Have you considered the people recorded in census returns as living "near" your known ancestors? In many cases, family members did not move too far away.
It can be worthwhile to select a few likely names from up the road or around the corner and run a search in Ancestry (or your choice of on-line provider). What you are looking for is not evidence that these people belong in your tree but the contact details of other family historians who are interested in them.
Even if there is no blood relationship between you, who knows what you could gain from another researcher interested in the same geographical location at the same period in history.