Illinois State Route 131 is a north-south highway in Eastern Lake County. It runs along Green Bay Road. This extends from the Illinois/Wisconsin State Line to Illinois State Route 173 at Lake Bluff. IL St Rt 131 passes through the following towns in Lake County. Zion
The northern end of IL St Rt 131 at the Illinois/Wisconsin State Line. SB IL St Rt 131 at the Illinois/Wisconsin State Line. SB IL St Rt 131 at the Illinois Welcome Sign. A junction marker on Lake County Highway A1. A street sign on IL St Rt 173. A junction marker on EB IL St Rt 137. SB IL St Rt 131 in North Chicago. SB IL St Rt 131 in Lake Bluff. A junction marker on EB IL St Rt 176. The southern end in Lake Bluff. The southern end marker.
