Oregon Geographic Names by Lewis A. McArthur lists a "Clarke" Oregon, also called "Clarkes." Clarke - Clackamas County. Clarke is a crossroads community in the Highland district about fifteen miles southest of Oregon City. In pioneer days this was known as the Ringo Settlement.... Post office, called Clarkes, was established May 13, 1889, with (Irving L.)Clarke as first postmaster. The office was closed December 13, 1904. Hope this helps - as I always do, I highly recommend that anyone doing Oregon research have a copy of the great book, Oregon Geographic Names - any version! Mimi Stang