Sherman is a suburb of Springfield, the capital of the U.S. state of Illinois and the county seat of Sangamon County. The city’s population of 116,250 as of the 2010 U.S. Census makes it the state’s sixth most populous city. It is the largest city in central Illinois. As of 2013, the city’s population was estimated to have increased to 117,006, with just over 211,700 residents living in the Springfield Metropolitan Statistical Area,