Mr. Darling was a member of the American Society of civil Engineers and of the Duluth Section of that society, fellow of the American Association for the Advancement of Science; member of the American Astronomical Society; member of the Astronomical Society of the Pacific; member of the Sons of the American Revolution, member of the St. Louis County Historical Society and member of its Board of Governors. The honorary degree of Doctor of Engineering was conferred by the University of Michigan in 1915. He was elected to the Duluth Hall of Fame in February 1930.