Last official estimated population of McDonough County was 32,596 (year 2014)[1]. This was 0.01% of total US population and 0.3% of total Illinois state population. Area of McDonough County is 590.2 mi² (=1528.6 km²), in this year population density was 55.23 p/mi². If population growth rate would be same as in period 2010-2014 (-0.01%/yr), McDonough County population in 2026 would be 32,548 [0].
Historical population of McDonough County for period 1840-2014 [1] , [2] , [3]:
Estimated population for 2014[1]. Population density is in p./sq.mi [4]. Changes are for period 2010-2015. Value is %/year. Boundary lines are approx. 2012 [5]. Click on flag to hide it.
Population • Density • Changes • Legends • Position

[1840-1850] +3.68 %/yr
[1850-1860] +10.17 %/yr
[1860-1870] +2.82 %/yr
[1870-1880] +0.54 %/yr
[1880-1890] -0.18 %/yr
[1890-1900] +0.34 %/yr
[1900-1910] -0.55 %/yr
[1910-1920] +0.07 %/yr
[1920-1930] +0.09 %/yr
[1930-1940] -0.14 %/yr
[1940-1950] +0.46 %/yr
[1950-1960] +0.26 %/yr
[1960-1970] +2.4 %/yr
[1970-1980] +0.22 %/yr
[1980-1990] -0.61 %/yr
[1990-2000] -0.68 %/yr
[2000-2005] -0.04 %/yr
[2005-2010] -0.14 %/yr
[2010-2014] -0.01 %/yr
Looking for settlements in McDonough County? Visit this page: Settlements in McDonough County, IL
Population of McDonough County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 782 | 741 | 1,523 |
| 5 to 9 | 764 | 718 | 1,482 |
| 10 to 14 | 733 | 741 | 1,474 |
| 15 to 19 | 1372 | 1667 | 3,039 |
| 20 to 24 | 3195 | 2735 | 5,930 |
| 25 to 29 | 1230 | 1004 | 2,234 |
| 30 to 34 | 851 | 818 | 1,669 |
| 35 to 39 | 725 | 717 | 1,442 |
| 40 to 44 | 743 | 725 | 1,468 |
| 45 to 49 | 704 | 732 | 1,436 |
| 50 to 54 | 845 | 924 | 1,769 |
| 55 to 59 | 919 | 941 | 1,860 |
| 60 to 64 | 877 | 932 | 1,809 |
| 65 to 69 | 700 | 731 | 1,431 |
| 70 to 74 | 513 | 569 | 1,082 |
| 75 to 79 | 335 | 432 | 767 |
| 80 to 84 | 233 | 388 | 621 |
| 85+ | 254 | 590 | 844 |
McDonough County resident population estimates by Sex, Race, and Hispanic Origin[1b]. For full list of abbrevations see: population.us/about page.
| Race | Male | Female | Total |
| NH | 15337 | 15678 | 31,015 |
| WAC | 14523 | 14800 | 29,323 |
| WA | 14263 | 14533 | 28,796 |
| NHWAC | 14137 | 14444 | 28,581 |
| NHWA | 13897 | 14196 | 28,093 |
| BAC | 976 | 1031 | 2,007 |
| NHBAC | 938 | 977 | 1,915 |
| BA | 843 | 888 | 1,731 |
| NHBA | 817 | 847 | 1,664 |
| H | 438 | 427 | 865 |
| AAC | 431 | 425 | 856 |
| NHAAC | 421 | 408 | 829 |
| HWAC | 386 | 356 | 742 |
| HWA | 366 | 337 | 703 |
| AA | 346 | 341 | 687 |
| NHAA | 340 | 331 | 671 |
| TOM | 280 | 286 | 566 |
| NHTOM | 259 | 263 | 522 |
| IAC | 122 | 127 | 249 |
| NHIAC | 91 | 105 | 196 |
| IA | 43 | 51 | 94 |
| HBAC | 38 | 54 | 92 |
| HBA | 26 | 41 | 67 |
| NHIA | 24 | 37 | 61 |
| HIAC | 31 | 22 | 53 |
| HTOM | 21 | 23 | 44 |
| HIA | 19 | 14 | 33 |
| NAC | 13 | 18 | 31 |
| NHNAC | 13 | 15 | 28 |
| HAAC | 10 | 17 | 27 |
| HAA | 6 | 10 | 16 |
| NA | 0 | 6 | 6 |
| NHNA | 0 | 4 | 4 |
| HNAC | 0 | 3 | 3 |
| HNA | 0 | 2 | 2 |
• Adams County population
42.4 mi,
219°
• Knox County
40.9 mi,
36°
• Des Moines County
41.4 mi,
320°
• Fulton County
25.1 mi,
88°
• Hancock County
25.9 mi,
262°
• Warren County
27.4 mi,
6°
• Cass County
40.7 mi,
145°
• Schuyler County
20.9 mi,
170°
• Henderson County
28.3 mi,
330°
• Brown County
34.3 mi,
186°
[0] Calculated by population.us from last known population growth rate, not official data.
[1] County population - 2014, archived from the original, retrieved 02/23/2016
[1b] Annual County Resident Population Estimates by Age, Sex, Race, and Hispanic Origin, (used only data for 2014) archived from the original, retrieved 02/23/2016
[2] County population - 2000-2010, archived from the original, retrieved 02/23/2016
[3] Population of States and Counties of the United States: 1790 to 1992, PDF, 15 Mb, census.gov, retrieved 02/23/2016
[4] County area, latitude longitude data, retrieved 02/23/2016
[5] County boundaries, CSV files on boundaries.us, retrived 03/18/2016
*Schuyler; see note 6 Illinois Notes
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