It is important to find the enumeration districts...even for those who have ancestors in rural areas, like me. If you "know" the rural location, I find that the maps are easier to use than any of the other online finding aids. I save Steve Morse's site for urban people's enumeration districts.
This is part of a map for Hancock County, Illinois, Prairie Township. This is where my paternal grandparents should be located in 1940. Their farm is close to the Prairie/Carthage Township line--in fact Carthage township's border "jogs" on the east side as can be seen in the map below. There is also the City of Carthage as well.
- Prairie Township appears to be 34-29.
- Elvaston appears to be 34-27
- Village of Ferris (cut off mostly in the image) appears to be in two enumeration districts (because it is in two separate townships. The southern strip appears to be in district 34-28 and the rest of the village appears to be in enumeration district 34-30.
- The city of Carthage appears to be in district 34-6.