what are the biggest cities in illinois?
Chicago
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 = = = = Midwest : Illinois and Michigan = = = = 

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 Illinois 

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 Illinois 

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 Illinois : Iowa , Wisconsin 

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 The site is bordered on the southeast by the Tri @-@ Cities , a metropolitan area composed of Richland , Kennewick , Pasco , and smaller communities , and home to over 230 @,@ 000 residents . Hanford is a primary economic base for these cities . 
