Because of where I currently live, I am always up for finding the memorial stone for the "Pilgrims" that seem to be scattered all over Plymouth County. It's a fun project. If you know of any others, please let me know. Remember, these are memorial gravestones not the ones put there when they died.
These are the ones I have located so far (please feel free to add them to your collection.)
Elizabeth Tilley (his wife)
Priscilla Mullins (his wife)
I had a great comment to this post. John Howland is buried on his own land in Duxbury but that resting place is not marked. The memorial stone is in Burial Hill in Plymouth but as it is a memorial stone it doesn't mark a grave. Elizabeth Tilley's memorial gravestone is in the Ancient Burial Ground RI Cemetery #5 in East Providence, RI (which once was Swansea, MA). She may be buried with the Brown family, but that I don't know. The stone is a memorial gravestone.
When John Howland died, his wife Elizabeth went to live with her daughter who married a Brown and died there.