Since you're not in one of the QSO party states you don't need to give your county. ND, SD, and NE are looking for RST and ST. MI is looking for a serial number and state.
You can find links to all the QSO party rules at http://qsoparty.eqth.net/
. There is a state QSO party just about every weekend. Sometimes more than one, like today.
The rules will include the county abbreviations.
73, Alan N5NA