Idaho is pretty sparsely populated and mainly rural which leads to lower car insurance rates. According to World Atlas, Idaho has the seventh least population density in the country. There are roughly 20 people for every square mile. Wide-open spaces with few people mean fewer cars out on the road and fewer accidents, everything an insurance company loves.
The numbers we cite above are reflective of a 30 year old male driver who has a clean driving record and is single. Your own rates will change based on your own driving history and profile. The best way to determine who will give you the most affordable auto insurance is by comparison shopping. To start looking at car insurance quotes, put your zip code in one of the two boxes up top.
Note that USAA ranked in the first or second spot in almost all cities, but we've excluded them from this table because the company only serves military and affiliated members. Below is also a deeper dive by the largest cities of the most affordable insurers by age and marital status to give drivers a further idea of the going rates for auto insurance. We've excluded USAA from the city specific tables as well.

NerdWallet compared quotes from these insurers in ZIP codes across the country. Rates are for policies that include liability, collision, comprehensive, and uninsured/underinsured motorist coverages, as well as any other coverage required in each state. Our “good driver” profile is a 40-year-old with no moving violations and credit in the “good” tier.


According to the Insurance Information Institute’s table of Automobile Financial Responsibility Laws by State, 49 out of all 50 states, as well as the District of Columbia, require you to have some sort of liability coverage for all vehicles on the road, including RVs. The only exception to this rule is the state of New Hampshire, which has no mandatory insurance law, and only requires financial responsibility from the person at fault in a car accident.
Auto insurance is financial protection, and not just for the investment you made when you bought your car. After a really serious accident, bills for damage and injuries can easily reach into hundreds of thousands of dollars. If you happen to cause such a wreck, the victims could sue you. In the worst case scenario, assets such as your savings and home could be seized.
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