NerdWallet averaged rates for 30-year-old men and women for 10 ZIP codes in each state and Washington, D.C., from the largest insurers in each state. “Good drivers” had no moving violations on record and credit in the “good” tier as reported to each insurer. For the other two driver profiles, we changed the credit tier to “poor” or added one at-fault accident, keeping everything else the same. Sample drivers had the following coverage limits:
Because most forms of insurance are regulated at the state level, state legislation influences car insurance premiums. For instance, in Michigan, a no-fault state, state law requires an unlimited amount of Personal Injury Protection coverage, a requirement that increases the cost of car insurance. Although each state legislates insurance differently, auto insurance prices may vary on a zip code-by-zip code basis. Below is an analysis of the cheapest and most expensive states for car insurance (from The Zebra's State of Insurance study).
Like we said earlier, comparing car insurance quotes gets a lot easier if you establish how much coverage you’re looking for before you shop around. You’ll want all the quotes you pull to have the same coverage types, limits and, of course, deductibles. How else will you know what insurer is, in fact, offering the best price? Here’s a quick rundown of how to figure out what type of policy you need.
Type of car: If you have an expensive or powerful car then you are seen as a higher risk for a number of reasons. If it’s expensive, it has a higher risk of being stolen. If it’s powerful, it’s deemed more at risk of getting into an accident driving at speed. If you want to see how your car impacts your insurance, you can check which insurance group it’s in for an indication.  

Source: Insure.com, from a study commissioned by Insure.com from Quadrant Information Services. Averages are based on a 40-year-old male driver who commutes 12 miles to work, with policy limits of 100/300/50 ($100,000 for injury liability for one person, $300,000 for all injuries and $50,000 for property damage in an accident) and a $500 deductible on collision and comprehensive insurance. The policy includes uninsured-motorist coverage. Rates were averaged across multiple ZIP codes and insurance companies. Average rates are for comparative purposes; your rate will depend on your personal factors.
The above is meant as general information and as general policy descriptions to help you understand the different types of coverages. These descriptions do not refer to any specific contract of insurance and they do not modify any definitions, exclusions or any other provision expressly stated in any contracts of insurance. We encourage you to speak to your insurance representative and to read your policy contract to fully understand your coverages.

Between September and December 2017, The Zebra conducted comprehensive auto insurance pricing analysis using its proprietary quote engine, comprising data from insurance rating platforms and public rate filings. The Zebra examined nearly 53 million rates to explore trends for specific auto insurance rating factors across all United States zip codes, averaged by state, including Washington, DC.
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