Of the biggest auto insurers in the U.S. - State Farm, GEICO, Allstate, Progressive and Farmers - State Farm ranks as the greatest overall. State Farm was rated 4/5 stars by customers and policyholders in a JD Power survey on companies shopping experience. State Farm is best known for its large agent network; they boast over 18,000 across the nation. It shouldn't be surprising then that State Farm gets 5/5 stars for how its agents interact with customers. As well, State Farm is great when it comes to offering discounts. If you go with State Farm you will have up to 15 discounts to be eligible for which can equal hundreds of dollars worth of savings.