Last official estimated population of Jefferson County was 45,228 (year 2014)[1]. This was 0.014% of total US population and 0.4% of total Pennsylvania state population. Area of Jefferson County is 656.8 mi² (=1701.1 km²), in this year population density was 68.86 p/mi². If population growth rate would be same as in period 2010-2014 (+0.02%/yr), Jefferson County population in 2025 would be 45,305 [0].
Historical population of Jefferson County for period 1810-2014 [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
[1810-1820] +13.3 %/yr
[1820-1830] +13.7 %/yr
[1830-1840] +13.61 %/yr
[1840-1850] +6.42 %/yr
[1850-1860] +3.06 %/yr
[1860-1870] +1.71 %/yr
[1870-1880] +2.58 %/yr
[1880-1890] +4.65 %/yr
[1890-1900] +3 %/yr
[1900-1910] +0.65 %/yr
[1910-1920] -0.16 %/yr
[1920-1930] -1.74 %/yr
[1930-1940] +0.37 %/yr
[1940-1950] -0.95 %/yr
[1950-1960] -0.49 %/yr
[1960-1970] -0.68 %/yr
[1970-1980] +1.01 %/yr
[1980-1990] -0.47 %/yr
[1990-2000] -0.04 %/yr
[2000-2005] -0.25 %/yr
[2005-2010] -0.07 %/yr
[2010-2014] +0.02 %/yr
Looking for settlements in Jefferson County? Visit this page: Settlements in Jefferson County, PA
Population of Jefferson County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1350 | 1216 | 2,566 |
| 5 to 9 | 1306 | 1241 | 2,547 |
| 10 to 14 | 1387 | 1306 | 2,693 |
| 15 to 19 | 1359 | 1313 | 2,672 |
| 20 to 24 | 1304 | 1246 | 2,550 |
| 25 to 29 | 1305 | 1163 | 2,468 |
| 30 to 34 | 1264 | 1229 | 2,493 |
| 35 to 39 | 1196 | 1129 | 2,325 |
| 40 to 44 | 1352 | 1317 | 2,669 |
| 45 to 49 | 1475 | 1468 | 2,943 |
| 50 to 54 | 1697 | 1648 | 3,345 |
| 55 to 59 | 1817 | 1791 | 3,608 |
| 60 to 64 | 1519 | 1567 | 3,086 |
| 65 to 69 | 1267 | 1249 | 2,516 |
| 70 to 74 | 942 | 1061 | 2,003 |
| 75 to 79 | 744 | 897 | 1,641 |
| 80 to 84 | 494 | 720 | 1,214 |
| 85+ | 430 | 869 | 1,299 |
Jefferson 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 | 22030 | 22254 | 44,284 |
| WAC | 21962 | 22197 | 44,159 |
| NHWAC | 21815 | 22050 | 43,865 |
| WA | 21764 | 21995 | 43,759 |
| NHWA | 21625 | 21857 | 43,482 |
| TOM | 209 | 210 | 419 |
| BAC | 211 | 192 | 403 |
| NHTOM | 201 | 201 | 402 |
| NHBAC | 196 | 182 | 378 |
| H | 178 | 176 | 354 |
| IAC | 151 | 150 | 301 |
| HWAC | 147 | 147 | 294 |
| HWA | 139 | 138 | 277 |
| NHIAC | 129 | 126 | 255 |
| BA | 125 | 104 | 229 |
| NHBA | 113 | 96 | 209 |
| AAC | 83 | 94 | 177 |
| NHAAC | 81 | 91 | 172 |
| AA | 46 | 71 | 117 |
| NHAA | 45 | 69 | 114 |
| IA | 63 | 48 | 111 |
| NHIA | 45 | 29 | 74 |
| HIAC | 22 | 24 | 46 |
| HIA | 18 | 19 | 37 |
| HBAC | 15 | 10 | 25 |
| NAC | 14 | 10 | 24 |
| NHNAC | 14 | 9 | 23 |
| HBA | 12 | 8 | 20 |
| HTOM | 8 | 9 | 17 |
| HAAC | 2 | 3 | 5 |
| NA | 1 | 2 | 3 |
| NHNA | 1 | 2 | 3 |
| HAA | 1 | 2 | 3 |
| HNAC | 0 | 1 | 1 |
| HNA | 0 | 0 | 0 |
• Butler County population
49.7 mi, 
251°
• Cambria County
46.2 mi, 
159°
• Indiana County
33.8 mi, 
186°
• Clearfield County
29.6 mi, 
108°
• Armstrong County
32.6 mi, 
226°
• Venango County
42.6 mi, 
295°
• Clarion County
21.6 mi, 
281°
• Elk County
27.3 mi, 
42°
• Forest County
28.7 mi, 
334°
• Cameron County
47.1 mi, 
63°
[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 16 Pennsylvania Notes
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