Last official estimated population of Washington County was 28,290 (year 2014)[1]. This was 0.009% of total US population and 0.4% of total Indiana state population. Area of Washington County is 516.6 mi² (=1338 km²), in this year population density was 54.76 p/mi². If population growth rate would be same as in period 2010-2014 (+0.02%/yr), Washington County population in 2024 would be 28,360 [0].
Historical population of Washington County for period 1820-2014 [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
[1820-1830] +3.75 %/yr
[1830-1840] +1.57 %/yr
[1840-1850] +1.1 %/yr
[1850-1860] +0.5 %/yr
[1860-1870] +0.32 %/yr
[1870-1880] +0.25 %/yr
[1880-1890] -0.18 %/yr
[1890-1900] +0.42 %/yr
[1900-1910] -1.06 %/yr
[1910-1920] -0.47 %/yr
[1920-1930] -0.22 %/yr
[1930-1940] +0.44 %/yr
[1940-1950] -0.29 %/yr
[1950-1960] +0.76 %/yr
[1960-1970] +0.79 %/yr
[1970-1980] +1.3 %/yr
[1980-1990] +0.79 %/yr
[1990-2000] +1.38 %/yr
[2000-2005] +0.5 %/yr
[2005-2010] +0.26 %/yr
[2010-2014] +0.02 %/yr
Looking for settlements in Washington County? Visit this page: Settlements in Washington County, IN
Population of Washington County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 808 | 781 | 1,589 |
| 5 to 9 | 883 | 856 | 1,739 |
| 10 to 14 | 1047 | 979 | 2,026 |
| 15 to 19 | 990 | 907 | 1,897 |
| 20 to 24 | 826 | 777 | 1,603 |
| 25 to 29 | 768 | 755 | 1,523 |
| 30 to 34 | 804 | 801 | 1,605 |
| 35 to 39 | 873 | 839 | 1,712 |
| 40 to 44 | 946 | 885 | 1,831 |
| 45 to 49 | 1000 | 991 | 1,991 |
| 50 to 54 | 1081 | 1113 | 2,194 |
| 55 to 59 | 1030 | 1083 | 2,113 |
| 60 to 64 | 884 | 867 | 1,751 |
| 65 to 69 | 677 | 804 | 1,481 |
| 70 to 74 | 551 | 564 | 1,115 |
| 75 to 79 | 350 | 387 | 737 |
| 80 to 84 | 211 | 295 | 506 |
| 85+ | 169 | 296 | 465 |
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 |
| WAC | 13762 | 13835 | 27,597 |
| NH | 13691 | 13799 | 27,490 |
| WA | 13639 | 13720 | 27,359 |
| NHWAC | 13567 | 13666 | 27,233 |
| NHWA | 13455 | 13563 | 27,018 |
| H | 207 | 181 | 388 |
| HWAC | 195 | 169 | 364 |
| HWA | 184 | 157 | 341 |
| TOM | 125 | 121 | 246 |
| NHTOM | 114 | 108 | 222 |
| BAC | 118 | 93 | 211 |
| NHBAC | 113 | 84 | 197 |
| IAC | 94 | 94 | 188 |
| NHIAC | 77 | 79 | 156 |
| AAC | 52 | 80 | 132 |
| NHAAC | 51 | 79 | 130 |
| BA | 68 | 49 | 117 |
| NHBA | 68 | 46 | 114 |
| AA | 33 | 54 | 87 |
| NHAA | 32 | 54 | 86 |
| IA | 32 | 35 | 67 |
| NHIA | 21 | 27 | 48 |
| HIAC | 17 | 15 | 32 |
| HTOM | 11 | 13 | 24 |
| HIA | 11 | 8 | 19 |
| HBAC | 5 | 9 | 14 |
| NAC | 1 | 4 | 5 |
| NHNAC | 1 | 4 | 5 |
| HBA | 0 | 3 | 3 |
| NA | 1 | 1 | 2 |
| NHNA | 1 | 1 | 2 |
| HAAC | 1 | 1 | 2 |
| HAA | 1 | 0 | 1 |
| HNAC | 0 | 0 | 0 |
| HNA | 0 | 0 | 0 |
• Jefferson County population
37.3 mi, 
139°
• Clark County
22.9 mi, 
111°
• Floyd County
22.2 mi, 
151°
• Lawrence County
26.4 mi, 
308°
• Jackson County
21.8 mi, 
8°
• Harrison County
28.6 mi, 
179°
• Jennings County
37.5 mi, 
43°
• Scott County
19.8 mi, 
74°
• Orange County
21.1 mi, 
259°
• Crawford County
28.2 mi, 
220°
[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
*Harrison, Clark Indiana Notes
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