Did he skip town after you were born or is he dead now and you simply can’t ask him or any surviving relatives? That is a good question actually. Plenty of people don’t even know their parents much less where they were born. I am not sure how you would note “Unknown” or if you can simply take a best guess.
I suppose I could try to poke around and see if anyone’s done the geneology thing on my ancestors. Plan B might be to try searching on Zabasearch, but that could be even more tedious than geneology, and I don’t even know if he’s still alive or not. Once I find likely matches, then what? Mail out postcards saying “You might be my father. If you recognize my name, please tell me where you were born.”?
I’m sure the Dept of State has a procedure for this, but I’d like to know what it is before I fill out forms and wait in line.
Just write “unknown.” It’s not like the State Department hasn’t seen passport apps from children of single parents before. As long as your proof of citizenship and identity is in order and you don’t appear in any databases of evil terrorist masterminds, it’s extremely unlikely that you’ll be denied a passport.
Thanks to the magic known as gethuman.com, I was able to speak with someone and get the answer.
For future reference, they’d prefer you provide the city and state, if known, or just the state. If you don’t know, “unknown” is a valid and acceptable answer.