Joseph Dorr Clapp (December 31, 1811 – October 27, 1900) was an American banker, Democratic politician, and Wisconsin pioneer. He served two years in the Wisconsin State Senate, representing Jefferson County. In contemporaneous documents he was frequently referred to as J. D. Clapp.
In 1859, he started the Koshkonong Bank in partnership with Lucien B. Caswell. The bank later merged into the First National Bank, and Clapp served as president of the merged bank until his death in 1900.[2] He served in the Wisconsin State Senate for the 1862 and 1863 sessions. His brother was Mark R. Clapp who served in the Wisconsin Territorial Legislature.[3][4]
^'Proceedings of the State Historical Society of Wisconsin at the Forty-eight session, December 11, 1900, Biographical Sketch of Joseph Dorr Clapp, pg. 95
^'The United States Biographical Dictionary and Portrait Gallery of Eminent and Self-made Men,' Wisconsin volume, volume 1, Western Historical Publishing Company, Chicago, Illinois: 1879, Biographical Sketch of Joseph Dorr Clapp, pp. 226–227