I am interested in this line as I am decent from Mary A Wagner & Levi Buffington. I came across the same compilation but suspect that a 20 year gap exists with Mary Ann. Buffington children with Levi are listed starting with Albert in 1845 and continued until 1865 when my direct ancestor Laura Virginia was born. It is unlikely that Mary Ann gave birth to her if born in 1802. The Baltimore census record from 1860 has her as 37; the 1880 census 58 which could be read as 78. I tend to think that she was born in 1822 and is sibling of James Frederick Wagner born 1820.
Do you think is possible that Upton was their father during his short adulthood?
Thanks for stimulating my interest in this branch again.