I knew Ehmen was in Adams County, Illinois, and eventually ended up in Dawson County, Nebraska, but was unaware of his residence in Knox County, Illinois. Hopefully Kaiser's testimony is accurate and his knowledge of the information firsthand. Some witnesses' answers to this question are vague and not as detailed as Kaiser's answer is. Kaiser also does not indicate whether or not he lived near Ehmen in these locations, only that he has known him for over twenty years.
Note: this image was taken from "Nebraska, Homestead, Records, 1861-1936."
Note 2: Ehmen is a first cousin of Focke Goldenstein, my ancestor who also homesteaded in Dawson County, Nebraska.