Somonauk is a village in DeKalb County and LaSalle counties in the U.S. state of Illinois. The population was 1,295 at the 2000 census. A special census in 2008 set the population at 1,832.

The DeKalb County portion of Somonauk is part of the Chicago?Naperville?Joliet Metropolitan Statistical Area, while the small portion that lies in LaSalle County is part of the Ottawa?Streator Micropolitan Statistical Area.

The village of Somonauk is served by Somonauk Community Unit School District (CUSD) #432 and offers grades K-12. The school's athletic teams are known as the Bobcats. School colors are blue and gold. The school district's website can be found at: http://www.somonauk.net/ The school's song is titled "Somonauk Loyalty", and is a basic spin-off of the University of Illinois' fight song, named "Illinois Loyalty".

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Click here to view Somonauk Public Library