When you sign onto to your online account using the exact same user ID you used to create, complete and file the 2016 tax return you will land on the Welcome Home screen. Click on My TurboTax at the top left of the program screen. This will take you to the 2016 Timeline. Under the section Some things you can do: Click on Download all forms and worksheets.
When viewing the PDF the state tax return will be located directly below the forms, schedules and worksheets of the federal tax return.