On my Maryland state tax return it is requesting the MD county that my spouse lived in but we were not married when I lived in Maryland. How do I properly fill this out?

My spouse lived in Washington state the whole year and we didn't get married until October of 2017. I became a Washington resident in May of 2017. She wasn't a resident of Maryland nor did she receive income in Maryland. Should I just leave the county blank as it is only populating Maryland counties in the drop down?