OR STT is Oregon Transit Tax
Normally the amount of the tax is reported in Box 14, not your total wages.
There is a drop-down list for Box 14 and Oregon Statewide Transit Tax is an option, however entering the entire amount of your wages in box 14 for that tax would cause an issue since I'm sure that was not the amount withheld and paid.
You might get a small deduction for the tax, so I suggest you find out from your employer what the amount of the tax was, or leave Box 14 on your W-2 blank.
Selecting Oregon Statewide Transit Tax and entering your full income in Box 14 would not be right.
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"