We own 720 acres total in Zone 9, so i know a little bit about it. The others are correct, theres a lot of public land. Try Sny Magill(public something, i dunno the exact name, we just call it Sny Magill around here)..Bloody Run Park..Yellow River State forest..all are in Allamakee/Clayton County, near the river, best big buck areas around. They get hunted by others, but if you do legwork, you'll be fine.
I'm sure if you came out in july with a platbook and full tank of gas and covered some ground, you could find some farms to hunt if you're bowhunting.
PM me, i can get some more detailed information for you if you need it.