eBook subscription company Scribd has tabulated the most popular book by state throughout the 50 states in the US.
American Gods by Neil Gaiman is the top choice among readers in Illinois; The Bedwetter: Stories of Courage, Redemption and Pee by Sarah Silverman reigned in New York; Murder on the Orient Express by Agatha Christie was the top choice among readers in Texas; and The Family Vault by Charlotte MacLeod led the list for Vermont. The list takes into account, not just book sales or downloads, but the actual reading habits of its 80 million monthly readers.
Parade has the entire list at this link. The Washington Post has a great map to help you visualize who likes which books a