Illinois 81 is a fairly short east-west route running entirely in Henry County, but nearly spanning the county. It connects several towns to each other.
Intersections from east to west:
IL81 begins at US150 in western Henry County
IL82 joins from the south at Cambridge for about 1 mile
Then IL82 breaks off east of Cambridge
IL81 ends at IL78 in Kewanee.
It passes through these towns: Andover, Cambridge, and Kewanee.
