Here's a list of the deadliest Atlantic Basin hurricanes in modern times (1900 and more recent), based on data compiled by the National Hurricane Center. The first column is the name (if the storm is pre-1950 and has no name; instead, I'll list the point of landfall). The next three figures are the storm's category at landfall, the year it struck and the death toll.
Galveston, TX 4 1900 / 8000
Lake Okeechobee, FL 4 1928 / 2500
KATRINA 3 2005 / 1500
AUDREY 4 1957 / 416
Keys, FL 5 1935 / 408
Miami/Pensacola FL 4 1926 / 372
---D.M.