|Winnebago County Illinois Cities/Towns -
Cherry Valley, Durand, Lake Summerset, Loves Park, Machesney Park, New Millford, Owen Center, Pecatonica, Rockford (County Seat), Rockton, Roscoe, Seward, Shirland, South Beloit, Winnebago
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Winnebago County is a county located in the U.S. state of Illinois. As of 2000, the population was 278,418. Its county seat is Rockford.
Winnebago County was formed in 1836. It was named for the Winnebago Tribe of Native Americans.