Last official estimated population of Jefferson County was 69,613 (year 2014)[1]. This was 0.022% of total US population and 0.6% of total Ohio state population. Area of Jefferson County is 411.0 mi² (=1064.4 km²), in this year population density was 169.39 p/mi². If population growth rate would be same as in period 2010-2014 (-0.03%/yr), Jefferson County population in 2026 would be 69,326 [0].
Historical population of Jefferson 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] +7.01 %/yr
[1810-1820] +0.71 %/yr
[1820-1830] +1.95 %/yr
[1830-1840] +1.08 %/yr
[1840-1850] +1.53 %/yr
[1850-1860] -1.09 %/yr
[1860-1870] +1.12 %/yr
[1870-1880] +1.24 %/yr
[1880-1890] +1.79 %/yr
[1890-1900] +1.19 %/yr
[1900-1910] +3.96 %/yr
[1910-1920] +1.72 %/yr
[1920-1930] +1.3 %/yr
[1930-1940] +1.06 %/yr
[1940-1950] -0.17 %/yr
[1950-1960] +0.28 %/yr
[1960-1970] -0.31 %/yr
[1970-1980] -0.49 %/yr
[1980-1990] -1.3 %/yr
[1990-2000] -0.83 %/yr
[2000-2005] -0.72 %/yr
[2005-2010] -0.44 %/yr
[2010-2014] -0.03 %/yr
Looking for settlements in Jefferson County? Visit this page: Settlements in Jefferson County, OH
Population of Jefferson County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1747 | 1516 | 3,263 |
| 5 to 9 | 1805 | 1773 | 3,578 |
| 10 to 14 | 1968 | 1889 | 3,857 |
| 15 to 19 | 2213 | 2262 | 4,475 |
| 20 to 24 | 2213 | 2430 | 4,643 |
| 25 to 29 | 1797 | 1838 | 3,635 |
| 30 to 34 | 1775 | 1676 | 3,451 |
| 35 to 39 | 1678 | 1739 | 3,417 |
| 40 to 44 | 2058 | 2087 | 4,145 |
| 45 to 49 | 2094 | 2106 | 4,200 |
| 50 to 54 | 2452 | 2616 | 5,068 |
| 55 to 59 | 2691 | 2844 | 5,535 |
| 60 to 64 | 2577 | 2626 | 5,203 |
| 65 to 69 | 2015 | 2148 | 4,163 |
| 70 to 74 | 1382 | 1654 | 3,036 |
| 75 to 79 | 1126 | 1361 | 2,487 |
| 80 to 84 | 655 | 1118 | 1,773 |
| 85+ | 592 | 1173 | 1,765 |
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 | 32428 | 34351 | 66,779 |
| WAC | 30732 | 32713 | 63,445 |
| NHWAC | 30357 | 32264 | 62,621 |
| WA | 30106 | 32092 | 62,198 |
| NHWA | 29761 | 31672 | 61,433 |
| BAC | 2314 | 2299 | 4,613 |
| NHBAC | 2265 | 2251 | 4,516 |
| BA | 1879 | 1875 | 3,754 |
| NHBA | 1854 | 1843 | 3,697 |
| TOM | 658 | 653 | 1,311 |
| NHTOM | 624 | 623 | 1,247 |
| H | 410 | 505 | 915 |
| HWAC | 375 | 449 | 824 |
| HWA | 345 | 420 | 765 |
| IAC | 231 | 236 | 467 |
| AAC | 215 | 250 | 465 |
| NHAAC | 211 | 245 | 456 |
| NHIAC | 213 | 203 | 416 |
| AA | 129 | 164 | 293 |
| NHAA | 127 | 160 | 287 |
| IA | 57 | 64 | 121 |
| NHIA | 54 | 46 | 100 |
| HBAC | 49 | 48 | 97 |
| NAC | 32 | 33 | 65 |
| HTOM | 34 | 30 | 64 |
| NHNAC | 30 | 32 | 62 |
| HBA | 25 | 32 | 57 |
| HIAC | 18 | 33 | 51 |
| HIA | 3 | 18 | 21 |
| NA | 9 | 8 | 17 |
| NHNA | 8 | 7 | 15 |
| HAAC | 4 | 5 | 9 |
| HAA | 2 | 4 | 6 |
| HNAC | 2 | 1 | 3 |
| HNA | 1 | 1 | 2 |
• Washington County population
30.3 mi, 
117°
• Beaver County
29.3 mi, 
47°
• Columbiana County
25.6 mi, 
358°
• Tuscarawas County
37.4 mi, 
275°
• Belmont County
28.5 mi, 
202°
• Ohio County
22.1 mi, 
160°
• Hancock County
13 mi, 51°
• Carroll County
21.2 mi, 
305°
• Brooke County
13.1 mi, 
131°
• Harrison County
18.8 mi, 
246°
[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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