Last official estimated population of Hardin County was 17,531 (year 2014)[1]. This was 0.005% of total US population and 0.6% of total Iowa state population. Area of Hardin County is 570.0 mi² (=1476.3 km²), in this year population density was 30.76 p/mi². If population growth rate would be same as in period 2010-2014 (-0%/yr), Hardin County population in 2026 would be 17,522 [0].
Historical population of Hardin County for period 1860-2014 [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
[1860-1870] +9.66 %/yr
[1870-1880] +2.67 %/yr
[1880-1890] +0.65 %/yr
[1890-1900] +1.84 %/yr
[1900-1910] -0.85 %/yr
[1910-1920] +1.1 %/yr
[1920-1930] -0.17 %/yr
[1930-1940] -0.18 %/yr
[1940-1950] -0.14 %/yr
[1950-1960] +0.14 %/yr
[1960-1970] -0.13 %/yr
[1970-1980] -0.21 %/yr
[1980-1990] -1.31 %/yr
[1990-2000] -0.15 %/yr
[2000-2005] -0.9 %/yr
[2005-2010] -0.49 %/yr
[2010-2014] -0 %/yr
Looking for settlements in Hardin County? Visit this page: Settlements in Hardin County, IA
Population of Hardin County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 447 | 445 | 892 |
| 5 to 9 | 492 | 497 | 989 |
| 10 to 14 | 504 | 507 | 1,011 |
| 15 to 19 | 807 | 523 | 1,330 |
| 20 to 24 | 567 | 464 | 1,031 |
| 25 to 29 | 420 | 396 | 816 |
| 30 to 34 | 476 | 477 | 953 |
| 35 to 39 | 454 | 431 | 885 |
| 40 to 44 | 528 | 419 | 947 |
| 45 to 49 | 471 | 510 | 981 |
| 50 to 54 | 606 | 654 | 1,260 |
| 55 to 59 | 722 | 647 | 1,369 |
| 60 to 64 | 611 | 561 | 1,172 |
| 65 to 69 | 436 | 474 | 910 |
| 70 to 74 | 360 | 453 | 813 |
| 75 to 79 | 282 | 380 | 662 |
| 80 to 84 | 226 | 336 | 562 |
| 85+ | 255 | 473 | 728 |
Hardin 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 |
| WAC | 8352 | 8521 | 16,873 |
| WA | 8227 | 8443 | 16,670 |
| NH | 8247 | 8355 | 16,602 |
| NHWAC | 7967 | 8247 | 16,214 |
| NHWA | 7859 | 8174 | 16,033 |
| H | 417 | 292 | 709 |
| HWAC | 385 | 274 | 659 |
| HWA | 368 | 269 | 637 |
| BAC | 275 | 78 | 353 |
| NHBAC | 262 | 72 | 334 |
| BA | 217 | 44 | 261 |
| NHBA | 209 | 39 | 248 |
| TOM | 136 | 81 | 217 |
| NHTOM | 119 | 76 | 195 |
| IAC | 88 | 61 | 149 |
| AAC | 78 | 65 | 143 |
| NHAAC | 67 | 61 | 128 |
| NHIAC | 62 | 50 | 112 |
| AA | 50 | 51 | 101 |
| NHAA | 40 | 47 | 87 |
| IA | 29 | 25 | 54 |
| HIAC | 26 | 11 | 37 |
| NHIA | 16 | 18 | 34 |
| HTOM | 17 | 5 | 22 |
| HIA | 13 | 7 | 20 |
| HBAC | 13 | 6 | 19 |
| NAC | 12 | 5 | 17 |
| HAAC | 11 | 4 | 15 |
| HAA | 10 | 4 | 14 |
| NHNAC | 10 | 3 | 13 |
| HBA | 8 | 5 | 13 |
| NA | 5 | 3 | 8 |
| NHNA | 4 | 1 | 5 |
| HNAC | 2 | 2 | 4 |
| HNA | 1 | 2 | 3 |
• Story County population
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47.3 mi, 
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• Marshall County
27.5 mi, 
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• Boone County
43.1 mi, 
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• Tama County
42.5 mi, 
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• Hamilton County
23.9 mi, 
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• Butler County
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• Wright County
34.5 mi, 
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• Grundy County
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• Franklin County
24 mi, 356°
[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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