The modern use of GPS sometimes makes researchers think that every location can or should be known with exact precision. That’s not always possible nor is it always necessary. Only include in your database locations as precise as the actual record indicates. Don’t assume any more precision than the record provides.
A marriage record for an ancestral couple indicated they married in Coshocton County, Ohio, in 1830. Based upon other records for their families it’s probable that the couple married in or near Jackson Township. But the marriage record does not state that–either directly or indirectly. My suspicion regarding the location could be put in my notes for that couple along with the evidence that supports that conclusion.
Sometimes our knowledge of the location will only be as specific as the county–and that’s okay.