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A lot goes into an auto insurance rate quote, including your ZIP code, coverage levels, marital status, annual mileage, driving history and vehicle make, year and model. In most states, your gender and credit history are also used to determine rates. And again, the reason auto insurance comparison shopping is so important is because rates between companies are different for each person, too.

While competition certainly helps keep premiums in check, it’s not the only factor. “In addition, under Virginia’s laws for seeking recovery, the person at fault for causing a car accident is held responsible for any resulting harm,” says Schrad. “Virginia also requires uninsured motorist coverage as part of a driver’s own auto insurance plan in case they are involved in an accident with an uninsured driver,” he continues. Not all states require drivers to carry uninsured motorist coverage.

On the other hand, states where most of the drivers are properly insured and reside in rural areas saw some of the lowest car insurance rates. Maine climbed to the top of the heap this year with an average annual premium of $845, which is 42 percent below the national average. Wisconsin moved into the second place and Idaho stays in third place for the second year in a row. Iowa and Virginia filled out the top five.

In most states, a DUI is the most costly violation you can receive. Moreover, in states like California, it will stay on your insurance record for 10 years! Based on our analysis of the most popular car insurance companies, this would set you back an average of $1,200 in insurance rate increases during that 10-year period. To limit costs, do your due diligence and shop around: Progressive and USAA are the cheapest insurance options after a DUI — consider starting with those providers.

NerdWallet averaged rates for 40-year-old men and women for 20 ZIP codes in each state and Washington, D.C., from the largest insurers, up to 12 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:
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