You will need the following evidence and required documents to apply for Certificate of Citizenship:
Two identical passport-style photographs
Your birth certificate or birth record
Birth certificate or birth record of your US citizen parent
Marriage certificate(s) of your US citizen parent
Documents showing marriage termination (if applicable), such as certified divorce decree, death certificate, or annulment document
Proof of US citizenship such as birth certificate, Form N-550, Form N-560, Form FS-240, or valid US passport
Proof of required residence or physical presence in the US
Certain applicants may be required to provide the following:
Proof of status as US national (for applicants claiming US citizenship through a US national)
Proof of legitimation (for applicants born out of wedlock)
Proof of legal custody (for applicants whose US citizen parents divorced/separated and for adopted/legitimated applicants)
Copy of permanent resident card or other evidence of permanent resident status (for applicants claiming US citizenship after birth through a US citizen parent)
Copy of full, final adoption decree (for applicants who are adopted)
Re-adoption in the US
Evidence of all legal name changes