Hello, my name is ***** ***** I will be the immigration attorney helping you today.
Unfortunately if you were legally married in another country and never divorced, then that marriage is considered legal still in the US and you must disclose it on the N-400. Even though it happened in another country, you do not want to like about it and not include it because if USCIS ever found out, it would be considered that you were lying if you do not mention it on the application. Just put whatever information you do know about your husband. Whatever you don't know, you can write "don't know" or "don't remember."
For your information, if later you would like to divorce your husband, you can do so without knowing where your husband is. You need to get a divorce family attorney to help you with it but it can definitely be done and it will be legal even if you can't find him.
Good luck to you during this process and I hope this answer has helped you!
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