Last official estimated population of Montgomery County was 30,095 (year 2014)[1]. This was 0.009% of total US population and 0.2% of total Illinois state population. Area of Montgomery County is 709.7 mi² (=1838.1 km²), in this year population density was 42.41 p/mi². If population growth rate would be same as in period 2010-2014 (-0.01%/yr), Montgomery County population in 2024 would be 30,073 [0].
Historical population of Montgomery County for period 1830-2014 [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
[1830-1840] +4.28 %/yr
[1840-1850] +3.41 %/yr
[1850-1860] +8.34 %/yr
[1860-1870] +6.12 %/yr
[1870-1880] +1.04 %/yr
[1880-1890] +0.67 %/yr
[1890-1900] +0.27 %/yr
[1900-1910] +1.36 %/yr
[1910-1920] +1.6 %/yr
[1920-1930] -1.59 %/yr
[1930-1940] -0.22 %/yr
[1940-1950] -0.61 %/yr
[1950-1960] -0.38 %/yr
[1960-1970] -0.32 %/yr
[1970-1980] +0.46 %/yr
[1980-1990] -0.31 %/yr
[1990-2000] -0.03 %/yr
[2000-2005] -0.23 %/yr
[2005-2010] -0.12 %/yr
[2010-2014] -0.01 %/yr
Looking for settlements in Montgomery County? Visit this page: Settlements in Montgomery County, IL
Population of Montgomery County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 735 | 765 | 1,500 |
| 5 to 9 | 930 | 806 | 1,736 |
| 10 to 14 | 908 | 850 | 1,758 |
| 15 to 19 | 865 | 776 | 1,641 |
| 20 to 24 | 1068 | 742 | 1,810 |
| 25 to 29 | 1053 | 695 | 1,748 |
| 30 to 34 | 1098 | 835 | 1,933 |
| 35 to 39 | 941 | 742 | 1,683 |
| 40 to 44 | 1072 | 757 | 1,829 |
| 45 to 49 | 1069 | 915 | 1,984 |
| 50 to 54 | 1160 | 1099 | 2,259 |
| 55 to 59 | 1117 | 1030 | 2,147 |
| 60 to 64 | 967 | 948 | 1,915 |
| 65 to 69 | 752 | 769 | 1,521 |
| 70 to 74 | 573 | 634 | 1,207 |
| 75 to 79 | 433 | 550 | 983 |
| 80 to 84 | 297 | 456 | 753 |
| 85+ | 317 | 635 | 952 |
Montgomery 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 | 15042 | 13825 | 28,867 |
| WAC | 14344 | 13825 | 28,169 |
| WA | 14240 | 13704 | 27,944 |
| NHWAC | 14046 | 13651 | 27,697 |
| NHWA | 13948 | 13537 | 27,485 |
| BAC | 974 | 153 | 1,127 |
| NHBAC | 966 | 147 | 1,113 |
| BA | 911 | 79 | 990 |
| NHBA | 905 | 76 | 981 |
| H | 313 | 179 | 492 |
| HWAC | 298 | 174 | 472 |
| HWA | 292 | 167 | 459 |
| TOM | 111 | 129 | 240 |
| NHTOM | 105 | 122 | 227 |
| AAC | 75 | 85 | 160 |
| NHAAC | 71 | 85 | 156 |
| IAC | 65 | 64 | 129 |
| AA | 54 | 60 | 114 |
| NHIAC | 55 | 58 | 113 |
| NHAA | 52 | 60 | 112 |
| IA | 32 | 28 | 60 |
| NHIA | 25 | 26 | 51 |
| NAC | 11 | 9 | 20 |
| NHNAC | 11 | 9 | 20 |
| HIAC | 10 | 6 | 16 |
| HBAC | 8 | 6 | 14 |
| HTOM | 6 | 7 | 13 |
| NA | 7 | 4 | 11 |
| NHNA | 7 | 4 | 11 |
| HIA | 7 | 2 | 9 |
| HBA | 6 | 3 | 9 |
| HAAC | 4 | 0 | 4 |
| HAA | 2 | 0 | 2 |
| HNAC | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
• Madison County population
35.8 mi, 
219°
• Sangamon County
37.9 mi, 
344°
• Macoupin County
24.1 mi, 
276°
• Clinton County
43.1 mi, 
176°
• Christian County
24.4 mi, 
25°
• Effingham County
49 mi, 
104°
• Jersey County
48.4 mi, 
257°
• Shelby County
37.9 mi, 
73°
• Fayette County
29.2 mi, 
122°
• Bond County
23.7 mi, 
174°
[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
*Bond, Madison Illinois Notes
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