41 and counting
Virginia, West Virginia, and South Carolina are the latest states to pass data breach notification laws, bringing to 42 the total number of states with such laws on the books (including the one state with a law that applies only to public entities, Oklahoma)
See More Breach Notification Laws — 42 States and Counting at the law blog of Proskauer Rose.
Is there any reason that you need more? Aren’t the breach laws contagious across state boundaries?