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Kane County Illinois Last Updated: 11/06/2025 |
| Kane County is a county located in the U.S. state of Illinois. As of the 2020 census, the county had a population of 516,522. The county seat is Geneva, and the largest city is Aurora. Kane County's most prominent natural feature is the Fox River. | |
| The headwaters of the Fox River are located in southern Wisconsin and flow through a rocky riverbed from Clinton to a distance below the southern boundary of the Kane River into Kendall County. | |