We first looked for companies that received an "A-" or better (“strong”) from A.M. Best, a rating agency specifically focused on the insurance industry. Then, because the III recommends getting ratings from more than one agency, the best needed to earn at least an "AA-" (“very strong”) from S&P Global or an "Aa3" (“excellent”) or higher from Moody’s.
We collected quotes from a variety of insurance companies across 142 towns and cities in California. Our sample driver was a 30-year-old male who drove a Toyota Camry. To obtain quotes, we kept parameters for getting coverage the same, such as that he was single, had a good credit score and a clean driving record. The only parameter that changed was the zip code where he lived in California. The amount of coverage we opted for gave our driver bit more than what is required of state minimums.