Hilldale was a planned community in Hill Valley. It was first constructed around 1985 and existed to at least 2015. It appeared to cover a large area over several blocks of town. A railroad line that connected to Eastwood Ravine ran behind the development, which became the location of destruction for the DeLorean time machine.
However by the 2010s, it had become rundown much like Lyon Estates. The sign was graffitied over with Hilldale: The Address of Success altered to Hilldale: The Address of Suckers.
Officer Reese was of the opinion that because of the kind of people Hilldale attracted, the whole place should be demolished. (See Quote above.)
Marty McFly and his wife Jennifer Jane Parker McFly lived there with their family. However, with the alterations to the timeline that followed, it is uncertain if they lived there afterward.