#1. The Safest Neighborhoods in Lake County, IL Green Oaks, Libertyville Township, IL Learn more Population: 15,699 Median Age: 48 Family-Households: 70% Median Household Income: $147,252 Average Commute (mi.): 29 Median Home Value: $526,908 Median Monthly Rent: $1,362 Renter-Occupied: 22%