Futaba is the only company that lists any specific range numbers, and they only list them for a handful of their receivers. The ones that are described as "Park Flyer" models, and list a range, say approximately 650 feet.

When the original DX6 & park flyer receiver was released, people were posting on RCU that they were flying large gasoline powered models with it at very long range. You can still find the threads by doing a search.

I would not risk using any "Park Flyer" receiver in a model that might be flown more than 650 feet away.