Last official estimated population of Butler County was 14,902 (year 2014)[1]. This was 0.005% of total US population and 0.5% of total Iowa state population. Area of Butler County is 581.8 mi² (=1506.7 km²), in this year population density was 25.62 p/mi². If population growth rate would be same as in period 2010-2014 (+0.06%/yr), Butler County population in 2026 would be 15,007 [0].
Historical population of Butler 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] +10.33 %/yr
[1870-1880] +3.69 %/yr
[1880-1890] +0.79 %/yr
[1890-1900] +1.51 %/yr
[1900-1910] -0.48 %/yr
[1910-1920] +0.42 %/yr
[1920-1930] -0.13 %/yr
[1930-1940] +0.21 %/yr
[1940-1950] -0.33 %/yr
[1950-1960] +0.04 %/yr
[1960-1970] -0.3 %/yr
[1970-1980] +0.41 %/yr
[1980-1990] -1.15 %/yr
[1990-2000] -0.27 %/yr
[2000-2005] -0.45 %/yr
[2005-2010] -0.13 %/yr
[2010-2014] +0.06 %/yr
Looking for settlements in Butler County? Visit this page: Settlements in Butler County, IA
Population of Butler County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 448 | 468 | 916 |
| 5 to 9 | 541 | 521 | 1,062 |
| 10 to 14 | 530 | 470 | 1,000 |
| 15 to 19 | 454 | 411 | 865 |
| 20 to 24 | 350 | 346 | 696 |
| 25 to 29 | 318 | 342 | 660 |
| 30 to 34 | 452 | 460 | 912 |
| 35 to 39 | 432 | 382 | 814 |
| 40 to 44 | 415 | 402 | 817 |
| 45 to 49 | 441 | 481 | 922 |
| 50 to 54 | 498 | 490 | 988 |
| 55 to 59 | 580 | 551 | 1,131 |
| 60 to 64 | 541 | 524 | 1,065 |
| 65 to 69 | 450 | 454 | 904 |
| 70 to 74 | 338 | 364 | 702 |
| 75 to 79 | 240 | 300 | 540 |
| 80 to 84 | 182 | 261 | 443 |
| 85+ | 212 | 357 | 569 |
Butler 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 | 7354 | 7509 | 14,863 |
| NH | 7342 | 7500 | 14,842 |
| WA | 7283 | 7443 | 14,726 |
| NHWAC | 7280 | 7430 | 14,710 |
| NHWA | 7210 | 7366 | 14,576 |
| H | 80 | 84 | 164 |
| HWAC | 74 | 79 | 153 |
| HWA | 73 | 77 | 150 |
| TOM | 73 | 69 | 142 |
| NHTOM | 72 | 67 | 139 |
| BAC | 67 | 52 | 119 |
| NHBAC | 63 | 51 | 114 |
| AAC | 44 | 59 | 103 |
| NHAAC | 44 | 57 | 101 |
| AA | 22 | 44 | 66 |
| NHAA | 22 | 43 | 65 |
| IAC | 32 | 30 | 62 |
| NHIAC | 29 | 26 | 55 |
| BA | 35 | 15 | 50 |
| NHBA | 32 | 14 | 46 |
| IA | 8 | 12 | 20 |
| NHIA | 5 | 9 | 14 |
| HIAC | 3 | 4 | 7 |
| NAC | 1 | 6 | 7 |
| NHNAC | 1 | 6 | 7 |
| HIA | 3 | 3 | 6 |
| HBAC | 4 | 1 | 5 |
| HBA | 3 | 1 | 4 |
| HTOM | 1 | 2 | 3 |
| NA | 1 | 1 | 2 |
| NHNA | 1 | 1 | 2 |
| HAAC | 0 | 2 | 2 |
| HAA | 0 | 1 | 1 |
| HNAC | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
• Black Hawk County population
30.1 mi, 
127°
• Cerro Gordo County
33.5 mi, 
314°
• Bremer County
23.2 mi, 
82°
• Tama County
47.3 mi, 
164°
• Hardin County
33.4 mi, 
224°
• Floyd County
22 mi, 
359°
• Grundy County
22.9 mi, 
181°
• Chickasaw County
32.5 mi, 
46°
• Mitchell County
42.4 mi, 359°
• Franklin County
24.9 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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