Last official estimated population of Boone County was 26,276 (year 2014)[1]. This was 0.008% of total US population and 0.8% of total Iowa state population. Area of Boone County is 573.6 mi² (=1485.7 km²), in this year population density was 45.81 p/mi². If population growth rate would be same as in period 2010-2014 (-0.03%/yr), Boone County population in 2024 would be 26,201 [0].
Historical population of Boone 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] +19.13 %/yr
[1860-1870] +13.17 %/yr
[1870-1880] +3.63 %/yr
[1880-1890] +1.33 %/yr
[1890-1900] +1.72 %/yr
[1900-1910] -0.21 %/yr
[1910-1920] +0.79 %/yr
[1920-1930] -0.21 %/yr
[1930-1940] +0.17 %/yr
[1940-1950] -0.57 %/yr
[1950-1960] -0.04 %/yr
[1960-1970] -0.57 %/yr
[1970-1980] -0.11 %/yr
[1980-1990] -0.39 %/yr
[1990-2000] +0.4 %/yr
[2000-2005] +0.22 %/yr
[2005-2010] -0.15 %/yr
[2010-2014] -0.03 %/yr
Looking for settlements in Boone County? Visit this page: Settlements in Boone County, IA
Population of Boone County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 749 | 726 | 1,475 |
| 5 to 9 | 856 | 755 | 1,611 |
| 10 to 14 | 873 | 785 | 1,658 |
| 15 to 19 | 1064 | 770 | 1,834 |
| 20 to 24 | 728 | 727 | 1,455 |
| 25 to 29 | 747 | 753 | 1,500 |
| 30 to 34 | 903 | 806 | 1,709 |
| 35 to 39 | 805 | 778 | 1,583 |
| 40 to 44 | 767 | 758 | 1,525 |
| 45 to 49 | 854 | 792 | 1,646 |
| 50 to 54 | 958 | 1023 | 1,981 |
| 55 to 59 | 1037 | 1047 | 2,084 |
| 60 to 64 | 979 | 906 | 1,885 |
| 65 to 69 | 664 | 684 | 1,348 |
| 70 to 74 | 464 | 534 | 998 |
| 75 to 79 | 384 | 412 | 796 |
| 80 to 84 | 264 | 360 | 624 |
| 85+ | 213 | 508 | 721 |
Boone 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 | 12996 | 12876 | 25,872 |
| NH | 12974 | 12822 | 25,796 |
| WA | 12857 | 12734 | 25,591 |
| NHWAC | 12689 | 12589 | 25,278 |
| NHWA | 12562 | 12456 | 25,018 |
| H | 335 | 302 | 637 |
| HWAC | 307 | 287 | 594 |
| HWA | 295 | 278 | 573 |
| BAC | 256 | 198 | 454 |
| NHBAC | 246 | 190 | 436 |
| BA | 186 | 120 | 306 |
| NHBA | 182 | 118 | 300 |
| TOM | 144 | 154 | 298 |
| NHTOM | 132 | 142 | 274 |
| AAC | 89 | 124 | 213 |
| NHAAC | 82 | 119 | 201 |
| IAC | 114 | 85 | 199 |
| NHIAC | 92 | 71 | 163 |
| AA | 53 | 76 | 129 |
| NHAA | 48 | 75 | 123 |
| IA | 67 | 39 | 106 |
| NHIA | 50 | 30 | 80 |
| HIAC | 22 | 14 | 36 |
| HIA | 17 | 9 | 26 |
| HTOM | 12 | 12 | 24 |
| HBAC | 10 | 8 | 18 |
| NAC | 7 | 10 | 17 |
| NHNAC | 5 | 8 | 13 |
| HAAC | 7 | 5 | 12 |
| HAA | 5 | 1 | 6 |
| HBA | 4 | 2 | 6 |
| HNAC | 2 | 2 | 4 |
| NA | 2 | 1 | 3 |
| HNA | 2 | 0 | 2 |
| NHNA | 0 | 1 | 1 |
• Polk County population
31 mi, 
142°
• Story County
24.2 mi, 
90°
• Dallas County
25 mi, 
192°
• Webster County
29.9 mi, 
336°
• Carroll County
47.7 mi, 
270°
• Hardin County
43.1 mi, 
55°
• Hamilton County
27 mi, 
25°
• Guthrie County
38 mi, 
229°
• Calhoun County
43.4 mi, 
303°
• Greene County
23.1 mi, 270°
[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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