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Counties in Illinois, United States

County Name Population Water Area
Percentage 		Land Area
Percentage
Adams County, IL 68,277  1.68%  98.32% 
Alexander County, IL 9,590  6.4%  93.6% 
Bond County, IL 17,633  0.64%  99.35% 
Boone County, IL 41,786  0.24%  99.76% 
Brown County, IL 6,950  0.52%  99.48% 
Bureau County, IL 35,503  0.54%  99.46% 
Calhoun County, IL 5,084  10.53%  89.47% 
Carroll County, IL 16,674  4.63%  95.37% 
Cass County, IL 13,695  2.04%  97.96% 
Champaign County, IL 179,669  0.07%  99.93% 
Christian County, IL 35,372  0.93%  99.07% 
Clark County, IL 17,008  0.67%  99.33% 
Clay County, IL 14,560  0.13%  99.87% 
Clinton County, IL 35,535  5.81%  94.19% 
Coles County, IL 53,196  0.35%  99.65% 
Cook County, IL 5,376,741  42.16%  57.84% 
Crawford County, IL 20,452  0.49%  99.5% 
Cumberland County, IL 11,253  0.28%  99.72% 
De Witt County, IL 16,798  1.87%  98.13% 
DeKalb County, IL 88,969  0.13%  99.87% 
Douglas County, IL 19,922  0.13%  99.87% 
DuPage County, IL 904,161  0.88%  99.13% 
Edgar County, IL 19,704  0.1%  99.9% 
Edwards County, IL 6,971  0.14%  99.86% 
Effingham County, IL 34,264  0.25%  99.75% 
Fayette County, IL 21,802  1.22%  98.78% 
Ford County, IL 14,241  0.11%  99.89% 
Franklin County, IL 39,018  4.48%  95.52% 
Fulton County, IL 38,250  1.92%  98.08% 
Gallatin County, IL 6,445  1.43%  98.57% 
Greene County, IL 14,761  0.59%  99.41% 
Grundy County, IL 37,535  2.44%  97.56% 
Hamilton County, IL 8,621  0.15%  99.84% 
Hancock County, IL 20,121  2.45%  97.55% 
Hardin County, IL 4,800  1.76%  98.24% 
Henderson County, IL 8,213  4.13%  95.87% 
Henry County, IL 51,020  0.29%  99.71% 
Iroquois County, IL 31,334  0.14%  99.86% 
Jackson County, IL 59,612  2.39%  97.61% 
Jasper County, IL 10,117  0.73%  99.27% 
Jefferson County, IL 40,045  2.19%  97.82% 
Jersey County, IL 21,668  2.08%  97.92% 
Jo Daviess County, IL 22,289  2.85%  97.15% 
Johnson County, IL 12,878  1.22%  98.78% 
Kane County, IL 404,119  0.69%  99.31% 
Kankakee County, IL 103,833  0.69%  99.31% 
Kendall County, IL 54,544  0.65%  99.35% 
Knox County, IL 55,836  0.48%  99.52% 
La Salle County, IL 111,509  1.14%  98.86% 
Lake County, IL 644,356  67.28%  32.72% 
Lawrence County, IL 15,452  0.52%  99.48% 
Lee County, IL 36,062  0.54%  99.46% 
Livingston County, IL 39,678  0.16%  99.84% 
Logan County, IL 31,183  0.14%  99.86% 
Macon County, IL 114,706  0.83%  99.17% 
Macoupin County, IL 49,019  0.47%  99.53% 
Madison County, IL 258,941  2.07%  97.93% 
Marion County, IL 41,691  0.6%  99.4% 
Marshall County, IL 13,180  3.12%  96.87% 
Mason County, IL 16,038  4.34%  95.66% 
Massac County, IL 15,161  1.26%  98.73% 
McDonough County, IL 32,913  0.13%  99.87% 
McHenry County, IL 260,077  1.25%  98.75% 
McLean County, IL 150,433  0.23%  99.77% 
Menard County, IL 12,486  0.36%  99.64% 
Mercer County, IL 16,957  1.38%  98.62% 
Monroe County, IL 27,619  2.37%  97.63% 
Montgomery County, IL 30,652  0.84%  99.16% 
Morgan County, IL 36,616  0.61%  99.39% 
Moultrie County, IL 14,287  2.57%  97.43% 
Ogle County, IL 51,032  0.58%  99.42% 
Peoria County, IL 183,433  1.8%  98.2% 
Perry County, IL 23,094  1.31%  98.69% 
Piatt County, IL 16,365  0.07%  99.93% 
Pike County, IL 17,384  2.19%  97.81% 
Pope County, IL 4,413  1.01%  98.99% 
Pulaski County, IL 7,348  1.25%  98.75% 
Putnam County, IL 6,086  7.23%  92.78% 
Randolph County, IL 33,893  3.15%  96.85% 
Richland County, IL 16,149  0.52%  99.48% 
Rock Island County, IL 149,374  5.41%  94.59% 
Saline County, IL 26,733  0.95%  99.05% 
Sangamon County, IL 188,951  1.01%  98.99% 
Schuyler County, IL 7,189  0.92%  99.08% 
Scott County, IL 5,537  0.73%  99.27% 
Shelby County, IL 22,893  1.24%  98.76% 
St. Clair County, IL 256,082  1.51%  98.5% 
Stark County, IL 6,332  0.1%  99.91% 
Stephenson County, IL 48,979  0.1%  99.9% 
Tazewell County, IL 128,485  1.37%  98.63% 
Union County, IL 18,293  1.41%  98.59% 
Vermilion County, IL 83,919  0.34%  99.66% 
Wabash County, IL 12,937  1.88%  98.12% 
Warren County, IL 18,735  0.12%  99.88% 
Washington County, IL 15,148  0.27%  99.73% 
Wayne County, IL 17,151  0.23%  99.77% 
White County, IL 15,371  1.36%  98.64% 
Whiteside County, IL 60,653  1.76%  98.24% 
Will County, IL 502,266  1.47%  98.53% 
Williamson County, IL 61,296  4.72%  95.28% 
Winnebago County, IL 278,418  1.07%  98.94% 
Woodford County, IL 35,469  2.73%  97.27% 


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Official Site of Illinois
State Population: 12,880,580
Illinois Counties
 Natural Resource Office
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