Last official estimated population of Montgomery County was 536,175 (year 2014)[1]. This was 0.168% of total US population and 4.6% of total Ohio state population. Area of Montgomery County is 464.3 mi² (=1202.6 km²), in this year population density was 1,154.71 p/mi². If population growth rate would be same as in period 2010-2014 (+0.05%/yr), Montgomery County population in 2024 would be 538,739 [0].
Historical population of Montgomery County for period 1810-2014 [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
[1810-1820] +7.56 %/yr
[1820-1830] +4.29 %/yr
[1830-1840] +2.74 %/yr
[1840-1850] +1.81 %/yr
[1850-1860] +3.17 %/yr
[1860-1870] +2.05 %/yr
[1870-1880] +2.07 %/yr
[1880-1890] +2.53 %/yr
[1890-1900] +2.58 %/yr
[1900-1910] +2.32 %/yr
[1910-1920] +2.5 %/yr
[1920-1930] +2.7 %/yr
[1930-1940] +0.78 %/yr
[1940-1950] +3.03 %/yr
[1950-1960] +2.84 %/yr
[1960-1970] +1.41 %/yr
[1970-1980] -0.58 %/yr
[1980-1990] +0.04 %/yr
[1990-2000] -0.26 %/yr
[2000-2005] -0.44 %/yr
[2005-2010] -0.44 %/yr
[2010-2014] +0.05 %/yr
Looking for settlements in Montgomery County? Visit this page: Settlements in Montgomery County, OH
Population of Montgomery County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 16695 | 16175 | 32,870 |
| 5 to 9 | 16848 | 16093 | 32,941 |
| 10 to 14 | 17198 | 16368 | 33,566 |
| 15 to 19 | 17310 | 16537 | 33,847 |
| 20 to 24 | 18303 | 18722 | 37,025 |
| 25 to 29 | 17688 | 17966 | 35,654 |
| 30 to 34 | 16574 | 17362 | 33,936 |
| 35 to 39 | 14551 | 15269 | 29,820 |
| 40 to 44 | 15310 | 16309 | 31,619 |
| 45 to 49 | 16239 | 17273 | 33,512 |
| 50 to 54 | 18667 | 19607 | 38,274 |
| 55 to 59 | 18162 | 19852 | 38,014 |
| 60 to 64 | 15647 | 17785 | 33,432 |
| 65 to 69 | 12675 | 15239 | 27,914 |
| 70 to 74 | 8977 | 11233 | 20,210 |
| 75 to 79 | 6544 | 9017 | 15,561 |
| 80 to 84 | 4720 | 7117 | 11,837 |
| 85+ | 4302 | 8782 | 13,084 |
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 | 249393 | 269913 | 519,306 |
| WAC | 197650 | 209120 | 406,770 |
| NHWAC | 191564 | 203339 | 394,903 |
| WA | 191916 | 202678 | 394,594 |
| NHWA | 186209 | 197306 | 383,515 |
| BAC | 56299 | 64761 | 121,060 |
| NHBAC | 55374 | 63766 | 119,140 |
| BA | 52320 | 60235 | 112,555 |
| NHBA | 51668 | 59528 | 111,196 |
| AAC | 6722 | 7636 | 14,358 |
| NHAAC | 6545 | 7452 | 13,997 |
| H | 7017 | 6793 | 13,810 |
| TOM | 6243 | 7061 | 13,304 |
| NHTOM | 5822 | 6607 | 12,429 |
| HWAC | 6086 | 5781 | 11,867 |
| HWA | 5707 | 5372 | 11,079 |
| AA | 5145 | 5934 | 11,079 |
| NHAA | 5067 | 5843 | 10,910 |
| IAC | 2373 | 2706 | 5,079 |
| NHIAC | 2051 | 2360 | 4,411 |
| HBAC | 925 | 995 | 1,920 |
| HBA | 652 | 707 | 1,359 |
| IA | 676 | 644 | 1,320 |
| NHIA | 535 | 510 | 1,045 |
| HTOM | 421 | 454 | 875 |
| HIAC | 322 | 346 | 668 |
| NAC | 283 | 350 | 633 |
| NHNAC | 233 | 277 | 510 |
| HAAC | 177 | 184 | 361 |
| HIA | 141 | 134 | 275 |
| NA | 110 | 154 | 264 |
| NHNA | 92 | 119 | 211 |
| HAA | 78 | 91 | 169 |
| HNAC | 50 | 73 | 123 |
| HNA | 18 | 35 | 53 |
• Butler County population
26.2 mi, 
214°
• Warren County
23.6 mi, 
164°
• Greene County
21.5 mi, 
102°
• Clark County
29.2 mi, 
67°
• Miami County
21 mi, 
9°
• Darke County
31.4 mi, 
326°
• Preble County
18.8 mi, 
266°
• Clinton County
34.6 mi, 
130°
• Champaign County
38.1 mi, 
46°
• Union County
34.9 mi, 
255°
[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
*Hamilton Ohio Notes
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