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Cook County, Illinois
Cook County
is a
county
in the
United States state
of
Illinois
. As of 2014, the population was 5,246,456. With more than 40 percent of all Illinois residents, it is the most populous county in Illinois and the
second-most populous
county in the United States after
Los Angeles County, California
. Its
county seat
is
Chicago
, the largest city in Illinois and
third-most populous
city in the United States.
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