Illinois State Route 120 is a east-west highway through Central Lake County. Much of this runs along Belvidere Road. IL St Rt 120 passes thorugh the following towns in Lake County. Waukegan
Park City Gurnee
Grayslake
Hainesville
Round Lake Park Round Lake Volo Lakemoor IL St Rt 120 is not multi-plexed in Lake County. IL St Rt 120 intersects the following highways in Lake County. Illinois State Route 131, at Waukegan.
The eastern end of IL St Rt 120. The eastern end in Waukegan. The junction marker on SB U.S. Rt. 41. A BGS on SB IL St Rt 43. A BGS on I-94. EB IL St Rt 120 near IL St Rt 83. EB IL St Rt 120 in Grayslake. EB IL St Rt 120 in Hainesville. A junction marker on EB IL St Rt 134. A junction marker on SB U.S. Rt. 12/IL St Rt 59.