In the 1871 census Prospect Place, Gateshead, Durham.
Head William Coates, age 25, cast iron founder, born Gateshead, Durham.
Wife Margaret Coates, age 20, born Seaton Sluice, Durham.
Son John Coates, age 2, born Sunderland, Durham.
Daughter Mary Jane Coates, age 2 months, born Bensham Gateshead, Durham.

In the 1881 census 15 Rothsay Street, Monkwearmouth, Durham.
Head William Coates, age 36, metal moulder, born Gateshead, Durham.
Wife Margaret Coats, age 31, born Seaton Sluice, Northumberland.
Son John Coates, age 12, born Deptford, Durham.
Daughter Mary J. Coates, age 10, born Deptford, Durham.
Son William Coates, age 8, born Deptford, Durham.
Daughter Margaret Coates, age 6, born Grange Durham.
Daughter Elizabeth Coates, age 3, bornGrange durham.
Son Thomas Coates, age 1, born Hylton, Durham.

In the 1891 census 19 Clayton Street, Throston, Durham.
Head William Coates, age 45, iron moulder, born Gateshead, Durham.
Wife Maryrah Coates, age 41, born Whitley, Northumberland.
Son John V. [or U] Coates, single, age 22, iron dresser, born Gateshead.
Son William Coates, single, age 18, machinist, born Gateshead.
Daughter Elizabeth Coates, age 13, born Durham City.
Son Thomas M. Coates, age 11, scholar, born Sunderland, Durham City.
Son Charles B., scholar, born Sunderland, Durham City.
Daughter Mary J. Coates, age 6, scholar, born Sunderland, Durham City.
Daughter Isabella Coates, age 4, born Sunderland, Durham City.
Daughter Annie Coates, age 2, born Hartlepool, Durham City.
Son Matthew Coates, age 7 months, born Hartlepool.