sentences:  The prominent financiers and industrialists Jacob Bunn and John Whitfield Bunn were based in Springfield, Sangamon County, Illinois, as well as in Chicago, during the nineteenth century and the early twentieth century.The careers of these men and the people with whom they collaborated helped to shape much of the history and development of Sangamon County, Illinois.According to the U.S. Census Bureau, the county has a total area of , of which is land and (1.0%) is water.