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| collar counties (The collar counties are the five counties of Illinois that border on Chicago's Cook County. The collar counties (DuPage, Kane, Lake, McHenry, and Will) are tied to Chicago economically, but, like many suburban areas in the United States, have very different political leanings than does the core city. Chicago has long been a Democratic stronghold, and the collar counties are known for being historically Republican strongholds. 4uzhoj) | |||