Somonauk is a village in DeKalb and LaSalle Counties in the U.S. state of Illinois. The population was 1,893 at the 2010 Census.
The DeKalb County portion of Somonauk is part of the Chicago-Naperville-Elgin, IL-IN-WI Metropolitan Statistical Area, while the small portion that lies in LaSalle County is part of the Ottawa–Peru, IL Micropolitan Statistical Area.
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