Last official estimated population of Washington County was 4,805 (year 2014)[1]. This was 0.002% of total US population and 0.1% of total Colorado state population. Area of Washington County is 2,524.0 mi² (=6537 km²), in this year population density was 1.90 p/mi². If population growth rate would be same as in period 2010-2014 (-0.05%/yr), Washington County population in 2026 would be 4,778 [0].
Historical population of Washington County for period 1890-2014 [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
[1890-1900] -5.99 %/yr
[1900-1910] +17.07 %/yr
[1910-1920] +6.44 %/yr
[1920-1930] -1.55 %/yr
[1930-1940] -1.39 %/yr
[1940-1950] -1.02 %/yr
[1950-1960] -1.26 %/yr
[1960-1970] -1.75 %/yr
[1970-1980] -0.45 %/yr
[1980-1990] -0.97 %/yr
[1990-2000] +0.23 %/yr
[2000-2005] -0.04 %/yr
[2005-2010] -0.4 %/yr
[2010-2014] -0.05 %/yr
Looking for settlements in Washington County? Visit this page: Settlements in Washington County, CO
Population of Washington County by age groups male (M) and female (F)[1b]
| Age Gr. | (M) | (F) | Total |
| 0 to 4 | 133 | 111 | 244 |
| 5 to 9 | 161 | 139 | 300 |
| 10 to 14 | 159 | 168 | 327 |
| 15 to 19 | 148 | 129 | 277 |
| 20 to 24 | 157 | 128 | 285 |
| 25 to 29 | 130 | 109 | 239 |
| 30 to 34 | 157 | 133 | 290 |
| 35 to 39 | 123 | 105 | 228 |
| 40 to 44 | 128 | 104 | 232 |
| 45 to 49 | 156 | 134 | 290 |
| 50 to 54 | 193 | 156 | 349 |
| 55 to 59 | 173 | 211 | 384 |
| 60 to 64 | 179 | 160 | 339 |
| 65 to 69 | 137 | 123 | 260 |
| 70 to 74 | 123 | 134 | 257 |
| 75 to 79 | 89 | 80 | 169 |
| 80 to 84 | 55 | 74 | 129 |
| 85+ | 59 | 122 | 181 |
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 | 2407 | 2289 | 4,696 |
| WA | 2383 | 2255 | 4,638 |
| NH | 2201 | 2125 | 4,326 |
| NHWAC | 2154 | 2101 | 4,255 |
| NHWA | 2135 | 2073 | 4,208 |
| H | 259 | 195 | 454 |
| HWAC | 253 | 188 | 441 |
| HWA | 248 | 182 | 430 |
| TOM | 28 | 38 | 66 |
| BAC | 39 | 20 | 59 |
| NHTOM | 22 | 32 | 54 |
| NHBAC | 38 | 15 | 53 |
| IAC | 21 | 26 | 47 |
| NHIAC | 17 | 25 | 42 |
| BA | 30 | 9 | 39 |
| NHBA | 30 | 8 | 38 |
| AAC | 16 | 18 | 34 |
| NHAAC | 10 | 15 | 25 |
| AA | 10 | 8 | 18 |
| IA | 7 | 6 | 13 |
| NHAA | 7 | 6 | 13 |
| NHIA | 6 | 6 | 12 |
| HTOM | 6 | 6 | 12 |
| NAC | 5 | 5 | 10 |
| HAAC | 6 | 3 | 9 |
| NA | 2 | 4 | 6 |
| HBAC | 1 | 5 | 6 |
| HIAC | 4 | 1 | 5 |
| NHNAC | 4 | 1 | 5 |
| HAA | 3 | 2 | 5 |
| HNAC | 1 | 4 | 5 |
| HNA | 1 | 4 | 5 |
| NHNA | 1 | 0 | 1 |
| HIA | 1 | 0 | 1 |
| HBA | 0 | 1 | 1 |
• Arapahoe County population
63.6 mi, 
249°
• Adams County
59.8 mi, 
263°
• Weld County
74.5 mi, 
303°
• Morgan County
37.9 mi, 302°
• Elbert County
66.2 mi, 
226°
• Logan County
53 mi, 
6°
• Yuma County
41.7 mi, 
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• Kit Carson County
55.9 mi, 
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• Lincoln County
69 mi, 
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• Phillips County
63 mi, 
46°
[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
*Weld Colorado Notes
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