Last official estimated population of Carroll County was 20,828 (year 2014)[1]. This was 0.007% of total US population and 0.7% of total Iowa state population. Area of Carroll County is 570.3 mi² (=1477 km²), in this year population density was 36.52 p/mi². If population growth rate would be same as in period 2010-2014 (+0.01%/yr), Carroll County population in 2024 would be 20,858 [0].
Historical population of Carroll 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] +24.18 %/yr
[1870-1880] +17.55 %/yr
[1880-1890] +4.31 %/yr
[1890-1900] +0.77 %/yr
[1900-1910] -0.1 %/yr
[1910-1920] +0.69 %/yr
[1920-1930] +0.35 %/yr
[1930-1940] +0.2 %/yr
[1940-1950] +0.13 %/yr
[1950-1960] +0.16 %/yr
[1960-1970] -0.22 %/yr
[1970-1980] +0.02 %/yr
[1980-1990] -0.69 %/yr
[1990-2000] +0 %/yr
[2000-2005] -0.43 %/yr
[2005-2010] -0.15 %/yr
[2010-2014] +0.01 %/yr
Looking for settlements in Carroll County? Visit this page: Settlements in Carroll County, IA
Population of Carroll County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 636 | 697 | 1,333 |
| 5 to 9 | 742 | 698 | 1,440 |
| 10 to 14 | 669 | 671 | 1,340 |
| 15 to 19 | 676 | 598 | 1,274 |
| 20 to 24 | 553 | 573 | 1,126 |
| 25 to 29 | 496 | 509 | 1,005 |
| 30 to 34 | 599 | 548 | 1,147 |
| 35 to 39 | 562 | 544 | 1,106 |
| 40 to 44 | 536 | 550 | 1,086 |
| 45 to 49 | 634 | 611 | 1,245 |
| 50 to 54 | 775 | 766 | 1,541 |
| 55 to 59 | 811 | 796 | 1,607 |
| 60 to 64 | 682 | 679 | 1,361 |
| 65 to 69 | 466 | 498 | 964 |
| 70 to 74 | 353 | 437 | 790 |
| 75 to 79 | 325 | 401 | 726 |
| 80 to 84 | 249 | 415 | 664 |
| 85+ | 238 | 569 | 807 |
Carroll 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 | 9832 | 10393 | 20,225 |
| NH | 9775 | 10317 | 20,092 |
| WA | 9733 | 10308 | 20,041 |
| NHWAC | 9628 | 10175 | 19,803 |
| NHWA | 9531 | 10100 | 19,631 |
| H | 227 | 243 | 470 |
| HWAC | 204 | 218 | 422 |
| HWA | 202 | 208 | 410 |
| BAC | 153 | 122 | 275 |
| NHBAC | 142 | 110 | 252 |
| TOM | 100 | 90 | 190 |
| NHTOM | 98 | 80 | 178 |
| BA | 97 | 73 | 170 |
| NHBA | 86 | 65 | 151 |
| AAC | 66 | 77 | 143 |
| NHAAC | 65 | 75 | 140 |
| IAC | 51 | 53 | 104 |
| AA | 45 | 59 | 104 |
| NHAA | 44 | 57 | 101 |
| NHIAC | 39 | 34 | 73 |
| IA | 26 | 27 | 53 |
| HIAC | 12 | 19 | 31 |
| NHIA | 16 | 14 | 30 |
| HBAC | 11 | 12 | 23 |
| HIA | 10 | 13 | 23 |
| HBA | 11 | 8 | 19 |
| NAC | 7 | 9 | 16 |
| NHNAC | 6 | 7 | 13 |
| HTOM | 2 | 10 | 12 |
| NA | 1 | 3 | 4 |
| HNAC | 1 | 2 | 3 |
| HNA | 1 | 2 | 3 |
| HAAC | 1 | 2 | 3 |
| HAA | 1 | 2 | 3 |
| NHNA | 0 | 1 | 1 |
• Webster County population
44.7 mi, 
52°
• Boone County
47.7 mi, 
90°
• Crawford County
26.8 mi, 
270°
• Shelby County
33.7 mi, 
222°
• Guthrie County
31 mi, 
142°
• Sac County
26.9 mi, 
333°
• Calhoun County
26.6 mi, 
25°
• Greene County
24.6 mi, 89°
• Ida County
40.8 mi, 
306°
• Audubon County
25 mi, 
184°
[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
*Pottawattamie Iowa Notes
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