I found no official listings for a McCown Cem but did find a McCown Cem in Neshoba Co on Findagrave (no map) that lists the community as Arlington and has several entries. Arlington is north of Philadelphia on Highway 19 around the junction of Marty Stuart Rd. On the MS Dept of Transportation map there is a cemetery marked on County Rd 3401 which is west of Highway 19 and north of Marty Stuart Rd. It is not noted on satellite maps of the area. This may be the McCown Cem. There is also the Pearl Valley Cem at the junction of Highway 19 and Marty Stuart Rd that is marked on some satellite maps.

MDOT MAP for Neshoba Co, Ms....
http://www.gomdot.com/Divisions/IntermodalPlanning/Resources...

I do not suggest going to Findagrave site at this time since they are having some problems with malware.