Last official estimated population of Miami County was 102,456 (year 2014)[1]. This was 0.032% of total US population and 0.9% of total Ohio state population. Area of Miami County is 409.7 mi² (=1061 km²), in this year population density was 250.10 p/mi². If population growth rate would be same as in period 2010-2014 (-0.01%/yr), Miami County population in 2024 would be 102,331 [0].
Historical population of Miami 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] +8.43 %/yr
[1820-1830] +3.76 %/yr
[1830-1840] +4.39 %/yr
[1840-1850] +2.42 %/yr
[1850-1860] +1.83 %/yr
[1860-1870] +0.89 %/yr
[1870-1880] +1 %/yr
[1880-1890] +0.95 %/yr
[1890-1900] +0.81 %/yr
[1900-1910] +0.44 %/yr
[1910-1920] +0.73 %/yr
[1920-1930] +0.58 %/yr
[1930-1940] +0.26 %/yr
[1940-1950] +1.54 %/yr
[1950-1960] +1.75 %/yr
[1960-1970] +1.47 %/yr
[1970-1980] +0.69 %/yr
[1980-1990] +0.31 %/yr
[1990-2000] +0.6 %/yr
[2000-2005] +0.53 %/yr
[2005-2010] +0.18 %/yr
[2010-2014] -0.01 %/yr
Looking for settlements in Miami County? Visit this page: Settlements in Miami County, OH
Population of Miami County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 3050 | 2830 | 5,880 |
| 5 to 9 | 3502 | 3222 | 6,724 |
| 10 to 14 | 3605 | 3583 | 7,188 |
| 15 to 19 | 3419 | 3078 | 6,497 |
| 20 to 24 | 2959 | 2808 | 5,767 |
| 25 to 29 | 3042 | 2879 | 5,921 |
| 30 to 34 | 3040 | 3032 | 6,072 |
| 35 to 39 | 2973 | 2978 | 5,951 |
| 40 to 44 | 3389 | 3465 | 6,854 |
| 45 to 49 | 3491 | 3360 | 6,851 |
| 50 to 54 | 3744 | 3964 | 7,708 |
| 55 to 59 | 3803 | 3968 | 7,771 |
| 60 to 64 | 3267 | 3482 | 6,749 |
| 65 to 69 | 2837 | 3108 | 5,945 |
| 70 to 74 | 2081 | 2331 | 4,412 |
| 75 to 79 | 1476 | 1808 | 3,284 |
| 80 to 84 | 895 | 1258 | 2,153 |
| 85+ | 730 | 1443 | 2,173 |
Miami 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 | 50485 | 51821 | 102,306 |
| WAC | 49173 | 50586 | 99,759 |
| NHWAC | 48443 | 49867 | 98,310 |
| WA | 48286 | 49698 | 97,984 |
| NHWA | 47585 | 49015 | 96,600 |
| BAC | 1860 | 1636 | 3,496 |
| NHBAC | 1815 | 1582 | 3,397 |
| BA | 1277 | 1047 | 2,324 |
| NHBA | 1249 | 1016 | 2,265 |
| TOM | 922 | 924 | 1,846 |
| NHTOM | 891 | 887 | 1,778 |
| AAC | 795 | 943 | 1,738 |
| NHAAC | 782 | 928 | 1,710 |
| H | 818 | 776 | 1,594 |
| HWAC | 730 | 719 | 1,449 |
| AA | 647 | 801 | 1,448 |
| NHAA | 638 | 790 | 1,428 |
| HWA | 701 | 683 | 1,384 |
| IAC | 391 | 337 | 728 |
| NHIAC | 327 | 313 | 640 |
| IA | 156 | 113 | 269 |
| NHIA | 108 | 101 | 209 |
| HBAC | 45 | 54 | 99 |
| HIAC | 64 | 24 | 88 |
| NAC | 37 | 44 | 81 |
| NHNAC | 35 | 41 | 76 |
| HTOM | 31 | 37 | 68 |
| HIA | 48 | 12 | 60 |
| HBA | 28 | 31 | 59 |
| NA | 15 | 14 | 29 |
| HAAC | 13 | 15 | 28 |
| NHNA | 14 | 12 | 26 |
| HAA | 9 | 11 | 20 |
| HNAC | 2 | 3 | 5 |
| HNA | 1 | 2 | 3 |
• Montgomery County population
21 mi, 
189°
• Greene County
30.8 mi, 
145°
• Clark County
25.4 mi, 
111°
• Darke County
21.5 mi, 
284°
• Shelby County
19.6 mi, 
3°
• Auglaize County
35.1 mi, 0°
• Logan County
33.6 mi, 
46°
• Preble County
31 mi, 
225°
• Mercer County
39.5 mi, 
327°
• Champaign County
25 mi, 
77°
[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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