Last official estimated population of Iowa County was 16,320 (year 2014)[1]. This was 0.005% of total US population and 0.5% of total Iowa state population. Area of Iowa County is 587.5 mi² (=1521.6 km²), in this year population density was 27.78 p/mi². If population growth rate would be same as in period 2010-2014 (-0.05%/yr), Iowa County population in 2024 would be 16,233 [0].
Historical population of Iowa 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] +25.6 %/yr
[1860-1870] +7.56 %/yr
[1870-1880] +1.45 %/yr
[1880-1890] -0.51 %/yr
[1890-1900] +0.68 %/yr
[1900-1910] -0.6 %/yr
[1910-1920] +0.1 %/yr
[1920-1930] -0.7 %/yr
[1930-1940] -0.18 %/yr
[1940-1950] -0.72 %/yr
[1950-1960] +0.35 %/yr
[1960-1970] -0.61 %/yr
[1970-1980] +0.01 %/yr
[1980-1990] -0.53 %/yr
[1990-2000] +0.7 %/yr
[2000-2005] +0.77 %/yr
[2005-2010] +0.07 %/yr
[2010-2014] -0.05 %/yr
Looking for settlements in Iowa County? Visit this page: Settlements in Iowa County, IA
Population of Iowa County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 506 | 460 | 966 |
| 5 to 9 | 557 | 518 | 1,075 |
| 10 to 14 | 554 | 531 | 1,085 |
| 15 to 19 | 543 | 528 | 1,071 |
| 20 to 24 | 436 | 416 | 852 |
| 25 to 29 | 380 | 396 | 776 |
| 30 to 34 | 500 | 459 | 959 |
| 35 to 39 | 466 | 452 | 918 |
| 40 to 44 | 462 | 483 | 945 |
| 45 to 49 | 548 | 530 | 1,078 |
| 50 to 54 | 662 | 646 | 1,308 |
| 55 to 59 | 676 | 646 | 1,322 |
| 60 to 64 | 568 | 507 | 1,075 |
| 65 to 69 | 377 | 379 | 756 |
| 70 to 74 | 285 | 333 | 618 |
| 75 to 79 | 252 | 328 | 580 |
| 80 to 84 | 170 | 282 | 452 |
| 85+ | 170 | 369 | 539 |
Iowa 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 | 8000 | 8150 | 16,150 |
| WA | 7937 | 8094 | 16,031 |
| NH | 7898 | 8074 | 15,972 |
| NHWAC | 7806 | 7974 | 15,780 |
| NHWA | 7749 | 7926 | 15,675 |
| H | 214 | 189 | 403 |
| HWAC | 194 | 176 | 370 |
| HWA | 188 | 168 | 356 |
| BAC | 86 | 86 | 172 |
| NHBAC | 73 | 81 | 154 |
| TOM | 69 | 57 | 126 |
| NHTOM | 62 | 49 | 111 |
| BA | 54 | 57 | 111 |
| NHBA | 45 | 53 | 98 |
| IAC | 49 | 43 | 92 |
| AAC | 42 | 43 | 85 |
| NHAAC | 41 | 41 | 82 |
| AA | 33 | 37 | 70 |
| NHAA | 33 | 35 | 68 |
| NHIAC | 36 | 29 | 65 |
| IA | 17 | 18 | 35 |
| HIAC | 13 | 14 | 27 |
| HBAC | 13 | 5 | 18 |
| NHIA | 7 | 11 | 18 |
| HIA | 10 | 7 | 17 |
| HTOM | 7 | 8 | 15 |
| HBA | 9 | 4 | 13 |
| NAC | 5 | 0 | 5 |
| NHNAC | 5 | 0 | 5 |
| HAAC | 1 | 2 | 3 |
| NHNA | 2 | 0 | 2 |
| NA | 2 | 0 | 2 |
| HAA | 0 | 2 | 2 |
| HNAC | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
• Linn County population
36.1 mi, 
41°
• Johnson County
24.3 mi, 
92°
• Benton County
28.2 mi, 
0°
• Mahaska County
38.6 mi, 
230°
• Washington County
30 mi, 
144°
• Poweshiek County
23.9 mi, 
270°
• Cedar County
48.2 mi, 
82°
• Tama County
36.3 mi, 
318°
• Jefferson County
47 mi, 
174°
• Keokuk County
25 mi, 
192°
[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
*Johnson Iowa Notes
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