The state containing the southernmost point on the continental united states is Florida, and it can be found at Ballast Key which is an island in the Florida Keys. The line of latitude is 24.5211 degrees North latitude. However, if we are referring to all 50 states of the USA, which includes Hawaii, then the southernmost point can be found on South Point road on the big island in Hawaii at 18.9107 degrees North latitude.
