Last official estimated population of Butler County was 184,047 (year 2014)[1]. This was 0.058% of total US population and 1.4% of total Pennsylvania state population. Area of Butler County is 794.8 mi² (=2058.4 km²), in this year population density was 231.58 p/mi². If population growth rate would be same as in period 2010-2014 (+0.03%/yr), Butler County population in 2026 would be 184,603 [0].
Historical population of Butler County for period 1800-2014 [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
[1800-1810] +6.49 %/yr
[1810-1820] +3.33 %/yr
[1820-1830] +3.65 %/yr
[1830-1840] +4.38 %/yr
[1840-1850] +3.09 %/yr
[1850-1860] +1.61 %/yr
[1860-1870] +0.25 %/yr
[1870-1880] +3.71 %/yr
[1880-1890] +0.52 %/yr
[1890-1900] +0.29 %/yr
[1900-1910] +2.47 %/yr
[1910-1920] +0.61 %/yr
[1920-1930] +0.41 %/yr
[1930-1940] +0.85 %/yr
[1940-1950] +1.06 %/yr
[1950-1960] +1.65 %/yr
[1960-1970] +1.1 %/yr
[1970-1980] +1.46 %/yr
[1980-1990] +0.27 %/yr
[1990-2000] +1.37 %/yr
[2000-2005] +0.61 %/yr
[2005-2010] +0.48 %/yr
[2010-2014] +0.03 %/yr
Looking for settlements in Butler County? Visit this page: Settlements in Butler County, PA
Population of Butler County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 4679 | 4546 | 9,225 |
| 5 to 9 | 5369 | 5180 | 10,549 |
| 10 to 14 | 5841 | 5652 | 11,493 |
| 15 to 19 | 6712 | 6324 | 13,036 |
| 20 to 24 | 5487 | 5335 | 10,822 |
| 25 to 29 | 5339 | 5093 | 10,432 |
| 30 to 34 | 5255 | 4999 | 10,254 |
| 35 to 39 | 5193 | 5187 | 10,380 |
| 40 to 44 | 6035 | 6017 | 12,052 |
| 45 to 49 | 6818 | 6965 | 13,783 |
| 50 to 54 | 7462 | 7491 | 14,953 |
| 55 to 59 | 7463 | 7363 | 14,826 |
| 60 to 64 | 6270 | 6301 | 12,571 |
| 65 to 69 | 4804 | 5116 | 9,920 |
| 70 to 74 | 3386 | 3830 | 7,216 |
| 75 to 79 | 2338 | 2981 | 5,319 |
| 80 to 84 | 1688 | 2478 | 4,166 |
| 85+ | 1629 | 3317 | 4,946 |
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 |
| NH | 90491 | 92949 | 183,440 |
| WAC | 89171 | 91772 | 180,943 |
| WA | 88263 | 90888 | 179,151 |
| NHWAC | 87995 | 90657 | 178,652 |
| NHWA | 87142 | 89820 | 176,962 |
| BAC | 1869 | 1392 | 3,261 |
| NHBAC | 1782 | 1308 | 3,090 |
| AAC | 1274 | 1521 | 2,795 |
| NHAAC | 1258 | 1499 | 2,757 |
| H | 1277 | 1226 | 2,503 |
| BA | 1421 | 945 | 2,366 |
| HWAC | 1176 | 1115 | 2,291 |
| NHBA | 1369 | 894 | 2,263 |
| AA | 973 | 1224 | 2,197 |
| HWA | 1121 | 1068 | 2,189 |
| NHAA | 963 | 1207 | 2,170 |
| TOM | 958 | 947 | 1,905 |
| NHTOM | 900 | 894 | 1,794 |
| IAC | 374 | 411 | 785 |
| NHIAC | 324 | 357 | 681 |
| IA | 117 | 142 | 259 |
| NHIA | 88 | 107 | 195 |
| HBAC | 87 | 84 | 171 |
| NAC | 64 | 62 | 126 |
| HTOM | 58 | 53 | 111 |
| NHNAC | 55 | 53 | 108 |
| HIAC | 50 | 54 | 104 |
| HBA | 52 | 51 | 103 |
| NA | 36 | 29 | 65 |
| HIA | 29 | 35 | 64 |
| NHNA | 29 | 27 | 56 |
| HAAC | 16 | 22 | 38 |
| HAA | 10 | 17 | 27 |
| HNAC | 9 | 9 | 18 |
| HNA | 7 | 2 | 9 |
• Allegheny County population
30.9 mi, 
185°
• Mahoning County
44.9 mi, 
278°
• Beaver County
27.6 mi, 
234°
• Mercer County
31.8 mi, 
326°
• Columbiana County
46 mi, 
257°
• Lawrence County
22.4 mi, 284°
• Armstrong County
24.8 mi, 
106°
• Venango County
34.8 mi, 
14°
• Clarion County
32.6 mi, 
52°
• Hancock County
43.8 mi, 231°
[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
*Allegheny Pennsylvania Notes
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