Can a husband and wife with green card over five years file for citizenship on one n 400 form?

No, husband and wife must apply on separate N-400 Form, each with their own filing fee.

Hi, You need to prepare and submit separate applications and will be interviewed separately although you may be interviewed on the same day.

Everything should be filed separately, N-400 Form is meant for only one person.

You will need to each apply separately for naturalization and you will both have separate interviews. Good luck!

You and your husband will need to file separate naturalization applications. You will also be interviewed separately. You may request that the two of you be interviewed on the same day, and sworn in on the same day and at same place, if applications are approved, but these decisions are discretionary. You may want to consider retaining an immigration attorney to help you with the process and application, and during the interview.