Last official estimated population of Washington County was 21,696 (year 2014)[1]. This was 0.007% of total US population and 0.7% of total Iowa state population. Area of Washington County is 570.9 mi² (=1478.7 km²), in this year population density was 38.00 p/mi². If population growth rate would be same as in period 2010-2014 (-0.01%/yr), Washington County population in 2024 would be 21,676 [0].
Historical population of Washington County for period 1840-2014 [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
[1840-1850] +12.01 %/yr
[1850-1860] +11.13 %/yr
[1860-1870] +2.9 %/yr
[1870-1880] +0.73 %/yr
[1880-1890] -0.98 %/yr
[1890-1900] +1.16 %/yr
[1900-1910] -0.39 %/yr
[1910-1920] +0.25 %/yr
[1920-1930] -0.3 %/yr
[1930-1940] +0.12 %/yr
[1940-1950] -0.25 %/yr
[1950-1960] -0.08 %/yr
[1960-1970] -0.23 %/yr
[1970-1980] +0.6 %/yr
[1980-1990] -0.27 %/yr
[1990-2000] +0.53 %/yr
[2000-2005] +0.64 %/yr
[2005-2010] +0.33 %/yr
[2010-2014] -0.01 %/yr
Looking for settlements in Washington County? Visit this page: Settlements in Washington County, IA
Population of Washington County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 755 | 703 | 1,458 |
| 5 to 9 | 739 | 750 | 1,489 |
| 10 to 14 | 845 | 743 | 1,588 |
| 15 to 19 | 701 | 721 | 1,422 |
| 20 to 24 | 626 | 551 | 1,177 |
| 25 to 29 | 536 | 568 | 1,104 |
| 30 to 34 | 637 | 638 | 1,275 |
| 35 to 39 | 616 | 616 | 1,232 |
| 40 to 44 | 594 | 626 | 1,220 |
| 45 to 49 | 716 | 717 | 1,433 |
| 50 to 54 | 800 | 797 | 1,597 |
| 55 to 59 | 785 | 777 | 1,562 |
| 60 to 64 | 702 | 732 | 1,434 |
| 65 to 69 | 595 | 606 | 1,201 |
| 70 to 74 | 415 | 456 | 871 |
| 75 to 79 | 339 | 367 | 706 |
| 80 to 84 | 242 | 347 | 589 |
| 85+ | 222 | 490 | 712 |
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 | 10640 | 11009 | 21,649 |
| WA | 10506 | 10887 | 21,393 |
| NH | 10226 | 10608 | 20,834 |
| NHWAC | 10035 | 10430 | 20,465 |
| NHWA | 9919 | 10326 | 20,245 |
| H | 639 | 597 | 1,236 |
| HWAC | 605 | 579 | 1,184 |
| HWA | 587 | 561 | 1,148 |
| BAC | 197 | 137 | 334 |
| NHBAC | 174 | 124 | 298 |
| TOM | 138 | 129 | 267 |
| NHTOM | 119 | 110 | 229 |
| BA | 125 | 82 | 207 |
| NHBA | 111 | 74 | 185 |
| AAC | 74 | 101 | 175 |
| NHAAC | 68 | 98 | 166 |
| IAC | 81 | 83 | 164 |
| NHIAC | 60 | 64 | 124 |
| AA | 43 | 74 | 117 |
| NHAA | 41 | 74 | 115 |
| IA | 41 | 27 | 68 |
| NHIA | 26 | 19 | 45 |
| HIAC | 21 | 19 | 40 |
| HTOM | 19 | 19 | 38 |
| HBAC | 23 | 13 | 36 |
| NAC | 17 | 12 | 29 |
| HIA | 15 | 8 | 23 |
| HBA | 14 | 8 | 22 |
| NHNAC | 13 | 9 | 22 |
| NA | 12 | 6 | 18 |
| NHNA | 10 | 5 | 15 |
| HAAC | 6 | 3 | 9 |
| HNAC | 4 | 3 | 7 |
| HNA | 2 | 1 | 3 |
| HAA | 2 | 0 | 2 |
• Johnson County population
24.5 mi, 
16°
• Muscatine County
33.2 mi, 
71°
• Des Moines County
40 mi, 
135°
• Wapello County
41.1 mi, 
239°
• Henry County
25.5 mi, 
158°
• Jefferson County
25.6 mi, 
209°
• Iowa County
30 mi, 
324°
• Louisa County
25.5 mi, 
107°
• Keokuk County
23 mi, 
270°
• Van Buren County
41.5 mi, 
196°
[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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