How many [custom] windmills are in Illinois?
There are currently five windmills in Illinois. When commenting on the condition of the Graue Mill (a restored water mill in DuPage County), Leslie C. Swanson, author of Old Mills in the Midwest, writes 1,800 old mills…once dotted the Illinois landscape. I do not know how many of those 1,800 mills could have been windmills. Even in frontier Illinois, wind-powered mills were scarce because of their unreliability. To date, I am aware of FIFTY windmills that used to stand in this state.