Last official estimated population of Butler County was 65,918 (year 2014)[1]. This was 0.021% of total US population and 2.3% of total Kansas state population. Area of Butler County is 1,446.5 mi² (=3746.5 km²), in this year population density was 45.57 p/mi². If population growth rate would be same as in period 2010-2014 (+0.01%/yr), Butler County population in 2026 would be 66,032 [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] +21.39 %/yr
[1870-1880] +19.87 %/yr
[1880-1890] +2.61 %/yr
[1890-1900] -0.29 %/yr
[1900-1910] -0.13 %/yr
[1910-1920] +6.64 %/yr
[1920-1930] -1.98 %/yr
[1930-1940] -1.14 %/yr
[1940-1950] -0.32 %/yr
[1950-1960] +2.16 %/yr
[1960-1970] +0.07 %/yr
[1970-1980] +1.48 %/yr
[1980-1990] +1.22 %/yr
[1990-2000] +1.63 %/yr
[2000-2005] +1.02 %/yr
[2005-2010] +1.04 %/yr
[2010-2014] +0.01 %/yr
Looking for settlements in Butler County? Visit this page: Settlements in Butler County, KS
Population of Butler County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 2006 | 1936 | 3,942 |
| 5 to 9 | 2383 | 2373 | 4,756 |
| 10 to 14 | 2688 | 2544 | 5,232 |
| 15 to 19 | 2667 | 2508 | 5,175 |
| 20 to 24 | 2309 | 1843 | 4,152 |
| 25 to 29 | 1970 | 1760 | 3,730 |
| 30 to 34 | 2043 | 1936 | 3,979 |
| 35 to 39 | 2082 | 2021 | 4,103 |
| 40 to 44 | 2020 | 2041 | 4,061 |
| 45 to 49 | 2151 | 2100 | 4,251 |
| 50 to 54 | 2400 | 2467 | 4,867 |
| 55 to 59 | 2464 | 2377 | 4,841 |
| 60 to 64 | 1907 | 1947 | 3,854 |
| 65 to 69 | 1524 | 1468 | 2,992 |
| 70 to 74 | 973 | 1078 | 2,051 |
| 75 to 79 | 717 | 926 | 1,643 |
| 80 to 84 | 511 | 739 | 1,250 |
| 85+ | 443 | 905 | 1,348 |
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 | 31631 | 31824 | 63,455 |
| NH | 31606 | 31639 | 63,245 |
| WA | 30915 | 31089 | 62,004 |
| NHWAC | 30137 | 30618 | 60,755 |
| NHWA | 29493 | 29953 | 59,446 |
| H | 1652 | 1330 | 2,982 |
| HWAC | 1494 | 1206 | 2,700 |
| HWA | 1422 | 1136 | 2,558 |
| BAC | 1203 | 569 | 1,772 |
| NHBAC | 1114 | 516 | 1,630 |
| IAC | 742 | 778 | 1,520 |
| TOM | 741 | 774 | 1,515 |
| NHTOM | 664 | 696 | 1,360 |
| NHIAC | 627 | 672 | 1,299 |
| BA | 958 | 313 | 1,271 |
| NHBA | 898 | 289 | 1,187 |
| AAC | 404 | 547 | 951 |
| NHAAC | 378 | 509 | 887 |
| IA | 351 | 345 | 696 |
| AA | 267 | 409 | 676 |
| NHAA | 250 | 384 | 634 |
| NHIA | 283 | 284 | 567 |
| HIAC | 115 | 106 | 221 |
| HTOM | 77 | 78 | 155 |
| HBAC | 89 | 53 | 142 |
| HIA | 68 | 61 | 129 |
| NAC | 45 | 59 | 104 |
| NHNAC | 35 | 52 | 87 |
| HBA | 60 | 24 | 84 |
| NA | 26 | 39 | 65 |
| HAAC | 26 | 38 | 64 |
| NHNA | 18 | 33 | 51 |
| HAA | 17 | 25 | 42 |
| HNAC | 10 | 7 | 17 |
| HNA | 8 | 6 | 14 |
• Sedgwick County population
34.6 mi,
259°
• Cowley County
37.2 mi,
179°
• Harvey County
37.8 mi,
300°
• Sumner County
51.6 mi,
224°
• Marion County
43 mi,
340°
• Greenwood County
33.4 mi,
77°
• Chautauqua County
53.8 mi,
142°
• Woodson County
59.5 mi,
82°
• Elk County
39.2 mi,
124°
• Chase County
38.7 mi,
20°
[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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