State of Illinois by county and population

                                      

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       il.jpg The total population for this region is 3,978,662 The total number of counties in this region is 29 Click for more information. The total population for this region is 1,894,747 The total number of counties in this region is 38 Click for more information. The total population for this region is 1,169,143 The total number of counties in this region is 34 Click for more information. The total population for this region is 5,376,741 The total number of counties in this region is 1 Click for more information.