Social Security Questions? Ask a Social Security Expert
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You will need to proof of citizenship and age (passport or birth certificate) as well as proof of marriage and divorce. Marriage certificate would be an obvious choice but if you have something else that state your date of marriage (any legal or court document) that would work as well.
You can still try and ask what else they would accept. Do you have any other government/state/church issued document that state dates of your marriage? Maybe social security still have some documents when you requested name change for instance. You had to have a marriage certificate to change your name on your social security card.