You could also try a tried and proven method of getting permission. Go to a small town cafe around breakfast time and sit with the locals. Converse a little and bring up the point that you are out scouting for some place to get a deer. Most times you'll have a farmer offer to let you hunt for free.

Second way is drive up to a farmers door and say "Got any deer need killin?" First time a buddy of mine did that with me around I thought we were going to get shot, but the farmer looked at him and said "They're bedding down North of here in the creek bottom, kill them all." He has done it several times since then when I was hunting with him and we've only been turned down once.