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BYU in Idaho has a database of western states marriage indexes from various states. You can access the database here. The list isn’t all inclusive but they are working on adding more records. If you suspect you had relatives that married in Idaho, you should search this database. The site also allows you to add records to the database.
While you are there, if you have relatives that lived in Idaho, you can search their state death index that spans from 1911 to 1956.
Happy searching!