Last official estimated population of Clarion County was 39,935 (year 2014)[1]. This was 0.013% of total US population and 0.3% of total Pennsylvania state population. Area of Clarion County is 609.8 mi² (=1579.5 km²), in this year population density was 65.48 p/mi². If population growth rate would be same as in period 2010-2014 (-0.03%/yr), Clarion County population in 2026 would be 39,776 [0].
Historical population of Clarion 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] +0.59 %/yr
[1860-1870] +0.6 %/yr
[1870-1880] +4.27 %/yr
[1880-1890] -0.91 %/yr
[1890-1900] -0.71 %/yr
[1900-1910] +0.67 %/yr
[1910-1920] -0.13 %/yr
[1920-1930] -0.46 %/yr
[1930-1940] +1.07 %/yr
[1940-1950] -0.02 %/yr
[1950-1960] -0.25 %/yr
[1960-1970] +0.27 %/yr
[1970-1980] +1.22 %/yr
[1980-1990] -0.39 %/yr
[1990-2000] +0.01 %/yr
[2000-2005] -0.62 %/yr
[2005-2010] -0.23 %/yr
[2010-2014] -0.03 %/yr
Looking for settlements in Clarion County? Visit this page: Settlements in Clarion County, PA
Population of Clarion County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1030 | 923 | 1,953 |
| 5 to 9 | 1011 | 1004 | 2,015 |
| 10 to 14 | 1000 | 1029 | 2,029 |
| 15 to 19 | 1369 | 1469 | 2,838 |
| 20 to 24 | 1917 | 2167 | 4,084 |
| 25 to 29 | 1169 | 1071 | 2,240 |
| 30 to 34 | 986 | 949 | 1,935 |
| 35 to 39 | 917 | 928 | 1,845 |
| 40 to 44 | 1129 | 1155 | 2,284 |
| 45 to 49 | 1187 | 1211 | 2,398 |
| 50 to 54 | 1419 | 1319 | 2,738 |
| 55 to 59 | 1397 | 1440 | 2,837 |
| 60 to 64 | 1325 | 1318 | 2,643 |
| 65 to 69 | 1004 | 1093 | 2,097 |
| 70 to 74 | 779 | 932 | 1,711 |
| 75 to 79 | 584 | 751 | 1,335 |
| 80 to 84 | 388 | 558 | 946 |
| 85+ | 345 | 548 | 893 |
Clarion 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 | 18799 | 19733 | 38,532 |
| WAC | 18531 | 19463 | 37,994 |
| NHWAC | 18403 | 19347 | 37,750 |
| WA | 18384 | 19277 | 37,661 |
| NHWA | 18264 | 19170 | 37,434 |
| BAC | 344 | 281 | 625 |
| NHBAC | 327 | 264 | 591 |
| BA | 258 | 175 | 433 |
| NHBA | 249 | 166 | 415 |
| AAC | 146 | 220 | 366 |
| NHAAC | 144 | 220 | 364 |
| TOM | 159 | 201 | 360 |
| NHTOM | 151 | 192 | 343 |
| H | 157 | 132 | 289 |
| AA | 106 | 175 | 281 |
| NHAA | 105 | 175 | 280 |
| HWAC | 128 | 116 | 244 |
| HWA | 120 | 107 | 227 |
| IAC | 90 | 94 | 184 |
| NHIAC | 72 | 86 | 158 |
| IA | 42 | 35 | 77 |
| NHIA | 26 | 29 | 55 |
| HBAC | 17 | 17 | 34 |
| HIAC | 18 | 8 | 26 |
| NAC | 12 | 13 | 25 |
| HIA | 16 | 6 | 22 |
| NHNAC | 9 | 12 | 21 |
| HBA | 9 | 9 | 18 |
| HTOM | 8 | 9 | 17 |
| NA | 7 | 2 | 9 |
| NHNA | 4 | 1 | 5 |
| HNAC | 3 | 1 | 4 |
| HNA | 3 | 1 | 4 |
| HAAC | 2 | 0 | 2 |
| HAA | 1 | 0 | 1 |
• Butler County population
32.6 mi,
232°
• Mercer County
43.8 mi,
279°
• Indiana County
41.6 mi,
155°
• Crawford County
49.1 mi,
313°
• Armstrong County
26.8 mi,
184°
• Venango County
22.3 mi,
309°
• Jefferson County
21.6 mi,
101°
• Warren County
44.9 mi,
7°
• Elk County
42.8 mi,
68°
• Forest County
23.5 mi,
22°
[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 9 Pennsylvania Notes
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