Last official estimated population of Washington County was 61,691 (year 2014)[1]. This was 0.019% of total US population and 0.5% of total Ohio state population. Area of Washington County is 640.0 mi² (=1657.6 km²), in this year population density was 96.39 p/mi². If population growth rate would be same as in period 2010-2014 (-0.04%/yr), Washington County population in 2024 would be 61,474 [0].
Historical population of Washington 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] +0.99 %/yr
[1810-1820] +5.7 %/yr
[1820-1830] +1.19 %/yr
[1830-1840] +5.91 %/yr
[1840-1850] +3.56 %/yr
[1850-1860] +2.07 %/yr
[1860-1870] +1.14 %/yr
[1870-1880] +0.63 %/yr
[1880-1890] -0.2 %/yr
[1890-1900] +1.3 %/yr
[1900-1910] -0.6 %/yr
[1910-1920] -0.54 %/yr
[1920-1930] -0.14 %/yr
[1930-1940] +0.26 %/yr
[1940-1950] +0.2 %/yr
[1950-1960] +1.53 %/yr
[1960-1970] +1.01 %/yr
[1970-1980] +1.18 %/yr
[1980-1990] -0.32 %/yr
[1990-2000] +0.16 %/yr
[2000-2005] -0.22 %/yr
[2005-2010] -0.25 %/yr
[2010-2014] -0.04 %/yr
Looking for settlements in Washington County? Visit this page: Settlements in Washington County, OH
Population of Washington County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 1605 | 1481 | 3,086 |
| 5 to 9 | 1678 | 1623 | 3,301 |
| 10 to 14 | 1892 | 1774 | 3,666 |
| 15 to 19 | 1988 | 1895 | 3,883 |
| 20 to 24 | 1982 | 1976 | 3,958 |
| 25 to 29 | 1639 | 1606 | 3,245 |
| 30 to 34 | 1711 | 1724 | 3,435 |
| 35 to 39 | 1614 | 1656 | 3,270 |
| 40 to 44 | 1778 | 1931 | 3,709 |
| 45 to 49 | 1965 | 1946 | 3,911 |
| 50 to 54 | 2234 | 2375 | 4,609 |
| 55 to 59 | 2450 | 2474 | 4,924 |
| 60 to 64 | 2183 | 2245 | 4,428 |
| 65 to 69 | 1783 | 1922 | 3,705 |
| 70 to 74 | 1365 | 1569 | 2,934 |
| 75 to 79 | 1024 | 1158 | 2,182 |
| 80 to 84 | 624 | 866 | 1,490 |
| 85+ | 517 | 960 | 1,477 |
Washington 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 | 29727 | 30831 | 60,558 |
| WAC | 29276 | 30494 | 59,770 |
| NHWAC | 28992 | 30176 | 59,168 |
| WA | 28831 | 30059 | 58,890 |
| NHWA | 28564 | 29756 | 58,320 |
| BAC | 650 | 535 | 1,185 |
| NHBAC | 633 | 508 | 1,141 |
| TOM | 478 | 469 | 947 |
| NHTOM | 460 | 453 | 913 |
| BA | 443 | 316 | 759 |
| NHBA | 434 | 298 | 732 |
| H | 305 | 350 | 655 |
| AAC | 279 | 338 | 617 |
| NHAAC | 276 | 336 | 612 |
| IAC | 305 | 304 | 609 |
| HWAC | 284 | 318 | 602 |
| NHIAC | 289 | 288 | 577 |
| HWA | 267 | 303 | 570 |
| AA | 190 | 250 | 440 |
| NHAA | 189 | 249 | 438 |
| IA | 82 | 77 | 159 |
| NHIA | 75 | 69 | 144 |
| NAC | 24 | 21 | 45 |
| HBAC | 17 | 27 | 44 |
| NHNAC | 19 | 17 | 36 |
| HTOM | 18 | 16 | 34 |
| HIAC | 16 | 16 | 32 |
| HBA | 9 | 18 | 27 |
| NA | 8 | 10 | 18 |
| HIA | 7 | 8 | 15 |
| NHNA | 5 | 6 | 11 |
| HNAC | 5 | 4 | 9 |
| HNA | 3 | 4 | 7 |
| HAAC | 3 | 2 | 5 |
| HAA | 1 | 1 | 2 |
• Wood County population
16.6 mi, 
184°
• Athens County
30.7 mi, 
254°
• Meigs County
38.1 mi, 
229°
• Morgan County
23.1 mi, 
301°
• Noble County
22 mi, 
5°
• Monroe County
28.6 mi, 
48°
• Ritchie County
29.5 mi, 
129°
• Tyler County
32.7 mi, 
88°
• Pleasants County
18.5 mi, 
107°
• Wirt County
30.3 mi, 
169°
[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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