1900 Census New York City, Ward 20, Enumeration District 207, Vicinity of 10th Avenue and West 26th Street in Chelsea neighborhood: Sheet 2, Household 40 --- Patrick COSTELLO and wife Mary, both born in Ireland, with these children born in NYC: Patrick, Jr., Stephen, Kate, Agnes and Minnie. Sheet 3, Household 143 --- William COSTELLO and wife Margaret Raftery/Raftree, both born in Ireland, with these children born in NYC: Della, Mildred, Hazel.