There were a total of 53 shark attacks in American waters in 2013. Florida came in first with a reported 24 attacks; Hawaii coming in at number two with 16 attacks.
via Huffington Post:
South Carolina saw as many attacks as California (4) and one attack was reported in each of the following states: North Carolina, Oregon, Texas, New Jersey, and Alabama.
The data comes from the Shark Attack File, which is part of the nonprofit Shark Research Institute. To check out The File and read the full write-up hop on over to HuffPo.