizenship Number) that are printed before the digits.

That should be enough information for you to find your citizenship number and to correctly fill in any application forms.

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