1880 Census for New York City, New York  shows  Kennedy household:  Sarah , Race "W",  Gender "F",  Age "18" [which does not match her burial records nor the record from the church in 1862 where Matilda is listed after her] , marital status "S", occupation "teaching school", number of months employed in the census year "9",  Birthplace "Ireland", Father's birthplace "Ireland", Mother's birthplace "Ireland".   Other people in the household were her father, James Kennedy,  her sisters Mary, Lizzie, and Matilda, as well as a servant named Ellen Kuhan.