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Will County is a county located in the northern part of the U.S. state of Illinois. This county is part of the Chicago metropolitan area. As of 2000, the population was 502,266. In 2009, the estimated population was 685,251, making it one of the fastest growing counties in the United States. The county seat of Will County is Joliet, Illinois. The portion of Will County around Joliet uses the 815 and 779 area codes, 630 and 331 area code for far northern Will County, and 708 area code for eastern Will County.
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