The Post Office was est there in 1856. Clark was at one time located south of Evansville Blenheim was located north of Evansville where the creek goes into the Kaskaskia River. O'Harra was located haflway between Evansville and Ruma on Rt 3. A Post Office was est in 1830 and closed in 1835. The area was first settled by Henry O'Harra.
Nothing remains today.