Ohio does. Conferences are chosen by the schools. Completely unrelated to eventual tournament region or size of school (4A and 3A can conference together). The state is then broken up into sectional of 14 to 18 teams based on division (4A, 3A although it is Div 1, 2 and 3). The coaches from each sectional get together and vote for the top 4 seeds. Those seed get to pick their spot on tournament chart. Everyone else is selected at random. Works pretty well.
