I'm not sure if you are familiar with Salem and the surrounding area,but the train tracks run right through it and behind a churchcalled Salem Methodist and I think that cemetery might have been used as a "city" cemetery. There are a few more churches not far from the tracks. Do you know if your Grandmother Mary's husband was William M? If so, I found them on the 1850 census. The children listed were: John J 4 yrs; William N 2 yrs; Jesse Parker 5/12. I just want to make sure I have the right people.
Also, would you happen to be related to the Tucker family that possibly came from the same area? Just wondering. There is a family cemetery in Salem that I have been curious about. It has a few unmarked graves.