Mary, Helen Maxwell Williams lists as location for this as: Jefferson Prairie/East and West Bergen Cemeteries, which are just across the road from Manchester Township and Leroy Township Boone County IL, and in Rock County WI. (The congregation split when building a newer Jefferson Prairie Church, some went to East and some to the West.) The cemetery is located just across the road from Manchester Township and Leroy Township Boone County IL, but in Rock County WI.