This graphic takes the top insurance providers in Naperville, IL and compares the average monthly cost of their respective premiums against the average cost of $282. The state’s top providers, and the percent difference that is between their average monthly cost and the average cost in the city as a whole are: Allstate (39%), Farmers (30%), GEICO (-9%), Nationwide (-33%), Progressive (10%), State Farm (-31%), and USAA (-35%).