US Citizenship and Social Security Administration

SSA you have to inform about every your immigration status change, but it's because UC Citizens get 20% more of retirement pansion than US residents, so that's the benefit to new US citizens to update a status at SSA.

You must notify your employer with I-9 form.

You don't have to inform DMV, because they already verified your identity, but they can always ask for your documents.

Banks, insurers you can update doc's #, because sometimes banks keep your green card # on the files and check that when they ask to see your ID.
 
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