In the 1871 census 18 Newcastle Street, St. Mary Le Strand, St. Clement Danes, London. Head William O’Neill, age 38, ???? Tailor, born Maidenhead, Berkshire. Wife Martha O’Neill, age 40, born Reigate, Surrey. Daughter Mary A. O’Neill, unmarried, age 17, born St. Clement Danes, Westminster. Son John J. B. O’Neill, age 13, scholar, born St. Clement Danes. Daughter Amelia K? O’Neill, age 11, scholar, born St. Clement Danes. Son William P. O’Neill, age 10, scholar, born St. Clement Danes. Daughter Ellen M. O’Neill, age 6, scholar, born St. Clement Danes. Daughter Emilie A. O’Neill, age 4, born St. Clement Danes. Daughter Alice M. O’Neill, age 3, born St. Clement Danes. Daughter Rose M. O’Neill, age 9 months, born St. Clement Danes.

In the 1881 census 18 Newcastle Street, St. Mary le Strand, London. Head William O’Neill, age 48, tailor, born Berkshire. Wife Martha O’Neill, age 49, born Reigate, Surrey. Daughter Mary Ann O’Neill, unmarried, age 27, dressmaker, born Westminster, Middlesex. Son John J. O’Neill, unmarried, age 23, clerk, born, Westminster. Daughter Amelia C. O’Neill, unmarried, age 21, gold embroideress, born Westminster. Son William P.? O’Neill, unmarried, age 20, artist, born Westminster. Daughter Ellen M. O’Neill, age 16, Teacher (sch), born Westminster. Daughter Emily A. O’Neill, age 14, apprentice, born Westminster. Daughter Alice M. O’Neill, age 13, scholar, born Westminster. Daughter Rose M. O’Neill, age 10, scholar, born Westminster. Son Hugh E. O’Neill, age 8, scholar, born Westminster.