From 1880 to 1902, he was financial officer and superintendent of the Boys' Industrial School of Ohio. From 1902 to 1909 he was superintendent of the New York Juvenile Asylum (now Children's Village), becoming president of this institution. He was Assistant Secretary of the United States Treasury in 1909, but resigned in 1911 to become private secretary to U. S. President William H. Taft where he served until 1912. 
He then served as chairman of the Republican National Committee from 1912-16. He was a New York delegate to the Republican National Conventions of 1916, 1920, 1924, 1928, 1932 and 1940. He served as a regular member of the RNC from New York 1924-38. In 1933 he was a delegate to the New York convention to ratify the 21st Amendment which ended prohibition.
In 1949 Hilles suffered a stroke and died two months later in Speonk, New York. His wife also died the same year. His remains were cremated.
- Reynolds, Francis J., ed. (1921). . Collier's New Encyclopedia. New York: P.F. Collier & Son Company.
- Media related to Charles D. Hilles at Wikimedia Commons
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William R. Wilcox
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