[tfourb]

Yes, farms need market access. But that market does not have to be a sprawling suburb, it can be a decently dense town or city. Also, market access is relative depending on product. Farmers concentrating on crops like wheat and corn don't care about the distance to cities, as their product is traded globally. For fresh produce, distance is a real concern, but on the other hand you don't need a lot of land to fulfill the need of even large cities. You could conceivably provide most fresh produce from inside city limits if urban planning would see this as necessary. Production/acre for something like tomatoes is really huge, depending on the methods used.