For your federal tax return, you can find the address to mail them to on the last page of the instructions to Form 1040. It will vary depending on what state you live in and whether you have a refund or tax due. You didn't say what state you are filing, so you will need to look that address up in the instructions from the department of revenue in the state you are filing for the tax return you are filing. You can do a search online for that.
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