If you were born in the U.S. and there is no birth record on file, you will need several
different documents to substantiate your citizenship. You will need:
A letter of no record issued from the Vital Statistics office of the state of your
birth with your name and what years were searched for your birth record.
Early public records to prove your birth in the U.S.
If you were born outside the U.S. and your U.S. parent(s) did not register your birth
at the U.S. embassy or consulate, you may apply for a U.S. passport. You will need:
Your foreign birth certificate showing both of your parents' names
Evidence of your parent(s) U.S. citizenship and
Your parents' marriage certificate