Bankrate has comprehensive state-by-state map of 529 college savings plans. In case you're not familiar, a 529 plan is a "tax-advantaged" savings plan that is designed to encourage people to start saving for college tuition. From the SEC:

There are two types of 529 plans: pre-paid tuition plans and college savings plans. All fifty states and the District of Columbia sponsor at least one type of 529 plan. In addition, a group of private colleges and universities sponsor a pre-paid tuition plan.

529 college savings plans [Bankrate]
An Introduction to 529 Plans [SEC]
The Worst 529 Plans [Motley Fool]
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