Last official estimated population of Mahaska County was 22,397 (year 2014)[1]. This was 0.007% of total US population and 0.7% of total Iowa state population. Area of Mahaska County is 573.4 mi² (=1485.1 km²), in this year population density was 39.06 p/mi². If population growth rate would be same as in period 2010-2014 (+0.02%/yr), Mahaska County population in 2024 would be 22,437 [0].
Historical population of Mahaska County for period 1850-2014 [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
[1850-1860] +9.48 %/yr
[1860-1870] +4.27 %/yr
[1870-1880] +1.14 %/yr
[1880-1890] +1.35 %/yr
[1890-1900] +1.75 %/yr
[1900-1910] -1.37 %/yr
[1910-1920] -1.27 %/yr
[1920-1930] -0.18 %/yr
[1930-1940] +0.26 %/yr
[1940-1950] -0.71 %/yr
[1950-1960] -0.44 %/yr
[1960-1970] -0.62 %/yr
[1970-1980] +0.31 %/yr
[1980-1990] -0.6 %/yr
[1990-2000] +0.36 %/yr
[2000-2005] +0.12 %/yr
[2005-2010] -0.07 %/yr
[2010-2014] +0.02 %/yr
Looking for settlements in Mahaska County? Visit this page: Settlements in Mahaska County, IA
Population of Mahaska County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 712 | 651 | 1,363 |
| 5 to 9 | 815 | 684 | 1,499 |
| 10 to 14 | 808 | 709 | 1,517 |
| 15 to 19 | 829 | 739 | 1,568 |
| 20 to 24 | 821 | 697 | 1,518 |
| 25 to 29 | 649 | 634 | 1,283 |
| 30 to 34 | 689 | 641 | 1,330 |
| 35 to 39 | 652 | 665 | 1,317 |
| 40 to 44 | 628 | 615 | 1,243 |
| 45 to 49 | 666 | 661 | 1,327 |
| 50 to 54 | 799 | 764 | 1,563 |
| 55 to 59 | 816 | 772 | 1,588 |
| 60 to 64 | 756 | 717 | 1,473 |
| 65 to 69 | 520 | 566 | 1,086 |
| 70 to 74 | 381 | 471 | 852 |
| 75 to 79 | 331 | 345 | 676 |
| 80 to 84 | 183 | 309 | 492 |
| 85+ | 216 | 459 | 675 |
Mahaska 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 | 11049 | 10899 | 21,948 |
| WAC | 10869 | 10834 | 21,703 |
| WA | 10746 | 10715 | 21,461 |
| NHWAC | 10667 | 10654 | 21,321 |
| NHWA | 10554 | 10542 | 21,096 |
| H | 222 | 200 | 422 |
| BAC | 269 | 134 | 403 |
| NHBAC | 265 | 132 | 397 |
| HWAC | 202 | 180 | 382 |
| HWA | 192 | 173 | 365 |
| AAC | 166 | 162 | 328 |
| NHAAC | 164 | 154 | 318 |
| BA | 204 | 83 | 287 |
| NHBA | 202 | 83 | 285 |
| AA | 137 | 137 | 274 |
| NHAA | 136 | 130 | 266 |
| TOM | 125 | 121 | 246 |
| NHTOM | 115 | 114 | 229 |
| IAC | 87 | 80 | 167 |
| NHIAC | 64 | 64 | 128 |
| IA | 54 | 37 | 91 |
| NHIA | 37 | 24 | 61 |
| HIAC | 23 | 16 | 39 |
| HIA | 17 | 13 | 30 |
| NAC | 9 | 11 | 20 |
| HTOM | 10 | 7 | 17 |
| NHNAC | 7 | 10 | 17 |
| NHNA | 5 | 6 | 11 |
| NA | 5 | 6 | 11 |
| HAAC | 2 | 8 | 10 |
| HAA | 1 | 7 | 8 |
| HBAC | 4 | 2 | 6 |
| HNAC | 2 | 1 | 3 |
| HBA | 2 | 0 | 2 |
| HNA | 0 | 0 | 0 |
• Jasper County population
32.7 mi, 
318°
• Wapello County
23.8 mi, 
150°
• Marion County
23.7 mi, 
270°
• Poweshiek County
25.1 mi, 
13°
• Jefferson County
41.4 mi, 
122°
• Iowa County
38.6 mi, 
50°
• Keokuk County
24.3 mi, 
89°
• Lucas County
41.6 mi, 
240°
• Davis County
41.9 mi, 
163°
• Monroe County
24.1 mi, 
210°
[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
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