In the 1900 US Census for Ward 3, Montclair, Essex County, New Jersey the family of William R. Dix was enumerated as follows:
Dwelling #99; Family #100
Dix, William R.; Head; W; M; b. Nov. 1846; 53; Married 19 years; b. New York; Both parents b. Massachusetts; salesman; Can read, write and speak English
Dix, Susie L.; Wife; W; F; b. Feb 1857; 43; Married 19 years; mother of 5 children; 3 children living; b. Connecticut; both parents b. Connecticut; Can read, write and speak English
Dix, Mary E.; Daughter; W; F; b. Aug 1881; 18; Single; b. New York; Father b. New York; Mother b. Connecticut; At school; Attended school 9 months within the year; Can read, write and speak English
Dix, Irving H.; Son; W; M; b. Dec 1882; 17; Single; b. New York; Father b. New York; Mother b. Connecticut; At school; Attended school 9 months within the year; Can read, write and speak English
Dix, E. Louise; Daughter; W; F; b. Oct 1886; 13; Single; b. New York; Father b. New York; Mother b. Connecticut; At school; Attended school 9 months within the year; Can read, write and speak English
Wilder, Amanda; Servant; W; F; b. May 1867; 33; Single; b. North Carolina; Both parents b. North Carolina; Cook; Can read, write and speak English
They were living the same place in 1910. By 1920 they had moved to Washington, Mercer County, New Jersey, where they are also found in 1930.