Generally, you do not need to file an IN county tax return. Your employer is required to withhold county and you cannot get it refunded (unless there was an error in the amount) as the reciprocal agreement does not apply.
If you are trying to file an IN county return for purposes of claiming the credit on the MI return, be advised MI will give you a credit for IN county tax paid, but it's a hassle.
For details, see https://ttlc.intuit.com/questions/3418266-i-live-in-michigan-and-work-in-indiana-i-m-being-charged-e...
