Who was on the US 500 dollar bill?

The most recent incarnation featured William McKinley, though bills issued before he became president didn't, for obvious reasons. There have been numerous designs, and if you mean something other than the most recent style, you'd need to be more specific as to when they were printed.
The most recent incarnation featured William McKinley, though bills issued before he became president didn't, for obvious reasons. There have been numerous designs, and if you mean something other than the most recent style, you'd need to be more specific as to when they were printed.