Last official estimated population of Montgomery County was 12,238 (year 2014)[1]. This was 0.004% of total US population and 0.2% of total Missouri state population. Area of Montgomery County is 540.5 mi² (=1399.9 km²), in this year population density was 22.64 p/mi². If population growth rate would be same as in period 2010-2014 (+0%/yr), Montgomery County population in 2024 would be 12,243 [0].
Historical population of Montgomery County for period 1820-2014 [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
[1820-1830] +2.41 %/yr
[1830-1840] +1.14 %/yr
[1840-1850] +2.3 %/yr
[1850-1860] +5.88 %/yr
[1860-1870] +0.69 %/yr
[1870-1880] +4.56 %/yr
[1880-1890] +0.36 %/yr
[1890-1900] -0.17 %/yr
[1900-1910] -0.6 %/yr
[1910-1920] -0.24 %/yr
[1920-1930] -1.56 %/yr
[1930-1940] -0.45 %/yr
[1940-1950] -0.74 %/yr
[1950-1960] -0.4 %/yr
[1960-1970] -0.09 %/yr
[1970-1980] +0.48 %/yr
[1980-1990] -0.16 %/yr
[1990-2000] +0.67 %/yr
[2000-2005] +0.24 %/yr
[2005-2010] -0.08 %/yr
[2010-2014] +0 %/yr
Looking for settlements in Montgomery County? Visit this page: Settlements in Montgomery County, MO
Population of Montgomery County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 340 | 366 | 706 |
| 5 to 9 | 420 | 365 | 785 |
| 10 to 14 | 390 | 356 | 746 |
| 15 to 19 | 370 | 316 | 686 |
| 20 to 24 | 313 | 305 | 618 |
| 25 to 29 | 330 | 304 | 634 |
| 30 to 34 | 324 | 314 | 638 |
| 35 to 39 | 301 | 326 | 627 |
| 40 to 44 | 334 | 311 | 645 |
| 45 to 49 | 382 | 356 | 738 |
| 50 to 54 | 459 | 467 | 926 |
| 55 to 59 | 455 | 455 | 910 |
| 60 to 64 | 446 | 391 | 837 |
| 65 to 69 | 304 | 339 | 643 |
| 70 to 74 | 301 | 316 | 617 |
| 75 to 79 | 181 | 214 | 395 |
| 80 to 84 | 136 | 179 | 315 |
| 85+ | 119 | 256 | 375 |
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 | 5780 | 5866 | 11,646 |
| WAC | 5747 | 5802 | 11,549 |
| WA | 5670 | 5712 | 11,382 |
| NHWAC | 5635 | 5741 | 11,376 |
| NHWA | 5562 | 5654 | 11,216 |
| BAC | 159 | 103 | 262 |
| NHBAC | 148 | 101 | 249 |
| H | 125 | 70 | 195 |
| BA | 120 | 68 | 188 |
| NHBA | 112 | 67 | 179 |
| TOM | 81 | 94 | 175 |
| HWAC | 112 | 61 | 173 |
| NHTOM | 77 | 90 | 167 |
| HWA | 108 | 58 | 166 |
| IAC | 54 | 71 | 125 |
| NHIAC | 49 | 61 | 110 |
| AAC | 24 | 51 | 75 |
| NHAAC | 24 | 50 | 74 |
| AA | 14 | 39 | 53 |
| NHAA | 14 | 39 | 53 |
| IA | 17 | 22 | 39 |
| NHIA | 13 | 15 | 28 |
| HIAC | 5 | 10 | 15 |
| HBAC | 11 | 2 | 13 |
| NAC | 6 | 5 | 11 |
| HIA | 4 | 7 | 11 |
| NHNAC | 5 | 5 | 10 |
| HBA | 8 | 1 | 9 |
| HTOM | 4 | 4 | 8 |
| NA | 3 | 1 | 4 |
| NHNA | 2 | 1 | 3 |
| HNAC | 1 | 0 | 1 |
| HNA | 1 | 0 | 1 |
| HAAC | 0 | 1 | 1 |
| HAA | 0 | 0 | 0 |
• St. Charles County population
43.8 mi, 
104°
• Franklin County
42.1 mi, 
149°
• Lincoln County
28.4 mi, 
71°
• Callaway County
25.6 mi, 
254°
• Warren County
20.4 mi, 
126°
• Audrain County
28 mi, 
313°
• Pike County
32.1 mi, 
29°
• Gasconade County
34.2 mi, 
183°
• Osage County
38.9 mi, 
213°
• Ralls County
42.8 mi, 
355°
[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
*St. Charles Missouri Notes
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