Turbotax is asking me to add my Box 15 - State. I work and live in Tennessee. Which has no state income tax, therefore the state is not listed. What do I select?

Make sure Box 16 and Box 17 are also blank. 

Some people are reporting the state income in Box 16 for a state with no income tax. They should be leaving that box blank. 

If you are having a different issue, please continue and provide additional information if possible. 

Several  states do not have a state income tax.  So these states will not show up in certain drop down lists.   Leave boxes 15, 16, and 17 blank when you enter a W-2 for these states.

Alaska, Florida, Nevada, South Dakota, Tennessee, Texas, Washington and Wyoming