The parish of Bolton le Sands included other townships as well, including Carnforth, Over Kellett and Nether Kellett.
However, looking at the wording of the entries around, this clergyman kindly gives us township names, so I'd expect Rishton House to be in the Bolton-le-Sands area.
There is not a great deal of old property along the current A6, a turnpike dating after 1735, but a reasonable number of buildings cluster around Holy Trinity church. Few of them have names I can see on Streetview though.
There may be directories which give a clue about the house and inhabitants. I'd expect Lancaster library to have the best collection of them.