Last official estimated population of Armstrong County was 68,822 (year 2014)[1]. This was 0.022% of total US population and 0.5% of total Pennsylvania state population. Area of Armstrong County is 663.8 mi² (=1719.3 km²), in this year population density was 103.67 p/mi². If population growth rate would be same as in period 2010-2014 (-0.04%/yr), Armstrong County population in 2024 would be 68,525 [0].
Historical population of Armstrong 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] +9.86 %/yr
[1810-1820] +5.33 %/yr
[1820-1830] +5.54 %/yr
[1830-1840] +4.83 %/yr
[1840-1850] +0.41 %/yr
[1850-1860] +1.93 %/yr
[1860-1870] +1.94 %/yr
[1870-1880] +0.94 %/yr
[1880-1890] -0.19 %/yr
[1890-1900] +1.18 %/yr
[1900-1910] +2.59 %/yr
[1910-1920] +1.08 %/yr
[1920-1930] +0.48 %/yr
[1930-1940] +0.22 %/yr
[1940-1950] -0.03 %/yr
[1950-1960] -0.16 %/yr
[1960-1970] -0.51 %/yr
[1970-1980] +0.28 %/yr
[1980-1990] -0.57 %/yr
[1990-2000] -0.16 %/yr
[2000-2005] -0.49 %/yr
[2005-2010] -0.48 %/yr
[2010-2014] -0.04 %/yr
Looking for settlements in Armstrong County? Visit this page: Settlements in Armstrong County, PA
Population of Armstrong County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1748 | 1653 | 3,401 |
| 5 to 9 | 1876 | 1802 | 3,678 |
| 10 to 14 | 1903 | 1872 | 3,775 |
| 15 to 19 | 2023 | 1798 | 3,821 |
| 20 to 24 | 1856 | 1802 | 3,658 |
| 25 to 29 | 1829 | 1634 | 3,463 |
| 30 to 34 | 1760 | 1832 | 3,592 |
| 35 to 39 | 1889 | 1884 | 3,773 |
| 40 to 44 | 2086 | 2057 | 4,143 |
| 45 to 49 | 2381 | 2339 | 4,720 |
| 50 to 54 | 2776 | 2688 | 5,464 |
| 55 to 59 | 2955 | 2794 | 5,749 |
| 60 to 64 | 2471 | 2434 | 4,905 |
| 65 to 69 | 2049 | 2149 | 4,198 |
| 70 to 74 | 1469 | 1697 | 3,166 |
| 75 to 79 | 1075 | 1392 | 2,467 |
| 80 to 84 | 728 | 1081 | 1,809 |
| 85+ | 715 | 1288 | 2,003 |
Armstrong 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 | 33367 | 33935 | 67,302 |
| WAC | 33117 | 33761 | 66,878 |
| NHWAC | 32916 | 33529 | 66,445 |
| WA | 32841 | 33494 | 66,335 |
| NHWA | 32659 | 33280 | 65,939 |
| BAC | 515 | 415 | 930 |
| NHBAC | 493 | 395 | 888 |
| BA | 351 | 260 | 611 |
| NHBA | 344 | 251 | 595 |
| TOM | 291 | 280 | 571 |
| NHTOM | 270 | 262 | 532 |
| H | 222 | 261 | 483 |
| HWAC | 201 | 232 | 433 |
| HWA | 182 | 214 | 396 |
| AAC | 118 | 169 | 287 |
| NHAAC | 113 | 159 | 272 |
| IAC | 120 | 119 | 239 |
| NHIAC | 108 | 102 | 210 |
| AA | 62 | 121 | 183 |
| NHAA | 60 | 113 | 173 |
| IA | 40 | 35 | 75 |
| NHIA | 31 | 24 | 55 |
| HBAC | 22 | 20 | 42 |
| HTOM | 21 | 18 | 39 |
| NAC | 13 | 16 | 29 |
| HIAC | 12 | 17 | 29 |
| NHNAC | 10 | 15 | 25 |
| HIA | 9 | 11 | 20 |
| HBA | 7 | 9 | 16 |
| HAAC | 5 | 10 | 15 |
| NA | 4 | 6 | 10 |
| HAA | 2 | 8 | 10 |
| NHNA | 3 | 5 | 8 |
| HNAC | 3 | 1 | 4 |
| HNA | 1 | 1 | 2 |
• Allegheny County population
36 mi, 
228°
• Westmoreland County
34.6 mi, 
180°
• Butler County
24.8 mi, 
286°
• Beaver County
47.2 mi, 
259°
• Cambria County
44.7 mi, 
117°
• Lawrence County
47.1 mi, 285°
• Indiana County
22.6 mi, 119°
• Venango County
43.4 mi, 
339°
• Jefferson County
32.6 mi, 
46°
• Clarion County
26.8 mi, 
4°
[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
See note 1 Pennsylvania Notes
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