According to his obituary, Moses Clark moved to Worcester, Massachusetts in 1897.  I have not yet located him on any 1900 census, which most likely means that his name was indexed incorrectly or that the record is in some way illegible.

I have begun the rather tedious process of reviewing every page of the census looking for his name. While this is not too arduous for towns the size of Wilton, Maine or Calloway, Kentucky… sorting through every District in the city of Worcester, Massachusetts is quite a task.

I also searched the city of Clinton (where Moses and May were married) but he does not appear to be a resident of that town in 1900.  I will update this narrative when I have completed the job.