Walter Francis Dillingham was the oldest son of Benjamin "B. F." Dillingham and Emma Smith Dillingham of Honolulu. B. F. Dillingham
was an influential and successful businessman in Hawaii and owner of several companies including the Olaa Sugar Company, the
Ewa Plantation, and the B. F. Dillingham Company. In 1888, B. F. created the Oahu Railway and Land Company, ultimately building
the first railroad on the island of Oahu. Walter, born in Honolulu, April 5, 1875, moved to the United States, in 1889, to
attend Newton High School in Auburndale, Massachusetts, and later Harvard University. After returning home from Harvard, Walter
began clerking for his father, and in 1900, at the age of 25, became manager of the Dowsett Company, Limited. He also created
and was the first manager and treasurer of the Hawaiian Dredging Company. In 1904, with his father hospitalized in San Francisco,
Walter became responsible for the finances and direction of the Oahu Railway and Land Company. In 1910 Walter married Louise
Olga Gaylord; they had four children, Lowell Smith, Benjamin Franklin II, Henry Gaylord and Elizabeth Louise Dillingham Wick.
In 1918, after B. F.'s death, Walter, along with his brother Harold Garfield Dillingham, took over the management of the Dillinghams'
businesses. Walter was stationed in Washington, D. C., and served in the U. S. Army, Motor Transport Corps during World War
I. Walter F. Dillingham died in Hawaii in October 1963.