1900 census of Trenton City, Mercer, New Jersey
830 East State Street
Household
William W Lucas - born July 1865 in New Jersey
Ena S Lucas - born July 1868 in New Jersey
Ethel M Lucas - born November 1889 in New Jersey
Eleaner Lucas - born January 1893 in New Jersey
William L Lucas - born Aug 1894 in New Jersey

In the 1910 census he was with his parents in Waltham, Massachusetts.

1920 census of Hudson, New Jersey:
Household
Francis A Bowen 74y
Jane E Bowen 70y
Lydia T Lowe 48y (widowed daughter)
Francis B Lowe 16y
Laura M Lowe 12y
Mary Schram 26y (unmarried, born in California, no relation to the household shown)
William L Lucas 26y (unmarried, born in New Jersey, a cousin of the head of household)

1930 census of West Orange, Essex, New Jersey
Household
William Lucas 35 (born in New Jersey, parents also)
Mary S Lucas 36 (born in California, mother also, father born in Iowa)
child Mary A Lucas 8 (born in New Jersey)