Washington Births, 1891-1907 about L. de W. Barnum. Name: L. de W. Barnum; Date of Birth: 15 Sep 1896; Gender: Male; County: King; Father's Name: T. L. Barnum, 31, W, Printer, b. New York; Mother's Name: Lydia A. Cheesman, 28, W, b. California.
World War I Draft Registration Cards, 1917-1918 about Lyndon De Wolfe Barnum. Name: Lyndon De Wolfe Barnum; City: Seattle; County: King; State: Washington; Birthplace: Washington of America; Birth Date: 15 Sep 1896; Roll: 1991895; DraftBoard: 7; Age: 21; Occupation: Employee of Great Northern Express Company; Nearest Relative: Florence M. Barnum (wife); Height/Build: Short/Medium; Color of Eyes/Hair: Blue Dark brown.
In the 1920 US Census for District 311; Seattle; King County; Washington the family of Lyndon D. Barnum was enumerated as follows:
5223 Graham Street
Dwelling #4; Family #4
Barnum, Lynden [sic] D.; Head; Rents non-farm home; M; W; 23; Married; Can read and write; b. Washington; Father b. New York; Mother b. California; Speaks English; Longshoreman; Docks; Wage earner
Barnum, Florence M.; Wife; F; W; 23; Married Can read and write; b. Washington; Father b. Nova Scotia; Mother b. New Jersey; Speaks English; No occupation
Barnum, Barbara; Daughter; F; W; 3/13; Single; b. Washington; Both parents b. Washington; No occupation
Lyndon died relatively young after contracting polio from a little girl who had fallen in the roadway. He picked her up and carried her out of the road and in less than a month he died. That occurred in either 1924 or 1925, in Seattle, Washington.