Carroll County, Illinois

Carroll County: County in Illinois, United States


Carroll County is a county located in the U.S. state of Illinois. As of the 2010 census, the population was 15,387 and a population density of 13 people per km². After 10 years in 2020 county had an estimated population of 14,241 inhabitants. Its county seat is Mount Carroll. The county was created 183 years ago in 1838.

Quick Facts about Carroll County

Population : 14,241 (2020)
Country : United States of America
State : Illinois (United States)
Different from : Carroll County, Carroll County, Carroll County, Carroll County, Carroll County, Carroll County, Carroll County, Carroll County, Carroll County, Carroll County, Carroll County, Carroll County
Area : 1206 km2
Water as percent of area : 4.6%
Land as percent of area : 95.4%
Named for : Charles Carroll
Capital : Mount Carroll
Establishment : January 01, 1839
Time Zone : America/Chicago
Local time : 20:44:38 (26th November 2022)
Density : 12 Pop. per km² as of 2020
Population growth : -8.05% (2010-2020)
Carroll County locator map
Location of Carroll County on Illinois map.


Carroll County is located at 42°4'7"N 89°56'4"W (42.0686100, -89.9343300). It has 6 neighbors: Clinton County, Jackson County, Jo Daviess County, Ogle County, Stephenson County and Whiteside County.

Carroll County map

The largest city of Carroll County is Blackhawk with a population of 9,587. Other cities include, Mount Carroll population 1,562, Lanark population 1,321, Milledgeville population 946 and Chadwick population 516. See all Carroll County cities & populated places.

Carroll County Populated Places

Cities, Towns, Neighborhoods & Other Populated Places in Carroll County.

City Name Population Title
Blackhawk 9,587 Unincorporated community in Illinois
Savanna 2,777 Town in Illinois
Mount Carroll 1,562 City in Illinois
Lanark 1,321 City in Illinois, United States
Milledgeville 946 Human settlement in Carroll County, Illinois, USA
Shannon 684 Village in Carroll County, Illinois, USA
Thomson 548 Town in Illinois, USA
Chadwick 516 American settlement
Elkhorn Grove 216 Unincorporated community in Illinois

Carroll County has 6 neighbours.


According to census records, the population of Carroll County decreased by 8.05% in 10 years.

Year Population % Change Method
2010 15,387 - census
2011 15,229 -1.04% estimation process
2012 15,121 -0.71% estimation process
2013 14,969 -1.02% estimation process
2014 14,783 -1.26% estimation process
2015 14,642 -0.96% estimation process
2016 14,596 -0.32% estimation process
2017 14,475 -0.84% estimation process
2018 14,314 -1.12% estimation process
2019 14,305 -0.06% estimation process
2020 14,241 -0.45% estimation process

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People born in Carroll County (2)

People born in Carroll County, including politician Willis J. Bailey, nurse Helen Scott Hay, .


Other places with the same name (13)

Illinois Other Counties (more counties)

County Name Population Title
Cook County 5,108,284 County in Illinois, United States
Chicago 2,677,643 City and county seat of Cook County, Illinois, United States
DuPage County 917,481 County in Illinois, United States
Lake County 693,593 County in Oregon, United States
Will County 688,726 County in Illinois, United States
Kane County 531,010 County in southern Utah, United States
Markham 328,966 City in Cook County, Illinois, United States
McHenry County 305,888 County in Illinois, United States
Winnebago County 281,295 County in Illinois, United States
Madison County 262,635 County in Montana, United States
Saint Clair County 258,046 The County of St.
Champaign County 209,192 County in Illinois, United States
Aurora 196,383 City in Kane County, Illinois, United States
Sangamon County 193,882 County in Illinois, United States
Peoria County 177,652 County in Illinois, United States of America
McLean County 171,256 County in North Dakota, United States