www.familysearch.org/hr/search
Here's what I found in a quick glance...
"United States Census, 1920," database with images, FamilySearch (
https://familysearch.org/ark:/61903/1:1:M6ZZ-P72 : 14 December 2015), William L Cope, Williamston, Anderson, South Carolina, United States; citing sheet 13B, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,821,685.
"United States Census, 1910," database with images, FamilySearch (
https://familysearch.org/ark:/61903/1:1:M562-GV3 : 29 October 2015), William L Cope, Pickens, Pickens, South Carolina, United States; citing enumeration district (ED) ED 147, sheet 20A, NARA microfilm publication T624 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,375,483.
Play with the search fields and see what you can pull up. Good Luck!
-P Rich