I want to get marry in a court housewhat is required by law

It depends on what state you are in...

Generally you need a spouse and to apply for a marriage license. When you go to apply for the marriage license they'll tell you what paperwork you need to provide and how to file it and what procedures you need to go through.

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Go to your nearest courthouse or give them a call to inquire about the fees and requirements. You can contact your city hall for information as well.