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).
Erie is the cheapest insurance company, and arguably the most reliable insurance company as well. They score points by allowing customers to start their quote online, which we personally found to be a streamlined and fast process. Erie also scored the highest marks from the number of policies they offer. Erie offers pet coverage, free accident forgiveness, free vanishing deductibles, roadside assistance, and many more, essentially giving its customers a degree of flexibility not even found amongst the largest insurers. Customers of Erie may also be eligible for its Rate Lock program. This is a unique program where customers won't see their rates increase except for three reasons: you move to a different area, add or remove someone from your policy, or add or subtract a car. Lastly, despite its smaller size, Erie offers the same types of discounts larger national insurers provide such as bundling, anti-lock brakes, anti-theft, young driver and senior driver among others.
If you own a car, car insurance is a required expense in 48 of the 50 states. A lack of diligence when shopping for your car insurance could lead to a hefty monthly bill, as well as headaches if you actually need to file a claim. We researched and explored quotes from over 128 companies in 2,700 cities to determine which insurers had the lowest costs, nationally and in each state. Our team also evaluated which companies had the best track record for customer service and the claims process.

Insurance experts suggest that you compare car insurance policies every time your current policy is up for renewal (typically every six months to a year). Before you launch your quote hunt, review your existing policy and see if your needs have changed. For example, many auto lenders will require you to have no more than a $500 deductible in comprehensive/collision coverage—but once you pay off your car loan, you can increase this deductible and save a considerable amount on your insurance premiums.
Property and casualty insurance provided by United Services Automobile Association, USAA Casualty Insurance Company, USAA General Indemnity Company, Garrison Property and Casualty Insurance Company, based in San Antonio, TX; USAA Limited (UK) and USAA S.A. (Europe) and is available only to persons eligible for P&C group membership. Each company has sole financial responsibility for its own products.
Example (Comprehensive): You park your car outside during a major hailstorm, and it's totaled. If you have comprehensive, we'll pay out for the full value of your car (minus your deductible amount). Example (Collision): You back out of your garage, hit your basketball hoop, and cause $2,000 worth of damage to your vehicle. If you have collision, we'll then pay for your repairs (minus your deductible amount).
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