frr.wikipedia.orgCook County (Illinois) – Wikipedia Cook County uun Illinois Cook County as en county uun de US-ameerikoons bundesstoot Illinois. At county leit uun a nuurduast faan a bundesstoot. Det hee 5.275.541 lidj (2020)[1]. At hoodsteed faan't county as Chicago. ↑ Illinois: State in USA, citypopulation.de