"Marshall County"@en . "1.00233e+09"^^ . "2.9"^^ . "12.7414"^^ . . . . "1839-01-19Z"^^ . . "1.03341e+09"^^ . . . "3.10799e+07"^^ . "12640"^^ . "Marshall County is a county located in the U.S. state of Illinois. According to the 2010 census, it had a population of 12,640. Its county seat is Lacon.Marshall County is part of the Peoria, IL Metropolitan Statistical Area."@en . . "2010Z"^^ .