The other night I went to see The Strangers with my favorite person, Ngoc Nguyen. The film begins with a caveat, "The horrifying events that took place in the Hoyt family's vacation home at 1801 Clark Road on February 11, 2005, are still not entirely known." We are also told that the film is "inspired by actual events." Those inspirational events most likely included watching Helter Skelter and maybe Fatal Vision. But the "based on actual events" gimmick is a tried and true one; and one indicative of The Stranger's formula-following strengths and weaknesses.
Is there anything scarier than hippies?
One guy went to the trouble of mapping the address given in the film and many others have taken the opening claim as truth. I'll try to help by adding that I heard the cry of a Great Horned Owl at several points and I've included this handy map of their range so that we can narrow it down further.