Last official estimated population of Carroll County was 15,364 (year 2014)[1]. This was 0.005% of total US population and 0.1% of total Illinois state population. Area of Carroll County is 466.6 mi² (=1208.6 km²), in this year population density was 32.93 p/mi². If population growth rate would be same as in period 2010-2014 (-0.04%/yr), Carroll County population in 2024 would be 15,307 [0].
Historical population of Carroll County for period 1840-2014 [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
[1840-1850] +16.19 %/yr
[1850-1860] +9.85 %/yr
[1860-1870] +3.6 %/yr
[1870-1880] +0.16 %/yr
[1880-1890] +0.76 %/yr
[1890-1900] +0.35 %/yr
[1900-1910] -0.5 %/yr
[1910-1920] +0.7 %/yr
[1920-1930] -0.48 %/yr
[1930-1940] -0.24 %/yr
[1940-1950] +0.54 %/yr
[1950-1960] +0.28 %/yr
[1960-1970] -0.12 %/yr
[1970-1980] -0.26 %/yr
[1980-1990] -1.1 %/yr
[1990-2000] -0.08 %/yr
[2000-2005] -0.93 %/yr
[2005-2010] -0.67 %/yr
[2010-2014] -0.04 %/yr
Looking for settlements in Carroll County? Visit this page: Settlements in Carroll County, IL
Population of Carroll County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 332 | 332 | 664 |
| 5 to 9 | 371 | 343 | 714 |
| 10 to 14 | 469 | 396 | 865 |
| 15 to 19 | 434 | 423 | 857 |
| 20 to 24 | 414 | 386 | 800 |
| 25 to 29 | 369 | 308 | 677 |
| 30 to 34 | 378 | 398 | 776 |
| 35 to 39 | 388 | 340 | 728 |
| 40 to 44 | 431 | 408 | 839 |
| 45 to 49 | 399 | 440 | 839 |
| 50 to 54 | 581 | 549 | 1,130 |
| 55 to 59 | 561 | 589 | 1,150 |
| 60 to 64 | 602 | 604 | 1,206 |
| 65 to 69 | 544 | 535 | 1,079 |
| 70 to 74 | 424 | 446 | 870 |
| 75 to 79 | 276 | 296 | 572 |
| 80 to 84 | 199 | 240 | 439 |
| 85+ | 179 | 331 | 510 |
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 | 7184 | 7204 | 14,388 |
| NH | 7103 | 7116 | 14,219 |
| WA | 7097 | 7117 | 14,214 |
| NHWAC | 6948 | 6972 | 13,920 |
| NHWA | 6874 | 6902 | 13,776 |
| H | 248 | 248 | 496 |
| HWAC | 236 | 232 | 468 |
| HWA | 223 | 215 | 438 |
| BAC | 141 | 114 | 255 |
| NHBAC | 132 | 104 | 236 |
| TOM | 91 | 95 | 186 |
| BA | 98 | 66 | 164 |
| NHBA | 96 | 64 | 160 |
| NHTOM | 78 | 78 | 156 |
| AAC | 64 | 76 | 140 |
| NHAAC | 61 | 74 | 135 |
| IAC | 54 | 58 | 112 |
| AA | 37 | 55 | 92 |
| NHAA | 36 | 55 | 91 |
| NHIAC | 41 | 38 | 79 |
| IA | 28 | 28 | 56 |
| NHIA | 19 | 15 | 34 |
| HIAC | 13 | 20 | 33 |
| HTOM | 13 | 17 | 30 |
| HIA | 9 | 13 | 22 |
| HBAC | 9 | 10 | 19 |
| NAC | 1 | 8 | 9 |
| NHNAC | 1 | 7 | 8 |
| HAAC | 3 | 2 | 5 |
| HBA | 2 | 2 | 4 |
| NA | 0 | 3 | 3 |
| NHNA | 0 | 2 | 2 |
| HAA | 1 | 0 | 1 |
| HNAC | 0 | 1 | 1 |
| HNA | 0 | 1 | 1 |
• Winnebago County population
43.2 mi, 
64°
• Whiteside County
22.1 mi, 
178°
• Ogle County
31 mi, 
93°
• Clinton County
33.5 mi, 
249°
• Stephenson County
23.4 mi, 
34°
• Green County
44.8 mi, 
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• Lee County
39.1 mi, 
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• Jo Daviess County
24.9 mi, 
323°
• Jackson County
34 mi, 
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• Lafayette County
41.7 mi, 
345°
[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
*Jo Daviess Illinois Notes
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