Are you still a resident of Alabama?
If not, what state do you reside in currently, and do you have a driver's license from your current state of residence?
Here's a link to the page you need to obtain a duplicate Social Security card. Unfortunately, if you still reside in Alabama, you can't obtain a duplicate online, as the system for Alabama driver's licenses is not co-ordinated with the SSA systems.
You will need to scroll down to the second section of the page & follow the directions to obtain a duplicate card.
You will have to visit your local Social Security office. Here's another link where, using your ZipCode you can find the address and local telephone number of the closest local Social Security office.
Let me know if I can assist you further.
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Thanks very much,