There was probably census data used for a ball-park count of rural residents, with an arbitrary figure per acreage.
In some counties, acreage is often zoned as *farm land* for lower property tax purposes. The Federal bureaucrats are not above calling six tomato plants, a row of corn and 6 egg laying Rhode Island whites as a farm;) LOL!!
I might qualify even.
I thought the same thing when I read that Obama had gotten the number of black farmers inflated by 50,000.
If I'm tracking the facts of this story correctly, the initial complaint only involved 400 farmers, which was then somehow inflated to 86,000 farmers.
That comes to 1,720 black farmers for every state in the union. Riiiiiiiight......