DeKalb is a city in DeKalb County, Illinois, United States. The population was 40,290 at the 2020 census. The city is named after decorated Fr…DeKalb is a city in DeKalb County, Illinois, United States. The population was 40,290 at the 2020 census. The city is named after decorated Franconian-French war hero Johann de Kalb, who died during the American Revolutionary War.
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