Last official estimated population of Poweshiek County was 18,902 (year 2014)[1]. This was 0.006% of total US population and 0.6% of total Iowa state population. Area of Poweshiek County is 586.1 mi² (=1517.9 km²), in this year population density was 32.25 p/mi². If population growth rate would be same as in period 2010-2014 (-0.02%/yr), Poweshiek County population in 2024 would be 18,872 [0].
Historical population of Poweshiek 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] +24.87 %/yr
[1860-1870] +10.64 %/yr
[1870-1880] +1.97 %/yr
[1880-1890] -0.29 %/yr
[1890-1900] +0.54 %/yr
[1900-1910] +0.09 %/yr
[1910-1920] +0.16 %/yr
[1920-1930] -0.61 %/yr
[1930-1940] +0.02 %/yr
[1940-1950] +0.31 %/yr
[1950-1960] -0.02 %/yr
[1960-1970] -0.26 %/yr
[1970-1980] +0.26 %/yr
[1980-1990] -0.14 %/yr
[1990-2000] -0.11 %/yr
[2000-2005] +0.18 %/yr
[2005-2010] -0.09 %/yr
[2010-2014] -0.02 %/yr
Looking for settlements in Poweshiek County? Visit this page: Settlements in Poweshiek County, IA
Population of Poweshiek County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 507 | 458 | 965 |
| 5 to 9 | 525 | 534 | 1,059 |
| 10 to 14 | 578 | 510 | 1,088 |
| 15 to 19 | 818 | 805 | 1,623 |
| 20 to 24 | 848 | 909 | 1,757 |
| 25 to 29 | 432 | 451 | 883 |
| 30 to 34 | 458 | 471 | 929 |
| 35 to 39 | 472 | 427 | 899 |
| 40 to 44 | 467 | 468 | 935 |
| 45 to 49 | 550 | 527 | 1,077 |
| 50 to 54 | 646 | 662 | 1,308 |
| 55 to 59 | 667 | 695 | 1,362 |
| 60 to 64 | 593 | 614 | 1,207 |
| 65 to 69 | 502 | 508 | 1,010 |
| 70 to 74 | 364 | 444 | 808 |
| 75 to 79 | 278 | 355 | 633 |
| 80 to 84 | 223 | 286 | 509 |
| 85+ | 196 | 420 | 616 |
Poweshiek 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 | 8835 | 9276 | 18,111 |
| WAC | 8781 | 9167 | 17,948 |
| WA | 8657 | 9033 | 17,690 |
| NHWAC | 8523 | 8921 | 17,444 |
| NHWA | 8416 | 8803 | 17,219 |
| H | 289 | 268 | 557 |
| HWAC | 258 | 246 | 504 |
| HWA | 241 | 230 | 471 |
| AAC | 203 | 256 | 459 |
| NHAAC | 196 | 244 | 440 |
| BAC | 183 | 186 | 369 |
| AA | 148 | 196 | 344 |
| NHBAC | 164 | 171 | 335 |
| NHAA | 145 | 189 | 334 |
| TOM | 133 | 142 | 275 |
| BA | 131 | 139 | 270 |
| NHBA | 120 | 130 | 250 |
| NHTOM | 115 | 124 | 239 |
| IAC | 77 | 77 | 154 |
| NHIAC | 50 | 63 | 113 |
| IA | 36 | 29 | 65 |
| NHIA | 20 | 25 | 45 |
| HIAC | 27 | 14 | 41 |
| HTOM | 18 | 18 | 36 |
| HBAC | 19 | 15 | 34 |
| NAC | 22 | 11 | 33 |
| NHNAC | 22 | 11 | 33 |
| NA | 19 | 5 | 24 |
| NHNA | 19 | 5 | 24 |
| HIA | 16 | 4 | 20 |
| HBA | 11 | 9 | 20 |
| HAAC | 7 | 12 | 19 |
| HAA | 3 | 7 | 10 |
| HNAC | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
• Marshall County population
34.1 mi, 
316°
• Jasper County
27.4 mi, 
270°
• Wapello County
45.5 mi, 
172°
• Marion County
38.3 mi, 
230°
• Benton County
37 mi, 
40°
• Mahaska County
25.1 mi, 
193°
• Washington County
48 mi, 
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• Tama County
27 mi, 
359°
• Iowa County
23.9 mi, 
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• Keokuk County
30.6 mi, 
143°
[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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