10 costliest states for teen driver insurance, a Bankrate-owned website, commissioned Quadrant Information Services to analyze the cost of adding a young driver between ages 16 and 19 to a family's existing car insurance policy. Quadrant calculated rates using data from the largest auto insurance companies in each state.

Nationwide, teen driver insurance boosted the family's annual premium by an average of 84 percent, or about $2,000. The disparities between states are related to differences in geography, regulation and driving patterns, says Michael Barry, spokesman for trade group the Insurance Information Institute.

1. Arkansas

Average car insurance increase when a family adds a teen driver: 116.34%


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