Warsaw is a city in Hancock County, Illinois, United States. The population was 1,510 at the 2020 census, a decline from 1,607 in 2010. The cit…Warsaw is a city in Hancock County, Illinois, United States. The population was 1,510 at the 2020 census, a decline from 1,607 in 2010. The city is notable for its historic downtown. The city of Warsaw began in 1814, when young Major Zachary Taylor founded Fort Johnson on the eastern bank of the Mississippi River across from the mouth of the Des Moines River. Fort Johnson was occupied only for a few weeks before it was burned. In 1815 another military camp, Fort Edwards, was built nearby at a different location. Warsaw became an important fur trading post and one of the earliest American settlements in northern Illinois.
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