Last official estimated population of Washington County was 25,164 (year 2014)[1]. This was 0.008% of total US population and 0.4% of total Missouri state population. Area of Washington County is 762.5 mi² (=1974.8 km²), in this year population density was 33.00 p/mi². If population growth rate would be same as in period 2010-2014 (-0.03%/yr), Washington County population in 2024 would be 25,087 [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] +9.37 %/yr
[1830-1840] +0.62 %/yr
[1840-1850] +2.02 %/yr
[1850-1860] +0.99 %/yr
[1860-1870] +1.88 %/yr
[1870-1880] +0.96 %/yr
[1880-1890] +0.2 %/yr
[1890-1900] +0.81 %/yr
[1900-1910] -0.64 %/yr
[1910-1920] +0.31 %/yr
[1920-1930] +0.46 %/yr
[1930-1940] +1.93 %/yr
[1940-1950] -1.73 %/yr
[1950-1960] -0.24 %/yr
[1960-1970] +0.5 %/yr
[1970-1980] +1.77 %/yr
[1980-1990] +1.26 %/yr
[1990-2000] +1.36 %/yr
[2000-2005] +0.75 %/yr
[2005-2010] +0.8 %/yr
[2010-2014] -0.03 %/yr
Looking for settlements in Washington County? Visit this page: Settlements in Washington County, MO
Population of Washington County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 791 | 675 | 1,466 |
| 5 to 9 | 818 | 826 | 1,644 |
| 10 to 14 | 868 | 825 | 1,693 |
| 15 to 19 | 765 | 717 | 1,482 |
| 20 to 24 | 772 | 691 | 1,463 |
| 25 to 29 | 827 | 694 | 1,521 |
| 30 to 34 | 817 | 710 | 1,527 |
| 35 to 39 | 817 | 719 | 1,536 |
| 40 to 44 | 903 | 800 | 1,703 |
| 45 to 49 | 958 | 784 | 1,742 |
| 50 to 54 | 1037 | 936 | 1,973 |
| 55 to 59 | 987 | 920 | 1,907 |
| 60 to 64 | 751 | 811 | 1,562 |
| 65 to 69 | 660 | 681 | 1,341 |
| 70 to 74 | 497 | 536 | 1,033 |
| 75 to 79 | 349 | 346 | 695 |
| 80 to 84 | 196 | 264 | 460 |
| 85+ | 138 | 191 | 329 |
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 | 12759 | 12002 | 24,761 |
| WAC | 12323 | 11939 | 24,262 |
| NHWAC | 12141 | 11820 | 23,961 |
| WA | 12134 | 11791 | 23,925 |
| NHWA | 11983 | 11688 | 23,671 |
| BAC | 603 | 124 | 727 |
| NHBAC | 588 | 117 | 705 |
| BA | 531 | 77 | 608 |
| NHBA | 528 | 77 | 605 |
| TOM | 198 | 152 | 350 |
| IAC | 164 | 161 | 325 |
| H | 192 | 124 | 316 |
| HWAC | 182 | 119 | 301 |
| NHTOM | 166 | 135 | 301 |
| NHIAC | 142 | 147 | 289 |
| HWA | 151 | 103 | 254 |
| IA | 52 | 65 | 117 |
| AAC | 54 | 55 | 109 |
| NHIA | 47 | 62 | 109 |
| NHAAC | 50 | 54 | 104 |
| AA | 32 | 38 | 70 |
| NHAA | 32 | 38 | 70 |
| HTOM | 32 | 17 | 49 |
| HIAC | 22 | 14 | 36 |
| HBAC | 15 | 7 | 22 |
| NAC | 9 | 4 | 13 |
| NHNAC | 8 | 3 | 11 |
| HIA | 5 | 3 | 8 |
| NA | 4 | 3 | 7 |
| HAAC | 4 | 1 | 5 |
| NHNA | 3 | 2 | 5 |
| HBA | 3 | 0 | 3 |
| HNAC | 1 | 1 | 2 |
| HNA | 1 | 1 | 2 |
| HAA | 0 | 0 | 0 |
• Jefferson County population
29 mi, 
41°
• Franklin County
33.6 mi, 
343°
• St. Francois County
24.8 mi, 
111°
• Monroe County
45.4 mi, 
59°
• Crawford County
22.8 mi, 
274°
• Ste. Genevieve County
40.3 mi, 
95°
• Dent County
40 mi, 
234°
• Madison County
44.3 mi, 
137°
• Iron County
24.4 mi, 
153°
• Reynolds County
40.4 mi, 
185°
[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 7 Missouri Notes
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