New York, State Census, 1875, index and images, FamilySearch (http://familysearch.org/James Shelvin, Warden of Kings County Penitentiary.
James Shelvin was Warden of Kings County Penitentiary. The 1875 New York State Census included names of staff and prisoners. He is listed as 24, male, born in Ireland, Warden, naturalized , owner of land; next is Margaret Shevlin, 29, female, married.