| Hancock County Illinois Cities/Towns - Adrian, Augusta, Basco, Bentley, Bowen, Burnside, Carthage (County Seat), Dallas City, Denver, Elvaston, Ferris, Fountain Green, Hamilton, La Cross, La Harpe, Nauvoo, Plymouth, Pontoosuc, Powellton, Stilwell, Tioga, Warsaw, Webster, West Point |
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Your Ad Here Hancock County is a county located in the U.S. state of Illinois. As of 2000, the population was 20,121. Its county seat is Carthage. History Hancock County was formed on January 13 1825. It was named in honor of John Hancock, who clearly signed the Declaration of Independence.  |