Last official estimated population of Washington County was 5,789 (year 2014)[1]. This was 0.002% of total US population and 0.2% of total Kansas state population. Area of Washington County is 898.7 mi² (=2327.6 km²), in this year population density was 6.44 p/mi². If population growth rate would be same as in period 2010-2014 (-0.04%/yr), Washington County population in 2026 would be 5,759 [0].
Historical population of Washington County for period 1860-2014 [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
[1860-1870] +26.69 %/yr
[1870-1880] +13.83 %/yr
[1880-1890] +4.38 %/yr
[1890-1900] -0.41 %/yr
[1900-1910] -0.82 %/yr
[1910-1920] -1.17 %/yr
[1920-1930] -0.5 %/yr
[1930-1940] -0.72 %/yr
[1940-1950] -2.02 %/yr
[1950-1960] -1.88 %/yr
[1960-1970] -1.48 %/yr
[1970-1980] -0.79 %/yr
[1980-1990] -1.87 %/yr
[1990-2000] -0.91 %/yr
[2000-2005] -1.39 %/yr
[2005-2010] -0.75 %/yr
[2010-2014] -0.04 %/yr
Looking for settlements in Washington County? Visit this page: Settlements in Washington County, KS
Population of Washington County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 165 | 145 | 310 |
| 5 to 9 | 175 | 172 | 347 |
| 10 to 14 | 184 | 167 | 351 |
| 15 to 19 | 205 | 169 | 374 |
| 20 to 24 | 160 | 127 | 287 |
| 25 to 29 | 116 | 111 | 227 |
| 30 to 34 | 170 | 150 | 320 |
| 35 to 39 | 144 | 121 | 265 |
| 40 to 44 | 145 | 132 | 277 |
| 45 to 49 | 157 | 155 | 312 |
| 50 to 54 | 224 | 205 | 429 |
| 55 to 59 | 208 | 211 | 419 |
| 60 to 64 | 181 | 179 | 360 |
| 65 to 69 | 176 | 159 | 335 |
| 70 to 74 | 137 | 159 | 296 |
| 75 to 79 | 100 | 134 | 234 |
| 80 to 84 | 79 | 133 | 212 |
| 85+ | 96 | 147 | 243 |
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 | 2777 | 2726 | 5,503 |
| WA | 2753 | 2697 | 5,450 |
| NH | 2717 | 2689 | 5,406 |
| NHWAC | 2686 | 2648 | 5,334 |
| NHWA | 2664 | 2621 | 5,285 |
| H | 105 | 87 | 192 |
| HWAC | 91 | 78 | 169 |
| HWA | 89 | 76 | 165 |
| IAC | 30 | 30 | 60 |
| TOM | 25 | 33 | 58 |
| BAC | 29 | 27 | 56 |
| NHTOM | 23 | 31 | 54 |
| NHBAC | 26 | 25 | 51 |
| NHIAC | 19 | 22 | 41 |
| AAC | 12 | 24 | 36 |
| BA | 18 | 17 | 35 |
| NHAAC | 11 | 24 | 35 |
| NHBA | 16 | 17 | 33 |
| IA | 16 | 12 | 28 |
| NHAA | 9 | 16 | 25 |
| AA | 9 | 16 | 25 |
| HIAC | 11 | 8 | 19 |
| HIA | 11 | 8 | 19 |
| NHIA | 5 | 4 | 9 |
| HBAC | 3 | 2 | 5 |
| NAC | 2 | 2 | 4 |
| HTOM | 2 | 2 | 4 |
| HBA | 2 | 0 | 2 |
| HNAC | 1 | 1 | 2 |
| NA | 1 | 1 | 2 |
| NHNAC | 1 | 1 | 2 |
| HNA | 1 | 1 | 2 |
| HAAC | 1 | 0 | 1 |
| NHNA | 0 | 0 | 0 |
| HAA | 0 | 0 | 0 |
• Riley County population
38.9 mi, 
149°
• Gage County
39.6 mi, 
33°
• Pottawatomie County
48.7 mi, 
124°
• Saline County
51.2 mi, 
357°
• Marshall County
30.5 mi, 
89°
• Cloud County
35.3 mi, 
235°
• Clay County
30.1 mi, 
187°
• Jefferson County
27.7 mi, 
354°
• Thayer County
38.2 mi, 
315°
• Republic County
29.7 mi, 
276°
[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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