Population of Counties in Illinois (2019)

Name 2019 Population Growth Since 2010
Cook County5,180,493-0.36%
DuPage County928,5891.15%
Lake County700,832-0.48%
Will County692,3101.99%
Kane County534,2163.50%
McHenry County308,570-0.16%
Winnebago County284,081-3.73%
Madison County264,461-1.81%
St. Clair County261,059-3.43%
Champaign County209,9834.19%
Sangamon County195,348-1.22%
Peoria County180,621-3.01%
McLean County172,8281.78%
Rock Island County143,477-2.80%
Tazewell County132,328-2.33%
Kendall County127,91510.87%
Kankakee County110,024-2.99%
LaSalle County109,430-3.85%
Macon County104,712-5.48%
DeKalb County104,143-0.95%
Vermilion County76,806-5.92%
Williamson County67,0560.94%
Adams County65,691-2.19%
Jackson County57,419-4.90%
Whiteside County55,626-4.88%
Boone County53,577-0.97%
Grundy County50,9721.64%
Ogle County50,923-4.68%
Coles County50,885-5.54%
Knox County50,112-5.29%
Henry County49,090-2.70%
Macoupin County45,313-5.20%
Stephenson County44,753-5.99%
Franklin County38,701-3.33%
Woodford County38,463-0.54%
Jefferson County37,820-2.42%
Clinton County37,639-0.53%
Marion County37,620-4.56%
Livingston County35,761-7.97%
Fulton County34,844-6.01%
Monroe County34,3354.05%
Lee County34,223-4.87%
Effingham County34,208-0.04%
Morgan County33,976-4.31%
Bureau County32,993-5.62%
Christian County32,661-6.05%
Randolph County32,106-4.06%
McDonough County29,955-8.19%
Logan County28,925-4.49%
Montgomery County28,601-4.96%
Iroquois County27,604-7.06%
Saline County23,906-4.00%
Jersey County21,847-4.89%
Shelby County21,741-2.76%
Fayette County21,416-3.23%
Jo Daviess County21,366-5.66%
Perry County21,174-5.11%
Douglas County19,479-2.52%
Crawford County18,807-5.02%
Hancock County17,844-6.53%
Edgar County17,360-6.20%
Warren County17,032-3.88%
Union County16,841-5.04%
Bond County16,630-6.50%
Piatt County16,396-1.87%
Wayne County16,332-2.43%
De Witt County15,769-4.95%
Lawrence County15,765-6.94%
Richland County15,763-2.66%
Pike County15,611-4.78%
Mercer County15,601-4.93%
Clark County15,596-4.27%
Moultrie County14,717-0.96%
Carroll County14,312-7.02%
Massac County14,080-8.45%
Washington County13,995-4.87%
White County13,665-6.40%
Mason County13,565-7.41%
Ford County13,264-5.80%
Clay County13,253-4.15%
Greene County13,044-6.09%
Johnson County12,456-1.21%
Menard County12,288-3.21%
Cass County12,260-10.10%
Wabash County11,549-3.08%
Marshall County11,534-8.67%
Cumberland County10,808-2.22%
Jasper County9,611-1.17%
Hamilton County8,163-3.35%
Schuyler County6,907-8.33%
Henderson County6,709-8.63%
Brown County6,556-5.25%
Edwards County6,392-5.08%
Alexander County6,060-26.15%
Putnam County5,740-4.52%
Pulaski County5,463-10.76%
Stark County5,427-9.10%
Gallatin County5,058-9.26%
Scott County4,926-7.53%
Calhoun County4,802-5.77%
Pope County4,212-5.77%
Hardin County3,910-9.45%