Thanks for the info. You are searching in the same general area as I am and for the same time period, but these are not related.
I had already found my great-grandparents, Andy and Annie, on the 1900 and 1910 census, but did not see them on the census index for 1920. I just solved the mystery by searching the entire Banks Township where they lived in 1920. It turns out that my great-grandfather, Andy, had died and Annie had already re-married Joseph Bican. My grandfather also did not show up on the index because he and my grandmother were living in the same household and therefore were not indexed. I still need to get the death certificate to hopefully find out his parents' names and village in Slovakia.