Kendall leads the County with the highest growth rate(96,818), but Will is the fastest growing large county(673,586).
Cook County Continues Decline
Meanwhile, unique to the Chicagoland, Cook County continues to leak population.

Tags: Boone, Chicago, Cook, County, Dekalb, Dupage, Grundy, Kane, Kankakee, Kenall, Lake, McHenry, population growth, US Census bureau, Will