Check here for all the cemeteries that have been walked in Pawnee County.
Jennings Cemetery. That's it. I found a map to it and that is right where it is. I remember you go half-way through town a bit, turn left and then right at the first section intersection. The cemetery is on the left.
The first time I went, it was in real bad repair. The second time it was really fixed up...someone was keeping it up.
http://www.epodunk.com/cgi-bin/genInfo.php?locIndex=148929