I live in NW Ohio and from my understanding we don't have any size limit on the land you can hunt. If you owned 1/2 an acre and are not in a residential area that restricts hunting you can hunt on it.

I know many guys that do this, one that hunts next to my parents farm heonly owns about a 6 acre slice of land that has nothing on it and he harvests a deer from that spot most years.

Don't know of any limitations on the size of the land you hunt, only on the location of it.