Insurance policies are generally available in three tiers of coverage: High, Medium, and Low. This graphic compares the average monthly rates for these three insurance coverage levels as offered by each of the top providers in the state. The most expensive insurance provider in Naperville, IL for High levels of coverage is Allstate at $431 on average per month, and the least expensive provider is Nationwide at $203. As for Medium levels of coverage, the most costly and the least expensive providers are Allstate and USAA at $417 and $198, respectively. And, finally, for Low coverage, the insurance provider that charges the most on average is Allstate at $404, and the one that has the lowest average monthly premium is USAA at $183.