Illinois Route 99 is a north-south route mainly in Schuyler and Brown Counties in west-central Illinois. It begins at Illinois 101, goes south to serve as the main north-south route in Mount Sterling, and then connects that town to Meredosia to the southeast.
Illinois 99's northern end is at Illinois 101 at Brooklyn:
Illinois 99's northern end is at Illinois 101 at Brooklyn:
In Mount Sterling, Illinois 99 joins US Route 24 east for a bit...
Still in Mount Sterling, Illinois 99 splits from US Route 24 to continue south again:
On the south side of Mount Sterling, Illinois 99 bends southeasterly and spawns Illinois 107, which heads due south:
After passing through Versailles, Illinois 99 ends at Illinois 104 on the opposite bank of the Illinois River from Meredosia. Traffic can continue east on Illinois 104 to reach the Jacksonville area:
