Texas just added 6A, but its a little deceiving, as 1-4 have two divisions, so Texas has 10 classifications...but then again, the state rather large.
Class 6A: 2,100+
Class 5A: 1,060-2,099
Class 4A Division I: 686-1,059
Class 4A Division II: 465-685
Class 3A Division I: 315-464
Class 3A Division II: 220-314
Class 2A Division I: 158-219
Class 2A Division II: 105-157
Class 1A Division I: 55-104.9
Class 1A Division II: 54 and fewer