Check this out http://tssaa.org/Classifications/report.cfm and keep in mind that historically, Region 1 = Districts 1 and 2, Region 2 = Districts 3 and 4, Region 3 = Districts 5 and 6, Region 4 = Districts 7 and 8, Region 5 = Districts 9 and 10, Region 6 = Districts 11 and 12, Region 7 = Districts 13 and 14 and Region 8 = Districts 15 and 16.
Sorry, link is not working, but you get the idea.