McDonough County, Illinois

McDonough County: County in Illinois, United States


McDonough County is a county located in the U.S. state of Illinois. As of the 2010 census, the population was 32,612 and a population density of 21 people per km². After 10 years in 2020 county had an estimated population of 29,295 inhabitants. Its county seat is Macomb. The county was created 197 years ago in 1825.

McDonough County locator map
Location of McDonough County on Illinois map.

Quick Facts about McDonough County

Population : 29,295 (2020)
Country : United States of America
State : Illinois (United States)
Area : 1528 km2
Water as percent of area : 0.1%
Land as percent of area : 99.9%
Named for : Thomas Macdonough
Altitude : 699 feet / 213 meters
Capital : Macomb
Establishment : January 01, 1826
Time Zone : America/Chicago
Local time : 06:25:56 (5th December 2023)
Density : 19 Pop. per km² as of 2020
Population growth : -11.32% (2010-2020)
McDonough County Courthouse image
McDonough County Courthouse
McDonough County Courthouse image


McDonough County is located at 40°27'22"N 90°40'40"W (40.4562100, -90.6779100). It has 5 neighbors: Fulton County, Hancock County, Henderson County, Schuyler County and Warren County.

McDonough County map

The largest city of McDonough County is Macomb with a population of 17,206. Other cities include and Colchester population 1,273. See all McDonough County cities & populated places.

McDonough County Populated Places

Cities, towns, neighborhoods & other populated places in McDonough County.

City Name Population Title
Macomb 17,206 City in and the county seat of McDonough County, Illinois, United States
Bushnell 2,825 Town in Florida, United States
Colchester 1,273 City in McDonough County, Illinois, United States
Walnut Grove 714 Township in McDonough County, Illinois
Blandinsville 586 Township in McDonough County, Illinois
Industry 432 Village in Illinois, US
Good Hope 361 Village in United States of America
Prairie City 344 Township in McDonough County, Illinois
Bardolph 227 Village in the United States
Tennessee 106 Village in Illinois, United States

McDonough County has 5 neighbours.


According to census records, the population of McDonough County decreased by 11.32% in 10 years.

Year Population % Change Method
2010 32,612 - census
2011 32,521 -0.28% estimation process
2012 32,558 0.11% estimation process
2013 32,253 -0.95% estimation process
2014 31,799 -1.43% estimation process
2015 31,449 -1.11% estimation process
2016 30,907 -1.75% estimation process
2017 30,373 -1.76% estimation process
2018 29,984 -1.3% estimation process
2019 29,682 -1.02% estimation process
2020 29,295 -1.32% estimation process

Comitatul McDonough, Comte de McDonough, Comté de McDonough, Condado de McDonough, Condado han McDonough, Contea di McDonough, Hrabstwo McDonough, MakDono srjan, Makdono, Makduna, McDonough, McDonough Comitatus, McDonough Kun, McDonough Kūn, McDonough konderria, McDonough megye, Okrug Makdona, Quan McDonough, Quận McDonough, mai ke duo nuo xian, makudonau jun, mqatʿt mkdwna, myakadanaugha ka'unti, Макдоно, Макдъна, Округ Макдона, ՄակԴոնո շրջան, مقاطعة مكدونا, مکڈونوغ کاؤنٹی, مکڈونوف کاؤنٹی، الینوائے, ম্যাকডনৌঘ কাউন্টি, マクドナウ郡, 麥克多諾縣

People born in McDonough County (5)

People born in McDonough County, including politician Richard P. Myers, politician L. L. Westfall, mathematician Clara Latimer Bacon, .


  • Ira Lawrence Hill (American photographer) he was born in 24/12/1880
  • Samuel James Clarke (American publisher) he was born in 17/03/1842

Illinois Other Counties (more counties)

County Name Population Title
Cook County 5,108,284 County in Illinois, United States
Chicago 2,677,643 The third most populous city in the United States and the center of the Chicago metropolitan area.
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
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 The second most populous city in Illinois.
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
Naperville 147,986 The second most populous city in Illinois.