Population of Counties in Illinois (2017)

Name 2017 Population Growth Rate
Cook County5,203,4990.08%
DuPage County929,3681.22%
Lake County703,047-0.18%
Will County689,5291.56%
Kane County531,7153.04%
McHenry County307,004-0.68%
Winnebago County285,873-3.13%
Madison County265,759-1.35%
St. Clair County262,759-2.82%
Champaign County208,4193.44%
Sangamon County197,499-0.15%
Peoria County185,006-0.65%
McLean County172,4181.51%
Rock Island County144,784-1.93%
Tazewell County134,385-0.81%
Kendall County124,6958.07%
LaSalle County110,642-2.80%
Kankakee County110,008-3.03%
Macon County106,550-3.82%
DeKalb County104,528-0.62%
Vermilion County78,111-4.30%
Williamson County67,5601.69%
Adams County66,578-0.86%
Jackson County58,870-2.50%
Whiteside County56,536-3.35%
Boone County53,503-1.15%
Coles County52,343-2.88%
Ogle County51,273-4.06%
Knox County50,938-3.77%
Grundy County50,4370.63%
Henry County49,280-2.32%
Macoupin County45,908-3.94%
Stephenson County45,624-4.27%
Franklin County39,156-2.19%
Woodford County39,1401.25%
Jefferson County38,460-0.78%
Marion County38,140-3.32%
Clinton County37,729-0.26%
Livingston County36,526-6.04%
Fulton County35,536-4.10%
Effingham County34,3860.47%
Morgan County34,277-3.50%
Lee County34,251-4.68%
Monroe County34,0683.21%
Bureau County33,359-4.48%
Christian County33,309-4.24%
Randolph County32,621-2.50%
McDonough County30,996-4.94%
Logan County29,527-2.47%
Montgomery County28,952-3.78%
Iroquois County28,334-4.53%
Saline County24,307-2.51%
Jersey County22,025-4.10%
Fayette County21,789-1.55%
Jo Daviess County21,770-3.88%
Shelby County21,717-2.88%
Perry County21,357-4.35%
Douglas County19,630-1.63%
Crawford County19,308-2.53%
Hancock County18,508-3.02%
Edgar County17,566-5.10%
Warren County17,378-1.89%
Union County17,212-3.01%
Bond County16,824-5.33%
Piatt County16,560-0.98%
Wayne County16,396-2.10%
Lawrence County16,377-3.25%
De Witt County16,226-2.18%
Pike County15,950-2.66%
Clark County15,938-2.21%
Richland County15,930-1.76%
Mercer County15,730-4.17%
Moultrie County14,827-0.21%
Massac County14,658-4.87%
Carroll County14,539-5.48%
White County14,292-2.18%
Washington County14,154-3.71%
Ford County13,575-3.57%
Mason County13,507-7.81%
Clay County13,300-3.70%
Greene County13,093-5.68%
Johnson County12,9022.32%
Cass County12,676-7.01%
Menard County12,516-1.50%
Marshall County11,939-5.43%
Wabash County11,492-3.49%
Cumberland County10,858-1.71%
Jasper County9,536-1.77%
Hamilton County8,061-4.63%
Schuyler County6,923-8.21%
Henderson County6,869-6.31%
Brown County6,762-2.18%
Edwards County6,523-3.05%
Alexander County6,478-21.13%
Stark County5,776-3.23%
Pulaski County5,619-8.40%
Putnam County5,611-6.47%
Gallatin County5,212-6.70%
Scott County5,053-5.29%
Calhoun County4,894-3.68%
Pope County4,157-6.69%
Hardin County4,024-6.53%