Last official estimated population of Miami County was 36,795 (year 2014)[1]. This was 0.012% of total US population and 0.6% of total Indiana state population. Area of Miami County is 377.4 mi² (=977.4 km²), in this year population density was 97.50 p/mi². If population growth rate would be same as in period 2010-2014 (-0.07%/yr), Miami County population in 2021 would be 36,607 [0].
Historical population of Miami 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] +14 %/yr
[1850-1860] +4.07 %/yr
[1860-1870] +2.25 %/yr
[1870-1880] +1.35 %/yr
[1880-1890] +0.7 %/yr
[1890-1900] +0.94 %/yr
[1900-1910] +0.35 %/yr
[1910-1920] -0.23 %/yr
[1920-1930] +0.13 %/yr
[1930-1940] -0.39 %/yr
[1940-1950] +0.1 %/yr
[1950-1960] +3.03 %/yr
[1960-1970] +0.32 %/yr
[1970-1980] +0.15 %/yr
[1980-1990] -0.76 %/yr
[1990-2000] -0.22 %/yr
[2000-2005] +0.74 %/yr
[2005-2010] -0.29 %/yr
[2010-2014] -0.07 %/yr
Looking for settlements in Miami County? Visit this page: Settlements in Miami County, IN
Population of Miami County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 922 | 897 | 1,819 |
| 5 to 9 | 1128 | 1049 | 2,177 |
| 10 to 14 | 1223 | 1111 | 2,334 |
| 15 to 19 | 1146 | 1082 | 2,228 |
| 20 to 24 | 1355 | 951 | 2,306 |
| 25 to 29 | 1375 | 871 | 2,246 |
| 30 to 34 | 1369 | 867 | 2,236 |
| 35 to 39 | 1424 | 1002 | 2,426 |
| 40 to 44 | 1436 | 1057 | 2,493 |
| 45 to 49 | 1384 | 1079 | 2,463 |
| 50 to 54 | 1478 | 1264 | 2,742 |
| 55 to 59 | 1303 | 1202 | 2,505 |
| 60 to 64 | 1163 | 1108 | 2,271 |
| 65 to 69 | 974 | 979 | 1,953 |
| 70 to 74 | 658 | 738 | 1,396 |
| 75 to 79 | 446 | 528 | 974 |
| 80 to 84 | 290 | 402 | 692 |
| 85+ | 246 | 447 | 693 |
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 | 18684 | 16246 | 34,930 |
| WAC | 17599 | 16125 | 33,724 |
| WA | 17274 | 15790 | 33,064 |
| NHWAC | 17008 | 15774 | 32,782 |
| NHWA | 16710 | 15461 | 32,171 |
| BAC | 1625 | 423 | 2,048 |
| NHBAC | 1594 | 398 | 1,992 |
| BA | 1471 | 246 | 1,717 |
| NHBA | 1449 | 228 | 1,677 |
| H | 636 | 388 | 1,024 |
| HWAC | 591 | 351 | 942 |
| HWA | 564 | 329 | 893 |
| TOM | 333 | 348 | 681 |
| NHTOM | 306 | 325 | 631 |
| IAC | 325 | 302 | 627 |
| NHIAC | 287 | 274 | 561 |
| IA | 174 | 160 | 334 |
| NHIA | 153 | 146 | 299 |
| AAC | 104 | 127 | 231 |
| NHAAC | 101 | 122 | 223 |
| AA | 63 | 81 | 144 |
| NHAA | 62 | 80 | 142 |
| HIAC | 38 | 28 | 66 |
| HBAC | 31 | 25 | 56 |
| HTOM | 27 | 23 | 50 |
| HBA | 22 | 18 | 40 |
| HIA | 21 | 14 | 35 |
| NAC | 11 | 17 | 28 |
| NHNAC | 9 | 13 | 22 |
| NA | 5 | 9 | 14 |
| NHNA | 4 | 6 | 10 |
| HAAC | 3 | 5 | 8 |
| HNAC | 2 | 4 | 6 |
| HNA | 1 | 3 | 4 |
| HAA | 1 | 1 | 2 |
• Howard County population
20.3 mi, 
190°
• Kosciusko County
33.9 mi, 
16°
• Grant County
27.1 mi, 
131°
• Cass County
16.3 mi, 
265°
• Huntington County
29.8 mi, 
82°
• Whitley County
37.8 mi, 
48°
• Wabash County
13.9 mi, 
69°
• Fulton County
22.4 mi, 
328°
• Carroll County
30.2 mi, 
244°
• Tipton County
32 mi, 
181°
[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
*Cass Indiana Notes
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