Yes, you can file by mail your 2016 state income tax return even though you already filed your 2017 income tax return.
You'll need to purchase the CD\Download version, either for Windows or Mac. Install it on your computer, enter the federal information and then you'll be able to generate your state income tax return. Once you're done entering your information, simply print, sign and mail in your returns using the instructions on the information pages.
Related information: How do I prepare a 2015 or prior year income tax return?
[Edited 3-17-2020|5:33 am PST]
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