Last official estimated population of Jasper County was 36,805 (year 2014)[1]. This was 0.012% of total US population and 1.2% of total Iowa state population. Area of Jasper County is 733.0 mi² (=1898.3 km²), in this year population density was 50.21 p/mi². If population growth rate would be same as in period 2010-2014 (-0.03%/yr), Jasper County population in 2024 would be 36,713 [0].
Historical population of Jasper 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] +22.68 %/yr
[1860-1870] +8.39 %/yr
[1870-1880] +1.62 %/yr
[1880-1890] -0.4 %/yr
[1890-1900] +0.79 %/yr
[1900-1910] +0.02 %/yr
[1910-1920] +0.3 %/yr
[1920-1930] +1.69 %/yr
[1930-1940] -0.45 %/yr
[1940-1950] +0.25 %/yr
[1950-1960] +0.89 %/yr
[1960-1970] +0.04 %/yr
[1970-1980] +0.28 %/yr
[1980-1990] -0.46 %/yr
[1990-2000] +0.68 %/yr
[2000-2005] +0.14 %/yr
[2005-2010] -0.34 %/yr
[2010-2014] -0.03 %/yr
Looking for settlements in Jasper County? Visit this page: Settlements in Jasper County, IA
Population of Jasper County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1012 | 1013 | 2,025 |
| 5 to 9 | 1205 | 1180 | 2,385 |
| 10 to 14 | 1261 | 1213 | 2,474 |
| 15 to 19 | 1149 | 1015 | 2,164 |
| 20 to 24 | 1123 | 871 | 1,994 |
| 25 to 29 | 1145 | 900 | 2,045 |
| 30 to 34 | 1282 | 1075 | 2,357 |
| 35 to 39 | 1191 | 956 | 2,147 |
| 40 to 44 | 1247 | 1026 | 2,273 |
| 45 to 49 | 1250 | 1174 | 2,424 |
| 50 to 54 | 1466 | 1408 | 2,874 |
| 55 to 59 | 1440 | 1350 | 2,790 |
| 60 to 64 | 1133 | 1156 | 2,289 |
| 65 to 69 | 997 | 1030 | 2,027 |
| 70 to 74 | 692 | 765 | 1,457 |
| 75 to 79 | 504 | 663 | 1,167 |
| 80 to 84 | 367 | 536 | 903 |
| 85+ | 347 | 730 | 1,077 |
Jasper 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 | 18430 | 17741 | 36,171 |
| WAC | 18065 | 17697 | 35,762 |
| WA | 17917 | 17498 | 35,415 |
| NHWAC | 17700 | 17391 | 35,091 |
| NHWA | 17571 | 17211 | 34,782 |
| BAC | 606 | 245 | 851 |
| NHBAC | 593 | 233 | 826 |
| BA | 544 | 163 | 707 |
| H | 381 | 320 | 701 |
| NHBA | 535 | 156 | 691 |
| HWAC | 365 | 306 | 671 |
| HWA | 346 | 287 | 633 |
| TOM | 160 | 206 | 366 |
| NHTOM | 139 | 186 | 325 |
| AAC | 153 | 165 | 318 |
| NHAAC | 148 | 163 | 311 |
| IAC | 140 | 154 | 294 |
| NHIAC | 121 | 135 | 256 |
| NHAA | 116 | 114 | 230 |
| AA | 116 | 114 | 230 |
| IA | 70 | 76 | 146 |
| NHIA | 65 | 70 | 135 |
| HTOM | 21 | 20 | 41 |
| HIAC | 19 | 19 | 38 |
| HBAC | 13 | 12 | 25 |
| NAC | 12 | 10 | 22 |
| NHNAC | 12 | 9 | 21 |
| HBA | 9 | 7 | 16 |
| HIA | 5 | 6 | 11 |
| NA | 4 | 4 | 8 |
| NHNA | 4 | 4 | 8 |
| HAAC | 5 | 2 | 7 |
| HNAC | 0 | 1 | 1 |
| HNA | 0 | 0 | 0 |
| HAA | 0 | 0 | 0 |
• Polk County population
26.6 mi, 
269°
• Story County
32.3 mi, 
318°
• Warren County
35.7 mi, 
227°
• Marshall County
24.9 mi, 
8°
• Marion County
24.6 mi, 
184°
• Mahaska County
32.7 mi, 
138°
• Poweshiek County
27.4 mi, 
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• Tama County
38.1 mi, 
45°
• Lucas County
47.3 mi, 
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• Monroe County
46.4 mi, 
168°
[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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